JP4439425B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article that covers the groin from the crotch, such as a paper diaper and a sanitary napkin.

  Conventionally, in an absorbent article such as a disposable diaper and a sanitary napkin, in order to improve the wearing feeling and prevent leakage, emphasis is placed on fit to the body. Various means for improving the fit have been proposed, but the current mainstream is that the shape of the body surface of the wearing part is made by partially bending or shrinking a flat material with elastic members such as rubber thread. It approaches the three-dimensional shape along.

  However, even if the planar material is forced to deform so that it conforms to the three-dimensional body surface shape with complicated irregularities and curved surfaces, voids due to wrinkles etc. are generated in the part that does not conform to the body surface shape, The part may not follow the movement of the body and may be displaced, or may cause the wearer to feel uncomfortable.

  In particular, the absorber is a continuous planar member having an hourglass shape or a rectangular shape, and has high rigidity compared to other members, so that it is difficult to deform, and in particular, a gap or a sense of incongruity is likely to occur between the body and the tailbone part. There was a problem.

Regarding this problem, Patent Document 1 proposes a technique of inserting a slit-like notch along the front-rear direction at the back end of the absorber, and the fit at the waist side of the crack is improved. There is still room for improvement in other areas.
JP 2004-105723 A

  Then, the main subject of this invention is improving the fit property of the absorber with respect to a coccyx part.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In an absorbent article comprising an absorbent body extending at least from the crotch part to the waist part over the coccyx part,
In the absorbent body, four sides surrounded by a direction from the lumbar part of the coccyx part toward both sides in the width direction of the coccyx part and a direction toward the crotch part from the part of the crotch part of the coccyx part toward the both sides of the crotch part An absorptive article in which a shape part is formed as a pressing crevice or a notch.

(Function and effect)
In the present invention, in the absorbent body, the direction from the lumbar part of the coccyx part toward the both sides in the width direction of the coccyx part, and the direction from the part of the crotch part of the coccyx part toward the crotch part toward the both sides in the width direction It is based on that the quadrilateral part enclosed is formed as a pressing recessed part or a notch part. Such a quadrilateral portion has a shape composed of two sides excluding the bases of two triangles having a common base and different heights. When such a part is formed as a compressed recess or notch, the part along the bisector of the apex angle in the lower triangle rises as seen from the inner surface side, and the waist from the apex in the higher triangle The side part rises when viewed from the inner surface side, and the end part that forms the two sides of the triangle with the lower height approaches the end part that forms the two sides of the triangle with the higher height. Deforms in the closing direction.

  As a result, a bulging portion is formed over substantially the entire crack, that is, over the range from the crotch portion to the lumbar region, and the bulging portion is bent along the protrusion of the coccyx portion. Therefore, according to the present invention, the fit of the absorbent body in the coccyx portion is significantly improved, thereby providing an improved feeling of wearing and leakage prevention performance.

<Invention of Claim 2>
The absorbent article according to claim 1, wherein a slit-like cutout portion or a compressed concave portion is formed in the absorbent body so as to pass through the center in the width direction from the edge of the waist portion to the vicinity of the quadrilateral portion.

(Function and effect)
By having such a slit-like notch or compressed recess in the absorbent body, a clear bulge is formed in the central portion in the width direction from the waist to the coccyx, and the fit at the waist side of the crack is improved. Further improvement can be achieved.

<Invention of Claim 3>
3. The absorbent article according to claim 1, wherein an edge of the waist portion of the absorbent body has arc-shaped portions that swell in a direction away from the crotch side on both sides of the edge in the width direction.

(Function and effect)
By having such an arcuate portion, the edge of the waist easily follows the curve of the body, and a gap is less likely to occur between the edge and the body.

<Invention of Claim 4>
Either the slit-shaped notch part or pressing recessed part which continues to a peripheral edge along the direction away from the center of the width direction, approaching the waist | hip | lumbar part side from the top part of each buttocks is formed in the said absorber, respectively. The absorbent article according to item 1.

(Function and effect)
When such a slit-like notch or compressed recess is formed in the absorber, the two edges of the slit-like notch or compressed recess are deformed so as to be close to each other, and a bulge is formed so as to wrap the collar. It becomes like this. As a result, the fit with respect to the buttocks is significantly improved.

