JP2016067627A5 - - Google Patents

Description

Absorbent articles

  The present invention relates to an absorbent article having a stretchable region in which a pattern is formed by shrinkage wrinkles.

  In absorbent articles, such as decorative patterns (including pictures and one-point characters), usage instructions, usage assistance, size indications, etc., or manufacturer, product name, characteristic indications, etc. A display is added (see, for example, Patent Document 1).

  Conventionally, as a method for adding these indications, printing has been mainly used, and in addition to printing on a member originally provided in the absorbent article, it is common to paste a printed sheet on the absorbent article. It is the target. As another technique, so-called embossing is also used.

  However, these conventional methods have a problem that when applied to the expansion / contraction region, the display is greatly collapsed due to expansion / contraction, and is not suitable for the expansion / contraction region. Another problem is that a high-grade appearance like underwear for adults cannot be obtained.

JP 2007-061440 A JP-T-2004-532758

  Therefore, a main object of the present invention is to provide a novel display addition method suitable for the stretchable region.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In an absorbent article having a stretchable region that is stretchable in at least one direction,
The stretchable region is formed by laminating an elastic sheet layer between the first sheet layer and the second sheet layer,
In a state where the elastic sheet layer is stretched in the stretching direction along the surface thereof, the first sheet layer and the second sheet layer are arranged in large numbers with a space in the stretching direction and a direction perpendicular thereto. It is joined directly or indirectly at
In the natural length state of the elastic sheet layer, the first sheet layer and the second sheet layer are formed with shrinkage ridges extending in a direction intersecting the expansion / contraction direction between the dotted joints,
A ground pattern region formed by a portion where the dotted joint is regularly repeated;
In the ground pattern region, the non-joined portion without the point-like joint portion, the sparse pattern portion in which the point-like joint portion is regularly repeated in a sparse arrangement than the ground pattern region, and the point-like joint portion are A display area in which at least one of dense pattern portions regularly repeated in a denser arrangement than the ground pattern area is formed in a display shape;
An absorbent article comprising:

(Function and effect)
In the present invention, the shrinkage wrinkles are formed so that the first sheet layer and the second sheet layer between the dotted joints are separated from each other, and the dotted joints are regularly repeated particularly in the ground pattern region. As a result, regular shrinkage wrinkles are formed. In the display area, shrinkage wrinkles are continuously formed in the non-joined portion, and this is displayed. As a result, the display rises with the regular shrinkage of the ground pattern area as the background. The appearance of this display is based on the expansion / contraction principle of the expansion / contraction area, so the display deforms due to expansion / contraction, but unlike the contraction / deformation of the printed sheet or embossing, it becomes a deformation like a scale change and the design It wo n’t change. In addition, such a design using shrinkage wrinkles comes to have a high-grade appearance like a lace pattern. In addition, in the ground pattern region and the display region, there is an advantage that the continuity of the elastic sheet layer in the expansion / contraction direction is not interrupted, and the elasticity is maintained as a whole.

<Invention of Claim 2>
A main display portion in which the non-joined portion is formed in a display shape in the display region, and a dense pattern portion in which the dotted joint portion is regularly repeated in a denser arrangement than the ground pattern region is the main display portion. The absorbent article according to claim 1, further comprising a contour display portion formed along the contour.

(Function and effect)
When the contour display part by the dense pattern part is provided in this way, the space between the dotted joints becomes narrower than that of the ground pattern area in the dense pattern part, and the concave part due to a small shrinkage fold (a part where the exterior body is thin) Is formed along the outline of the display, so that the display appears more clearly and has a quaint appearance.

<Invention of Claim 3>
The sparse pattern portion and the dense pattern portion are formed by at least one of an area of individual point-like joint portions and an interval between the point-like joint portions being different from a ground pattern region. Absorbent article.

(Function and effect)
In this way, by making at least one of the area of the individual point joints and the interval between the point joints different, the density of the point joints can be formed.

<Invention of Claim 4>
The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
The stretch region is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the stretch direction is the width direction.
The absorptive article according to any one of claims 1 to 3.

(Function and effect)
Thus, the present invention is suitable for the stretchable region of the exterior body of the pants-type disposable diaper.