<Invention of Claim 5>
The absorbent article according to any one of claims 1 to 4, wherein an edge of the waist portion of the absorbent body is formed so as to form a substantially continuous arc shape when worn on the body.

(Function and effect)
In the case where there is a deformation due to a slit-shaped notch or the like, the edge of the waist is likely to exhibit a discontinuous bent shape, and such a shape brings a sense of incongruity to the wearer. For this reason, generation | occurrence | production of discomfort is prevented by forming absorptivity previously as this statement.

<Invention of Claim 6>
The absorbent article of any one of Claims 1-5 by which the elastic member is arrange | positioned so that the contraction force of the width direction may act on the said quadrilateral part.

(Function and effect)
As described above, the contraction force by the elastic member acts to promote the above-described deformation of the present invention, and a more remarkable improvement in fit is achieved.

  As described above, according to the present invention, the fitting property of the absorbent body with respect to the heel portion is remarkably improved, and thus the wearing feeling and the leakage prevention performance are improved.

  Hereinafter, an embodiment of the present invention will be described in detail based on an application example in a pants-type disposable paper diaper. However, other types of absorbent articles such as a tape-type disposable paper diaper that is fastened by a tape on both sides and various sanitary napkins. Needless to say, this can also be applied.

  FIG. 1 is a product state external view of a pants-type disposable paper diaper 1 according to the embodiment, and FIG. 2 is an assembled view in a developed state. This pants-type disposable paper diaper 1 (hereinafter also simply referred to as a paper diaper) is provided with an absorbent body 13 such as cotton-like pulp between a liquid-permeable surface sheet 11 made of nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. The absorbent main body 10 is interposed, and the exterior sheet 20 is provided integrally on the outer surface side of the absorbent main body 10. In manufacturing, the absorbent main body 10 and the outer sheet 20 are folded in the front-rear direction after the absorbent main body 10 is bonded and integrated on the upper surface side of the outer sheet 20 with an adhesive such as hot melt, and both side portions thereof Are joined to each other by heat welding or hot melt adhesive, thereby forming a pants-type paper diaper in which a waist opening and a pair of left and right leg openings are formed.

Hereinafter, the absorbent main body 10 and the exterior sheet 20 will be described in this order.
(Absorbent body structure)
As shown in FIGS. 5 and 6, the absorbent main body 10 has an absorbent body 13 such as cotton-like pulp between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. It has an intervening structure and absorbs and retains body fluids.

  As the liquid-permeable surface sheet 11 that covers 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 surface sheet 11 is wound around the side edge of the absorbent body 13 and extends to the back surface side of the absorbent body 13.

  The leak-proof sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene, but in recent years has moisture permeability from the viewpoint of preventing stuffiness. 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. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  The absorber 13 is preferably formed by molding a fluffy pulp and a water-absorbing polymer. The water-absorbing polymer can be mixed in the pulp constituting the absorber, for example, as a granular powder. Pulp includes cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. Softwood pulp with a longer fiber length is more functional and price than hardwood pulp. It can use suitably in terms of. Of course, other known absorbers can also be used. Further, the absorbent body 13 can be wrapped with a liquid-permeable sheet 14 such as crepe paper as necessary for maintaining the shape and improving the diffusibility of the body fluid that has passed through the liquid-permeable surface sheet 11. The shape of the absorber 13 can be a shape in which the width of the crotch portion is narrower than the back side and the abdominal side as shown in the drawing, or a rectangular shape.

  On the other hand, it is preferable that solid gather BSs that fit around the legs are formed on both side portions of the absorbent main body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15, and as the gathered nonwoven fabric, as shown in FIG. The side edge portion of the absorbent body 13 is further rolled up from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the paper diaper, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. In addition, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorbent body 13, and the portion forming the three-dimensional gather BS is defined as It is bonded by a hot melt adhesive or the like while being folded at the part.

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... As shown in FIG. 6 (B), the thread-like elastic stretch members 16, 16... Are for forming a three-dimensional gather BS by raising the nonwoven fabric portion protruding from the absorber side edge portion by elastic stretch force. It is.