<Invention of Claim 5>
The dense pattern portion is provided in at least one of the iliac facing portion, the abdominal facing portion, and the buttocks facing portion in the stretchable region;
At least a region excluding a dense pattern portion and a waist portion in the waist portion is the ground pattern region.
The absorbent article according to claim 4.

(Function and effect)
In the pants type disposable diaper, the iliac facing portion, the abdominal facing portion, and the buttocks facing portion of the exterior body have a large protrusion and bulge on the body surface. Therefore, when providing the above-mentioned dense pattern portion, it is desirable to arrange as described in this section.

<Invention of Claim 6>
The absorptive article according to claim 4 or 5 with which said dense pattern part was provided in a part or all of a part which overlaps with said absorber in said elastic region.

(Function and effect)
The region overlapping the absorbent body in the pants-type disposable diaper is a region where it is desirable to dispose the elastic sheet layer for manufacturing reasons, but does not require expansion and contraction. Therefore, it is desirable to provide a dense pattern portion in such a region to reduce shrinkage wrinkles, that is, to reduce the amount of shrinkage.

<Invention of Claim 7>
The first sheet layer and the second sheet layer are joined through the through-hole formed in the elastic sheet layer at the point joint, and at least the first sheet layer and the second sheet layer in the point joint. The absorbent article according to any one of claims 1 to 6, wherein the absorbent article is not joined to the elastic sheet layer except in a sheet layer.

(Function and effect)
With such a structure, a gap is formed between the through hole of the elastic sheet layer and the dotted joint, and even if the material of the elastic sheet layer is a non-porous film or sheet, the gap allows air permeability. Is preferable.

  As described above, according to the present invention, there are advantages such as the addition of a design that is suitable for the stretchable region and has a high-class feeling.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. (A) is a principal part top view of an exterior body, (b) is DD sectional drawing of (a), (c) is sectional drawing in a mounting state, (d) is sectional drawing in a natural length state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows only the principal part of the underpants type disposable diaper of an unfolded state. It is a principal part enlarged plan view of an exterior body. It is a principal part enlarged plan view of an exterior body. It is a photograph of a sample attached to a dummy doll. It is the photograph of the principal part of the sample of a natural length state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part enlarged plan view of an exterior body. It is a principal part enlarged plan view of an exterior body. It is sectional drawing which shows roughly the principal part cross section of the exterior body extended to some extent in the width direction.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “elongation rate” means a value when the natural length is 100%. Moreover, the dot pattern part in sectional drawing has shown joining means, such as a hot-melt-adhesive.
1 to 14 show a pants-type disposable diaper. This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an exterior body 20 that forms a front body F and a back body B, and an interior body 10 that is fixed to and integrated with the inner surface of the exterior body 20. The interior body 10 is formed by interposing an absorbent body 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, the inner body 10 and the outer body 20 are bonded to the inner surface (upper surface) of the outer body 20 after the back surface of the inner body 10 is joined by a joining means such as a hot melt adhesive (pattern portion 10B in FIG. 7). Is folded at the center in the longitudinal direction (front-rear direction), which is the boundary between the front body F and the back body B, and both side portions thereof are joined to each other by heat welding or hot melt adhesive to form the side seal portion 21. Thus, a pants-type disposable diaper having a waist opening and a pair of left and right leg openings is formed.

(Structural example of interior body)
As shown in FIGS. 4 to 6, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained. Although the planar shape of the interior body 10 is not particularly limited, it is generally a substantially rectangular shape as illustrated.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. Can be used. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.
The shape of the absorbent body 13 is formed in a substantially hourglass shape having a narrowed portion 13N having a narrower width than the front and rear sides at the crotch portion. Although the size of the constricted portion 13N can be determined as appropriate, the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper. It can be about -60%. In the case where the constricted portion 13N is provided, if the planar shape of the interior body 10 is substantially rectangular, the remainder of the interior body 10 that does not include the absorber 13 in the portion corresponding to the constricted portion 13N of the absorber 13. A part is formed.

  A solid gather BS that fits around the legs is formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather BS includes a fixed portion fixed to a side portion on the back surface of the interior body, and a side portion on the surface of the interior body from the fixed portion to the side of the interior body. The body part that extends to the front, the front and rear ends of the body part in a lying state, and the lying part that is fixed to the side of the surface of the interior body, and the freedom part that is formed with this lying part being unfixed The portion is formed of a gathered nonwoven fabric 15 that is turned into a double sheet by folding.

  Further, between the double sheets, an elongated gather elastic member 16 is disposed at the tip of the free part. The gather elastic member 16 is for forming a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge by elastic stretching force as shown by a two-dot chain line in FIG. 5 in the product state.

  The liquid-impermeable back sheet 12 is folded back on the both sides in the width direction of the absorber 13 together with the liquid-permeable surface sheet 11. As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

As the gathered elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone , polyester, and the like that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. The gathered elastic member 16 may be a tape-like member having a certain width in addition to the thread-like shape shown in the figure.

In the same manner as the liquid-permeable surface sheet 11, the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, silicone , paraffin metal, alkylchromic chloride water repellent, etc. are used to prevent urine transmission and the like, as well as to prevent fogging and to improve skin feel (dry feeling). It is desirable to use a water-repellent non-woven fabric coated with.

(External body structure example)
As shown in FIGS. 4 to 6, the exterior body 20 is provided with an elastic sheet layer and an elongated elastic member along the width direction between the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B. Directional elasticity is imparted. The planar shape of the exterior body 20 has a pseudo hourglass shape as a whole due to the concave leg-around lines 29 formed to form the leg openings on both sides of the middle. The exterior body 20 may be divided into two parts in the front-rear direction so that both are separated at the crotch part.

  More specifically, in the exterior body 20 of the illustrated embodiment, the waist part elasticity is applied to the waist part 23 in the waist part 23 defined as the longitudinal range of the side seal part 21 where the front body F and the back body B are joined. A member 24 is provided. The waist elastic member 24 is a plurality of elongated elastic members such as a plurality of rubber bands arranged at intervals in the vertical direction, and gives an elastic force so as to tighten around the body torso. The waist elastic members 24 are not arranged substantially as a single bundle with a close interval, but with a spacing of about 3 to 8 mm so as to form a predetermined stretch zone, preferably three or more, preferably Five or more are arranged. The stretch rate at the time of fixing the waist elastic member 24 can be determined as appropriate, but can be about 230 to 320% in the case of a normal adult.

  In the illustrated example, thread rubber is used for the waist elastic member 24. However, for example, a tape-like elastic member may be used. Alternatively, an elastic sheet layer described later may be extended to the waist 23. Good. The waist elastic member 24 in the illustrated form is sandwiched between folded portions 20C formed by folding the constituent material of the second sheet layer 20B to the inner surface side at the waist opening edge. You may pinch | interpose between the structural materials of the sheet | seat layer 20B.

The constituent material of the first sheet layer and the second sheet layer can be used without particular limitation as long as it is a sheet, but it is preferable to use a nonwoven fabric from the viewpoint of air permeability and flexibility. 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, the basis weight is preferably about 12 to ²⁰ g / m ² . Further, the first sheet layer 20A and the second sheet layer 20B may be a pair of layers in which a single material is folded and faced.

  Characteristically, as shown in FIG. 2, the stretchable region 20 </ b> X of the present invention is formed in the waist part of the front body F and the back body B and the middle part therebetween. That is, as shown in FIG. 3, the elastic region 20X of the waist portion and the middle portion is formed by laminating the elastic sheet layer 30 between the first sheet layer 20A and the second sheet layer 20B, and is elastic. In a state where the sheet layer 30 is stretched in the width direction, a large number of point-like joint portions 40 in which the first sheet layer 20A and the second sheet layer 20B are arranged at intervals in the expansion / contraction direction and the direction orthogonal thereto. Thus, the first sheet layer 20A and the second sheet layer 20B are joined to each other through the through-hole 31 formed in the elastic sheet layer 30, and at least the first sheet layer 20A and the second sheet layer 20B in the point-like joint portion 40. It is not joined with the elastic sheet layer 30 except between. As a result, as shown in FIG. 3 (d), in the natural length state of the elastic sheet layer 30, the first sheet layer 20A and the second sheet layer 20B between the joints swell in a direction away from each other, A contraction ridge 25 extending in the intersecting direction is formed, and as shown in FIG. 3C, the contraction fold 25 is stretched but remains even in a mounted state where it extends to some extent in the width direction. In addition, as can be seen from FIG. 3C assuming the mounted state and FIGS. 3A and 3B assuming the fully expanded state of the first sheet layer 20A and the second sheet layer 20B, in these states, Even if the material of the elastic sheet layer 30 is a non-porous film or sheet, a gap is formed between the through hole 31 of the dotted joint in the elastic sheet layer 30 and the dotted joint 40. Breathability is added. In addition, the state of the shrinkage wrinkle 25 in the mounted state and the natural length state also appears in the sample photographs of FIGS.