  The leak-proof sheet 12 enters the inside of the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gather BS as shown in FIG. As the leak-proof sheet 12, it is desirable to use an opaque sheet so as not to cause browning such as defecation and urine. 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 thread-like elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, 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. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is made of synthetic fibers such as polyethylene or polypropylene, such as olefin, polyester, and amide, as well as recycled 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, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(Structure of exterior sheet 20)
As shown in FIGS. 2 and 3, the exterior sheet 20 is a two-layer nonwoven fabric sheet composed of an upper nonwoven fabric 20A and a lower nonwoven fabric 20B, and various elastic members are arranged between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. It is provided and has elasticity. The planar shape has a pseudo hourglass shape as a whole by the concave leg periphery cut lines 29 formed to form the leg openings on the both sides of the middle.

  In particular, in the exterior sheet 20 of the illustrated embodiment, as elastic members, waist elastic members 24, 24... Arranged around the waist opening 23 in the developed shape shown in FIG. And a plurality of waistline elastic member groups 25, 25... Arranged in the horizontal direction at intervals in the vertical direction, and the waistline elastic member group 25 in each of the front body F and the back body B. , 25... Separately from one side joining edge joining the front body F and the back body B to the crotch side, bypassing the crotch side and reaching the other side joining edge of the front body and the back body, A plurality of curved elastic member groups 26, 28,... Arranged at intervals without crossing each other are provided. In addition, in this exterior sheet | seat 20, what is called a leg periphery elastic member substantially continuous along the leg periphery cut line 29 is not provided.

Hereinafter, each elastic member will be described in detail.
The waist elastic members 24, 24... Are arranged in the vicinity of the waist opening edge in the range of the side joint edges 21 and 22 where the front body F and the back body B are joined, with a space in the vertical direction. A plurality of thread rubber-like elastic members for attaching a disposable diaper to the body by applying an elastic force so as to tighten around the waist of the body. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used.

  The waist elastic member groups 25, 25... Are elastic rubber members arranged in the horizontal direction at intervals in the vertical direction over the range from the upper part to the lower part of the side joint edges 21, 22. This is an elastic member for applying a horizontal expansion / contraction force to the waist portions of the front body F and the back body B, respectively, so that the disposable diaper is in close contact with the body. Note that the boundary between the waist elastic members 24, 24... And the waist elastic members 25, 25. For example, among the elastic members arranged in the horizontal direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, some on the upper side function as waist elastic members. The remaining elastic members only have to function as waist elastic members.

  In the back body B, the dorsal curved elastic member groups 26, 26... Arranged separately from the waist elastic member groups 25, 25... Substantially extend along the leg-cut line 29 from the side joint edge 22 on one side. A plurality of, in the illustrated example, nine that are arranged so as to extend to the crotch portion, bypass the crotch portion, and substantially reach the other side side joint edge 22 along the leg leg cut line 29 on the opposite side. These elastic rubber members are elastic rubber members, and the dorsal curved elastic member groups 26, 26,... Are arranged at intervals without crossing each other. The dorsal curved elastic member groups 26, 26,... Are different in arrangement from the conventional leg-hole elastic members. That is, about two or three elastic expansion and contraction members are not arranged substantially as a bundle with a close interval, but at a predetermined interval so as to form a predetermined expansion and contraction zone, five or more, Preferably seven or more are arranged.

  The start and end of the dorsal curved elastic member groups 26, 26... Are connected at a predetermined interval from the upper part to the lower part of the joining edge of the front body F and the back body B, and the side edges of the absorbent main body 10. Is an arrangement pattern in which the acute angle crossing angle α between the dorsal curved elastic member groups 26, 26... And the side edge of the absorbent main body 10 is 35 ° or more, preferably 40 ° or more, more preferably 45 ° or more. Is arranged in. Incidentally, in the example of illustration, it arrange | positions so that the crossing angle (alpha) may be about 47 degrees. The crossing angle α is preferably 60 ° or less at most from the balance between the horizontal component and the vertical component.