  In addition, as shown in FIGS. 2 and 8 to 11, the stretchable region 20 </ b> X includes a ground pattern region 70 formed by a portion where the dotted joints 40 are regularly repeated, and a ground pattern region 70. The main display part 81 in which the non-joint part 41 without the dotted joint part 40 is formed in a display form (display form) and the dotted joint part 40 are regularly repeated in a denser arrangement than the ground pattern region 70. The dense pattern portion 42 includes a display region 80 having a contour display portion 82 formed along the contour of the main display portion 81.

  In the expansion / contraction region 20X configured in this way, the contraction ridge 25 is formed so that the first sheet layer 20A and the second sheet layer 20B between the dotted joints 40 of FIGS. 3, 10 and 11 are separated from each other. At the same time, especially in the ground pattern region 70, the regular joints 40 are regularly formed to form the regular shrinkage folds 25. In the display area 80, the shrinkage wrinkles 25 are continuously formed in a display shape in the non-joined portion 41, and this becomes the main display portion 81. As a result, the display rises with the regular shrinkage folds 25 in the ground pattern area 70 as the background. In particular, in the illustrated form, the space between the dotted joints 40 is narrower than that of the ground pattern region 70 in the dense pattern portion 42, and a concave portion (a portion where the exterior body 20 is thin) due to the small shrinkage ridge 25 is displayed. Since the main display portion 81 is formed along the contour, the main display portion 81 comes out more clearly and has a tasteful appearance. The appearance of this display uses the expansion / contraction principle of the expansion / contraction region 20X. Therefore, the display deforms due to expansion / contraction, but unlike the contraction / deformation of the print sheet or embossing, it becomes a deformation like a scale change. It will not be a change that collapses. In addition, such a design using the shrinkage wrinkles 25 exhibits a high-grade appearance such as a lace pattern. Moreover, in the ground pattern area 70 and the display area 80, the continuity in the expansion / contraction direction of the elastic sheet layer 30 is not interrupted, and the elasticity is maintained as a whole.

  As can be seen from this principle, the above-described advantageous display can be formed only by providing only the non-joint portion 41 or the dense pattern portion 42 in the ground pattern region 70 in a display form. Although not shown, the display can also be formed by forming a sparse pattern portion in which the dotted joint portions 40 are regularly repeated in a sparse arrangement than the ground pattern region 70 in a display form.

  The non-joined portion 41 provided in the display shape preferably has a longer length in the stretch direction than the pattern region surrounding it, that is, the interval in the stretch direction of the dotted joint portion 40 in the dense pattern portion 42 in the illustrated form. As a result, the display-like shrinkage fold 25 formed by the non-joined portion 41 swells larger than the surroundings, resulting in a clearer display.

  The density of the point-like joints 40 (that is, the ratio of the point-like joints 40 to the unit area) is determined by using at least one of the area of the individual point-like joints 40 and the interval between the point-like joints 40 as the ground pattern region 70. It can be formed by making it different from that. For example, in order to form the dense pattern portion 42, the area of each point-like joint 40 is increased with respect to the ground pattern region 70 by making the distance between the point-like joints 40 the same, or each point-like joint 40. It is possible to reduce the interval between the dotted joint portions 40 by making the area of the portion 40 the same, or to increase the area of each dotted junction portion 40 and reduce the interval between the dotted junction portions 40. To form a sparse pattern, the opposite is true.

The shape of each individual point joint 40 can be an arbitrary shape such as a perfect circle, an ellipse, a polygon such as a triangle, a star, or a cloud. The size of each point joint 40 may be determined as appropriate, but if it is too large, the influence of the hardness of the point joint 40 on the touch will increase, and if it is too small, the joint area is small and the materials are sufficient. Therefore, the major axis or the diameter d1 is preferably about 0.5 to 2.5 mm. In particular, the area of the individual spot joints 40 in the ground pattern region 70 is preferably about 0.4 to 0.9 mm ^2, and the area of the individual spot joints 40 in the dense pattern portion 42 is 0.6. It is preferable to set it to about -1.2 mm < ² >, and it is preferable to set the area of each dotted | punctate junction part 40 in a sparse pattern part to about 0.3-0.6 mm < ² >.