  In the side joint edges 21 and 22 of the front body F and the back body B, the elastic member 26i located closest to the waist opening in the dorsal curved elastic member groups 26, 26. 24... Are arranged so that the distance SB from the lowermost elastic member 24O is within 20 mm. When the wearer grips the side of the waist part and pulls it upward when wearing it, the elastic force of the curved elastic members 26, 26... Makes it easier to pull the rear body B side of the paper diaper upward, improving the ease of wearing. Become.

  Further, it is desirable that the dorsal curved elastic member groups 26, 26,... In the elastic member, when the elastic force acts in the tangential direction, the force acting in the width direction of the absorber 13 can be minimized by reversing the curved shape in the crotch part, and the shrinkage of the absorber 13 in the crotch part can be reduced. It becomes possible to prevent.

  Particularly in the disposable diaper 1 shown in the figure, in the back body B, in order to fit the exterior sheet 20 corresponding to the bulge shape of the buttock, it is relatively loose so that the stretching force acts on the bulge of the buttock as much as possible. The elastic member groups 26, 26,... Are arranged at an inclination angle. For example, if the elastic members 26, 26,... Are arranged at an intersection angle α = 47 °, 73% of the applied elastic force is obtained. It becomes possible to act as a horizontal component force, and the exterior sheet 20 can be brought into close contact with the body so as to wrap the buttocks. As a result, the absorptive main body 10 is not contracted to the center side, and the leak prevention effect is enhanced by securely contacting the absorbent body 10 with the body.

  Further, the arrangement interval of the back-side curved elastic member groups 26, 26. Is substantially the same as the arrangement interval of the dorsal curved elastic member groups 26, 26... In the elastic member arrangement section MB of the crotch part, and is located on the crotch side of the dorsal curved elastic member groups 26, 26. The elastic member 26O is arranged so as to draw a curved shape in which the distance BH from the crotch fold line CL of the diaper is within ± 50 mm, preferably within 35 mm. The spacing between the dorsal curved elastic member groups 26, 26... Is evenly arranged between the side joint edges 21, 22 and the crotch part, so that the entire exterior sheet 20 can be applied to the body with equal balance without concentration of elastic force. When the lines drawn by the dorsal curved elastic member groups 26, 26,... Are arranged in a curved shape of a large wave that bypasses the region near the crotch, the exterior sheet 20 is firmly held against the body. You can get it.

  It is desirable that the dorsal curved elastic member groups 26, 26,... Arranged on the back body B side be biased toward the front body F side with respect to the crotch fold line CL of the diaper. In the crotch part, the back-side curved elastic member groups 26, 26... Are biased toward the front body F side with respect to the crotch part folding line CL of the diaper, thereby eliminating the diaper slipping that occurs on the buttocks side and the exterior sheet 20. It can be made to fit the body without sag.

  On the other hand, in the front body of the exterior sheet 20, the abdomen curved elastic member groups 28, 28... Arranged separately from the waist elastic member groups 25, 25. It extends to the crotch side and reaches the side joint edge 21 on the other side, and is a plurality of, in the illustrated example, nine thread-like elastic members arranged at intervals without intersecting. The side curved elastic member groups 28, 28... Are arranged at intervals without crossing each other. The ventral curved elastic member groups 28, 28... Are also different in arrangement from the conventional leg-hole elastic members. That is, about two or three elastic expansion and contraction members are not arranged substantially as a bundle with a close interval, but at a predetermined interval so as to form a predetermined expansion and contraction zone, five or more, Preferably seven or more are arranged.

  The start and end of the ventral elastic member groups 28, 28... Are also connected at a predetermined interval from the upper part to the lower part of the side part joint edges 21 and 21 of the front body F and the rear body B, and absorbable. In the crossing portion with the side edge of the main body 10, the acute side crossing angle θ between the ventral curved elastic member groups 28, 28... And the side edge of the absorbent main body 10 is 30 ° or less, preferably 28 ° or less. Has been placed. Incidentally, in the example of illustration, it arrange | positions so that crossing angle (theta) may be around 26 degrees. The crossing angle θ is preferably at least 20 ° or more from the balance between the horizontal component force and the vertical component force.

  In the ventral curved elastic member groups 28, 28..., In order to minimize the force acting in the width direction of the absorbent body 13 and prevent the absorbent body 13 from contracting at the crotch part, It is desirable that the direction is changed to a substantially arcuate curve.

  In the disposable diaper 1 of the present embodiment, the front side portion of the body does not have a bulge that becomes a catch like the back buttock of the body, and therefore, the sliding of the disposable diaper tends to occur mainly on the front body side F. The elastic member groups 28, 28,... Are arranged with a relatively tight inclination angle, and the expansion members 28, 28,. If it is arranged, 90% of the applied expansion / contraction force can be applied as an upward component force, and slipping of the paper diaper can be effectively prevented.

  In the side joint edges 21 and 22 of the front body F and the back body B, the elastic member 28i located closest to the waist opening in the abdomen curved elastic member group 28, 28. It arrange | positions so that the distance SF from the lower elastic member 24O may be within 20 mm. When the wearer pulls up with the side of the waist part when wearing, the front body F side of the disposable diaper is easily pulled upward by the elastic force of the abdomen curved elastic members 28, 28 ... so that the wearability is improved. Become.

  Furthermore, the arrangement | positioning space | interval of the ventral | curvature curved elastic member group 28,28 ... in the side part joining edge 21,22 of the front body F and the back body B, ie, the arrangement | positioning space | interval in the elastic member arrangement | positioning area FL of the side part side edge 21,22 Are substantially the same as the arrangement intervals of the ventral curved elastic member groups 28, 28... In the elastic member arrangement section MF of the crotch part, and are located on the inseam side among the ventral curved elastic member groups 28, 28. The elastic member 28O is disposed so as to draw a curved shape in which the distance FH from the crotch fold line CL of the diaper is within ± 50 mm, preferably within 35 mm. By arranging the intervals between the ventral curved elastic member groups 28, 28... At the side joint edges 21 and 22 and the crotch part, the outer sheet 20 is closely attached to the body in an even balance without the elastic force being concentrated. The lines drawn by the ventral curved elastic member groups 28, 28... Are arranged in a large wave curve shape that bypasses the region near the crotch, thereby holding the exterior sheet 20 tightly against the body. To get.

  By the way, a part of the ventral curved elastic member groups 28, 28... And a part of the dorsal curved elastic member groups 26, 26. , 28... And the most crotch elastic member 26 O in the back curved elastic member groups 26, 26. It is preferable that they are close to each other. The proximity width (FH-BH) is desirably 10 to 20 mm. In the latter case, since the absorbent main body 10 is pressed and adhered to the body side with equal pressure by the curved elastic member groups 28, 26,. Become so.

  Moreover, in the said form example, the waist elastic member group 25,25 ... arrange | positioned by the front body F and the back body B, and the curved elastic members 26 ..., 28 ... are arrange | positioned continuously also on the absorptive main body 10. FIG. However, as shown in FIG. 4, the elastic member that crosses the absorbent main body 10 may be cut to be discontinuous. By making the elastic member discontinuous on the absorbent main body, the absorber 13 can be further prevented from being compressed. It should be noted that the waist elastic member groups 25, 25... And the curved elastic members 26, 28... Are arranged in the state before cutting regardless of whether or not the elastic members are cut on the absorbent main body 10. As long as it is present, the above-described effects can be achieved.

(Point of the present invention)
In the above configuration, the present invention is applied to the absorber 13. That is, in this absorbent body 13, as shown in FIG. 7, on the dorsal side, from the lumbar part of the coccyx part to the both sides in the width direction of the coccyx part D1 and D2, and from the crotch part part of the coccyx part A quadrangular portion 13T surrounded by directions D3 and D4 toward both sides in the width direction while approaching the crotch portion side is formed as a notch. Such a quadrilateral portion 13T has a shape composed of two sides excluding the bottom sides of two triangles having a common bottom side and different heights.

  The position of the coccyx (shown with a cross in Fig. 7) changes depending on whether the product is an adult or a child, and the size of the product. It is preferable to determine. As a specific example of the position of the coccyx part, in the case of adults, the crotch on the center line WC in the width direction of the product (the product longitudinal direction center in the case of a longitudinally symmetrical product, the lowermost end in the product wearing state shown in FIG. The distance L1 from the position) is preferably in the range of 5 to 25 cm, particularly 8 to 18 cm, and for children, it is preferably in the range of 5 to 15 cm, particularly 7 to 13 cm.