  The planar arrangement of the point-like joint portions 40 in the ground pattern region 70, the dense pattern portion 42, and the sparse pattern portion can be determined as long as it is regularly repeated, and is an orthorhombic lattice shape or a hexagonal lattice shape (these are also called a staggered shape). A square lattice shape, a rectangular lattice shape, a parallel body lattice shape (a configuration in which two groups are arranged so that a large number of parallel oblique rows intersect each other as in the illustrated ground pattern region 70), etc. In addition to those in which the individual dot joints 40 are regularly repeated, the group of the dot joints 40 (group unit arrangement may be regular or irregular, and may be a pattern, character, etc.) It can also be repeated. The arrangement pattern of the point-shaped joints 40 of the ground pattern region 70, the dense pattern portion 42, and the sparse pattern portion may be the same or different from each other. In the illustrated form, the dot-shaped joint portions 40 of the ground pattern region 70 are parallel to each other. The dense pattern portion 42 is arranged in a rhombic lattice pattern (45 degrees zigzag).

  The interval 40x in the expansion / contraction direction (width direction) of the dotted joint 40 in the ground pattern region 70 may be determined as appropriate, but if it is too wide, wrinkles at the time of contraction tend to be irregular, and the difference from the display region 80 can be understood. When it becomes difficult and the hardness is too narrow, the influence of the hardness of the joint 40 on the feeling becomes large. The same applies to the interval 40y in the direction orthogonal to the expansion / contraction direction. Further, the interval in the expansion / contraction direction (width direction) of the dotted joint portion 40 in the dense pattern portion 42 may be determined as appropriate, but if it is too wide, the difference from the ground pattern region 70 becomes difficult to understand, and if it is too narrow, the joint portion 40. Since the influence of the hardness of the material on the feel becomes large, the thickness is preferably about 0.5 to 1.0 mm. Further, the interval in the expansion / contraction direction (width direction) of the dotted joints 40 in the sparse pattern portion may be determined as appropriate, but if it is too wide, the wrinkles at the time of shrinkage tend to be irregular, and if it is too narrow, Therefore, it is preferable that the difference is approximately 6 to 8 mm.

  In order to represent not only the outer shape but also the internal shape of the display formed in the display area 80 as shown in the figure, a shaping dot joint 43 for dividing the non-joint part 41 as shown in the figure is displayed. It is desirable to add to the area 80. The shaping point joint 43 has the same size and shape as the other point joints 40, and is larger than the other point joints 40 according to the display content (for example, the long diameter or the diameter d2 is set to the ground pattern region). 70, or a smaller diameter (for example, the area is 0.6 to 0.8 times that of the spot-like joint 40 in the ground pattern region 70). Or a shape different from that of the other point-like joints 40. It is preferable that the interval 43x in the expansion / contraction direction of the shaping point-like joint portion 43 is approximately the same as the interval 40y in the extension / contraction direction of the other point-like joint portions 40.

  The display in the display area 80 is not particularly limited as long as the display area 80 has a shape different from the shrinkage wrinkles 25 in the ground pattern area 70. A display known in the field of absorbent articles, for example, a decoration pattern (one-point picture) And a function display such as a usage method, a use assistance, and a size, or a mark display such as a manufacturer, a product name, and a characteristic function. In the illustrated embodiment, plant patterns such as flowers and leaves are added, but it goes without saying that various patterns such as abstract patterns, animal patterns, and natural phenomenon patterns can be used.

  The elastic sheet layer 30 is not particularly limited, and may be formed using a plurality of materials. However, the elastic sheet layer 30 itself has elasticity like a film-like elastic sheet made of an elastic film or the like. An elastic material can be suitably used. In addition to a non-porous material, a material in which a large number of holes and slits are formed for ventilation can be used. The thickness of the elastic sheet layer 30 is not particularly limited, but is preferably about 20 to 40 μm.