  The directions D1 and D2 are preferably at an angle of 20 to 60 degrees, particularly 30 to 50 degrees with respect to the width direction center line WC, and the directions D3 and D4 are 60 to 60 degrees with respect to the width direction center line WC. It is preferable that the angle is 90 degrees, particularly 70 to 80 degrees.

  In the quadrangular portion 13T, the distance Y between the vertices of the higher triangle to the vertices of the lower triangle is preferably 0.5 to 5 cm, particularly 1 to 3 cm for adults. In the case of the same, it is preferably 0.5 to 5 cm, particularly preferably 1 to 3 cm. The two sides forming the apex angle in the higher triangle are equal, that is, preferably an isosceles triangle, and the length of each side is preferably 2 to 10 cm, particularly 4 to 6 cm for adults, In the case of children, it is preferably 2 to 8 cm, particularly 3 to 5 cm. The common base length of both triangles, that is, the width X of the quadrilateral portion is preferably 3 to 20 cm, particularly 4 to 10 cm for adults, and 3 to 16 cm, especially 4 to 4 for children. It is preferably 8 cm.

  When such a portion 13T is formed as a notch, as shown in FIGS. 8 to 10, in the mounting shape, the portion R1 along the bisector of the apex angle in the lower triangle is viewed from the inner surface side. And a portion R2 on the waist side from the apex of the higher triangle rises when viewed from the inner surface side, and the two ends of the lower triangle are the triangles in the higher direction. The quadrilateral 13T is deformed in the closing direction approaching the end portions forming the two sides.

  In particular, when a part of the dorsal curved elastic member groups 26, 26... Is configured to pass through the quadrangular portion 13T in the width direction, the elastic contraction force acts on the shape change. Is promoted.

  As a result, raised portions R1 and R2 are formed over substantially the entire crack, that is, over the range from the crotch portion to the lumbar region and to the lumbar region, and at the boundary between the raised portions R1 and R2, The ridges will bend along. Therefore, according to the present invention, the fit of the absorbent body 13 in the coccyx portion is significantly improved, and thus the feeling of wearing and the leakage prevention performance are improved.

  Further, in the illustrated form, a slit-like cutout portion 13 </ b> C is formed in the absorbent body 13 that continues from the edge of the back waist portion to the vicinity of the quadrangular portion 13 </ b> T through the center in the width direction. As a result, as shown in FIGS. 8 to 10, the edges of the slit-shaped notch 13 </ b> C are deformed so as to be close to each other, and a clear ridge R <b> 2 is formed in the center in the width direction from the waist to the tailbone. Thus, the fit at the waist side of the rupture is further improved. Moreover, such a shape change is promoted by the action of the elastic contraction force of the waist elastic member groups 25, 25.

  Such a slit-shaped notch 13C may have a constant width, but may have a shape in which the width increases from the vicinity of the quadrilateral portion 13T toward the edge of the waist. The widening angle α in this case (that is, the angle formed by each direction from the start point to the end point) determines the degree of the ridge R2 from the waist to the tailbone, and is 0 to 40 degrees, particularly 0 to 20 degrees. preferable.

  The shape of the edge of the waist in the absorbent body 13 can be determined as appropriate, for example, it may be linear along the waist circumference direction, but as shown in the figure, on both sides of the center in the width direction, It is a preferred embodiment that each has an arcuate portion 13E that swells away from the crotch side. In such a form, the edge of the waist becomes easy to follow the curve of the body, and a gap is hardly generated between the edge and the body.

  In a more preferable form, as shown in the figure, slits 13 </ b> S are formed in the absorbent body 13 so as to continue from the top of each buttocks to the waist while continuing to the periphery along the direction away from the center in the width direction. Thereby, as shown in FIGS. 8-10, it deform | transforms so that the edge parts of the slit-shaped notch part 13S may adjoin, and bulge R3 comes to be formed so that a collar part may be wrapped. As a result, the fit with respect to the buttocks is significantly improved. In particular, such a shape change has a combination of the dorsal curved elastic member groups 26, 26... And the waist elastic member groups 25, 25. It will be further promoted. In this case, it is particularly preferable that the dorsal curved elastic member groups 26, 26... And the waist elastic members 25, 25.