  The elongation ratio of the stretchable region 20X (the elongation ratio when the elastic sheet layer 30 is integrally stretched between the first sheet layer 20A and the second sheet layer 20B) can be appropriately determined. In this case, the width can be about 170 to 250%. In addition, the expansion ratio in the vertical direction of the stretchable region 20X can be determined as appropriate. For example, in the case of an adult use, the first expansion so as to extend in the vertical direction is about 100 to 125% in a form that hardly extends in the vertical direction. In the case where the elastic sheet layer 30 is extended in the longitudinal direction when the sheet layer 20A and the second sheet layer 20B are joined, it can be about 125 to 180%.

  The first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B may be directly joined to each other at the spot-like joining portion 40 or indirectly through another sheet such as the elastic sheet layer 30. FIG. 15 shows three typical joining structures. In the joining structure shown in FIGS. 15A and 15C, the first sheet layer 20A and the second sheet layer 20B are joined through the through-hole 31 formed in the elastic sheet layer 30 in the same manner as the form shown in FIG. In addition, the elastic sheet layer 30 is not joined except at least between the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B in the point-like joint portion 40 (the portion with the oblique lattice pattern in FIG. 15). This joining structure is merely the pattern of the raised portions of the patterned calender roller in the method of Japanese Patent Application Laid-Open No. 2004-532758, which is the pattern of the dotted joints 40 and 43 of the ground pattern region 70 and the display region 80 described above. But it can be manufactured. However, the method described in Japanese Patent Application Laid-Open No. 2004-532758 is considered to extrude the elastic sheet layer 30 without dissolving it. In that case, as shown in FIG. There is a possibility that the elastic sheet layer 30 does not remain between the second sheet layers 20 </ b> B, and extruded fragments (not shown) remain movably around the through holes 31. On the other hand, in the manufacturing method described in Japanese Patent Application Laid-Open No. 2004-532758, the processing conditions such as the material type and processing temperature of the elastic sheet layer 30 are set so that the elastic sheet layer 30 is dissolved and separated at the dotted joint 40. By selecting as appropriate, as shown in FIG. 15A, it is possible to obtain a joint structure in which the melted and separated pieces of the elastic sheet layer 30 are left in the dotted joints 40. Thus, the form in which the melted and separated pieces of the elastic sheet layer 30 remain between the first sheet layer 20A and the second sheet layer 20B of the spot joint 40 is the first sheet layer 20A and the second sheet 20 in the spot joint 40. Although it can be said that the sheet layer 20B is joined to the elastic sheet layer 30, the first sheet layer 20A and the second sheet layer 20B are at least other than between the first sheet layer 20A and the second sheet layer 20B in the dotted joint 40. Then, the form which is not joined to the elastic sheet layer 30 (the first sheet layer 20A and the second sheet layer 20B of the dotted joint 40 are joined to the surrounding elastic sheet layer 30 (that is, the edge of the through hole 31). Means no). Of course, in the manufacturing method described in Japanese Patent Application Laid-Open No. 2004-532758, the type of material of the elastic sheet layer 30 is not changed so that the elastic sheet layer 30 is not dissolved and separated and the through holes 31 are not formed at the dotted joints 40. By appropriately selecting the processing conditions such as the processing temperature, as shown in FIG. 15 (b), no through-hole is formed in the elastic sheet layer 30 at the dotted joint 40, and the first sheet layer 20 </ b> A and the second sheet are formed. A bonding structure in which the layer 20 </ b> B is indirectly bonded through the elastic sheet layer 30 can also be used.

  The illustrated example is an example in which the present invention is applied to the stretchable region 20X other than the waist part of the exterior body 20. However, the present invention may be applied to the waist part and the waist part and the back part B of the front body F. The expansion / contraction region 20X may not be provided in an intermediate portion between the waist portion of the body. The stretchable region 20X described above is not limited to pants-type disposable diapers, but also to other stretchable parts such as three-dimensional gathers and flat gathers that are generally used for tape-type disposable diapers, fastening tapes, and absorbent articles in general. Can also be applied.

  In the pants-type disposable diaper, the iliac facing portion, the abdominal facing portion, and the buttocks facing portion of the exterior body 20 have a large protrusion and bulge on the body surface. Therefore, as in the example shown in FIGS. 1 to 11, the dense pattern portion 42 described above is provided in the iliac facing portion of the exterior body 20, or is provided in the abdominal facing portion as shown in FIGS. 12 to 14. Although not shown, it is preferable that they are provided in both of them, and the other portions are the ground pattern region 70. Although not shown, a dense pattern portion can also be provided for the buttock facing portion.