  The position of the top of the buttocks varies depending on whether the product object is an adult or a child, and among them the size, so it is preferable to determine the appropriate position accordingly, In the longitudinal direction, it is located on the waist side of the coccyx portion, and in the width direction, it is located in the vicinity of the center portion in the width direction in each of the left half and the right half in the width direction. As a specific example of the position of the top of the buttocks, the longitudinal distance L2 from the crotch (the product longitudinal direction center in the case of a symmetrical product) is in the range of 6 to 20 cm, particularly 10 to 15 cm in the case of adults. Preferably 3 to 18 cm, especially 4 to 12 cm for children, and the distance L3 from the center line WC in the width direction is 2 to 8 cm, particularly 3 to 6 cm for adults. In the case of children's use, it is preferably 2 to 8 cm, particularly preferably 3 to 5 cm.

  The extending direction D5 of the slit-shaped notch 13S preferably forms an angle of 0 to 40 degrees, particularly 5 to 30 degrees with respect to the width direction center line WC. The slit-shaped notch 13S may have a constant width, but preferably has a shape that starts from the top of the flange and becomes wider as it approaches the periphery. In this case, the widening angle β (that is, the angle formed by each direction from the start point to the end point) determines the degree of bulge of the buttock, and is preferably 0 to 40 degrees, particularly preferably 0 to 20 degrees.

  Further, in the illustrated embodiment, in order to improve the fit to the bulge of the lower abdomen, a slit-shaped notch 13F is formed on the abdomen side that continues from the lower end of the lower abdomen to the edge of the waist through the center in the width direction. As a result, as shown in FIGS. 8 to 10, the edges of the slit-shaped notch 13 </ b> F are deformed so as to be close to each other, and a three-dimensional bulge is formed in the lower abdomen, thereby further improving the fit. . Moreover, such a shape change is promoted by the action of the elastic contraction force of the waist elastic members 25, 25.

  Since the lower end position of the lower abdomen changes depending on whether the product object is an adult or a child, and the size of the object, it is preferable to determine an appropriate position accordingly. As a specific example of the lower end position of the lower abdomen, the distance L4 from the crotch on the center line WC in the width direction of the product is preferably in the range of 8 to 20 cm, particularly 10 to 18 cm for adults. For use, it is preferably in the range of 4 to 18 cm, particularly 6 to 16 cm.

  Although this slit-shaped notch 13F may have a constant width, a shape in which the width becomes wider from the lower end side of the lower abdomen toward the edge of the waist is preferable. In this case, the widening angle γ (that is, the angle formed by each direction from the start point to the end point) determines the degree of swelling of the lower abdomen, and is preferably 10 to 25 degrees, particularly preferably 12 to 18 degrees.

  On the other hand, when there is a deformation due to these slit-shaped notches 13C, 13S, 13F, etc., the edge of the waist is likely to have a discontinuous bent shape, and this shape brings a sense of incongruity to the wearer. . Therefore, the shape of each part, particularly the slit-shaped notches 13C, 13S, and the like, so that the waist edge of the absorbent body 13 forms a substantially continuous arc shape when worn on the body as shown in FIGS. It is preferable to design 13F.

(Other)
(A) As shown in FIG. 11, the slit-shaped notches 13C, 13S, and 13F can be omitted. Moreover, in the absorber 13 shown in FIG. 11, the edge of a waist | hip | lumbar part has the arc-shaped part 13E which swells in the direction away from a crotch part side on both sides in the width direction center, respectively, but this is abbreviate | omitted You can also. Moreover, as long as it has the quadrilateral part 13T, the absorber 13 can also be made into a general hourglass shape as shown in FIG. 12, or a rectangular shape as shown with a dashed-two dotted line.

(B) As can be seen from the quadrangular portion 13T of FIG. 11, the corners of the quadrangular portion 13T and the slit-shaped notches 13C, 13S, and 13F are not acute angles, but can be trimmed in an arc shape or a curved shape.

(C) The absorbent body 13 can be cut into the shape of the present invention after it is manufactured in advance in a simple shape such as a rectangle in addition to the shape of the present invention at the time of formation (for example, when the pulp is piled). .