  Moreover, although the area | region which overlaps with the absorber 13 in a pants type disposable diaper is desirable to arrange | position the elastic sheet layer 30 for the reason on manufacture, it is an area | region which does not require expansion-contraction. Therefore, as in the illustrated example, the dense pattern portion 42 is provided in the most part (or part or all) of the portion overlapping the absorber 13 in the stretchable region 20X of the exterior body 20, and the shrinkage wrinkles 25 are reduced. It is also a preferable form to reduce the amount of shrinkage.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 mounted on the inner surface of the exterior body 20 and to prevent leakage from the front and rear edges of the interior body 10, 50 and 60 may be provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion of the front body F to the position overlapping the front end portion of the interior body 10. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior body 20 on the inner surface of the diaper can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the presser sheets 50 and 60 described above.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
“Elongation rate” means a value when the natural length is 100%.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

  INDUSTRIAL APPLICABILITY The present invention can be used for absorbent articles in general having stretchable areas such as pants-type disposable diapers as in the above examples, various disposable diapers such as a tape type and a pad type, and sanitary napkins.

  B ... Back body, F ... Front body, 10 ... Interior body, 11 ... Liquid permeable top sheet, 12 ... Liquid impervious back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Gather elastic member, 20 ... exterior body, 20C ... folded portion, 21 ... side seal portion, 24 ... waist elastic member, 29 ... line around leg, 13N ... constricted portion, 20A ... first sheet layer, 20B ... second sheet 30 ... Elastic sheet layer, 40 ... Dot joint, 25 ... Shrinkage, 70 ... Ground pattern area, 41 ... Non-joint part, 42 ... Dense pattern part, 20X ... Stretch area, 80 ... Display area, 81 ... Main display part, 82 ... contour display part, 43 ... dot-shaped joint for shaping.

Claims (7)

In an absorbent article having a stretchable region that is stretchable in at least one direction,
The stretchable region is formed by laminating an elastic sheet layer between the first sheet layer and the second sheet layer,
In a state where the elastic sheet layer is stretched in the stretching direction along the surface thereof, the first sheet layer and the second sheet layer are arranged in large numbers with a space in the stretching direction and a direction perpendicular thereto. It is joined directly or indirectly at
In the natural length state of the elastic sheet layer, the first sheet layer and the second sheet layer are formed with shrinkage ridges extending in a direction intersecting the expansion / contraction direction between the dotted joints,
A ground pattern region formed by a portion where the dotted joint is regularly repeated;
In the ground pattern region, the non-joined portion without the point-like joint portion, the sparse pattern portion in which the point-like joint portion is regularly repeated in a sparse arrangement than the ground pattern region, and the point-like joint portion are A display area in which at least one of dense pattern portions regularly repeated in a denser arrangement than the ground pattern area is formed in a display shape;
An absorbent article comprising:   A main display portion in which the non-joined portion is formed in a display shape in the display region, and a dense pattern portion in which the dotted joint portion is regularly repeated in a denser arrangement than the ground pattern region is the main display portion. The absorbent article according to claim 1, further comprising a contour display portion formed along the contour.   The sparse pattern portion and the dense pattern portion are formed by at least one of an area of individual point-like joint portions and an interval between the point-like joint portions being different from a ground pattern region. Absorbent article. The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
The stretch region is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the stretch direction is the width direction.
The absorptive article according to any one of claims 1 to 3. The dense pattern portion is provided in at least one of the iliac facing portion, the abdominal facing portion, and the buttocks facing portion in the stretchable region;
At least a region excluding a dense pattern portion and a waist portion in the waist portion is the ground pattern region.
The absorbent article according to claim 4.   The absorptive article according to claim 4 or 5 with which said dense pattern part was provided in a part or all of a part which overlaps with said absorber in said elastic region.   The first sheet layer and the second sheet layer are joined through the through-hole formed in the elastic sheet layer at the point joint, and at least the first sheet layer and the second sheet layer in the point joint. The absorbent article according to any one of claims 1 to 6, wherein the absorbent article is not joined to the elastic sheet layer except in a sheet layer.

Images