(D) Instead of the notch 13T and the slit-like notches 13C, 13S, 13F of the quadrilateral portion, as shown in FIGS. 12 and 13, pressing depressions 113T, 113C, 113S, 113F formed by embossing or the like are formed. You may do it. In this case, the same shape deformation as the notches 13T, 13C, 11S, and 13F is achieved by bending the peripheral edges of the compressed recesses 113T, 113C, 113S, and 113F. In the present invention, all of the quadrilateral portion or the like may be unified into either a notch recess or a pressing recess (illustrated form), or a part may be a notch and the other may be a pressing recess.

(E) In the form shown in FIGS. 8 to 10, the edges of the quadrangular cutout portion 13T and the slit-like cutout portions 13C, 13S, and 13F (the same applies to the compressed concave portions) are closed close to each other. However, it is not necessary to close completely, and there may be a gap.

(F) In the present invention, it is preferable to use in combination with various elastic members that enhance fit, but the present invention is not limited to this. Therefore, for example, at least one of the waist elastic member groups 25, 25..., The dorsal curved elastic member groups 26, 26..., And the ventral curved elastic member groups 28, 28. It is also possible to adopt a form.

  The present invention can be applied to various absorbent articles such as pants-type disposable paper diapers, tape-type disposable paper diapers, and sanitary napkins for daytime and nighttime use.

It is a product state external view of the underpants type disposable paper diaper 1. It is an assembly drawing in the unfolded state. FIG. 3 is a development view of the exterior sheet 20. FIG. 6 is a development view illustrating a modified example of the exterior sheet 20. 2 is a plan view of the absorbent main body 10. FIG. (A) is a half cross-sectional view of the absorbent main body 10 in a developed state, and (B) is a diagram showing the product state. It is an expanded state top view of an absorber. It is the perspective view which looked at the absorber of a mounting state from the diagonal front. It is the perspective view which looked at the absorber of a mounting state from the back. It is a top view of the absorber of a mounting state. It is a deployment state top view of other absorbers. It is a deployment state top view of other absorbers. It is a deployment state top view of other absorbers. It is a deployment state top view of other absorbers.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Paper diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable surface sheet, 12 ... Leak-proof sheet, 13 ... Absorber, 13T ... Quadrilateral part, 13C, 13S, 13F ... Slit-shaped notch part, 13E ... Arc-shaped part , 14 ... Crepe paper, 15 ... Gathered nonwoven fabric, 16 ... Thread elastic elastic member, 20 ... Exterior sheet, 21, 22 ... Side joint edge, 24 ... Waist elastic member, 25 ... Hip elastic member, 26 ... Dorsal side Curved elastic member, 28 ... ventral curved elastic member, 29 ... leg circumference cut line, F ... front body, B ... back body, 113T, 113C, 113S, 113F ... compression depression.

Claims (6)

In an absorbent article comprising an absorbent body extending at least from the crotch part to the waist part over the coccyx part,
In the absorbent body, four sides surrounded by a direction from the lumbar part of the coccyx part toward both sides in the width direction of the coccyx part and a direction toward the crotch part from the part of the crotch part of the coccyx part toward the both sides of the crotch part An absorptive article in which a shape part is formed as a pressing crevice or a notch.   The absorbent article according to claim 1, wherein a slit-like cutout portion or a compressed concave portion is formed in the absorbent body so as to pass through the center in the width direction from the edge of the waist portion to the vicinity of the quadrilateral portion.   3. The absorbent article according to claim 1, wherein an edge of the waist portion of the absorbent body has arc-shaped portions that swell in a direction away from the crotch side on both sides of the edge in the width direction.   Either the slit-shaped notch part or pressing recessed part which continues to a peripheral edge along the direction away from the center of the width direction, approaching the waist | hip | lumbar part side from the top part of each buttocks is formed in the said absorber, respectively. The absorbent article according to item 1.   The absorbent article according to any one of claims 1 to 4, wherein an edge of the waist portion of the absorbent body is formed so as to form a substantially continuous arc shape when worn on the body.   The absorbent article of any one of Claims 1-5 by which the elastic member is arrange | positioned so that the contraction force of the width direction may act on the said quadrilateral part.

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