JP6164555B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers and sanitary napkins.

  In the absorbent article, due to the large gap between the surface of the absorbent article and the body, the excretory fluid is not absorbed smoothly, but leaks around the leg, back, and abdomen along the body surface. May cause. For this reason, conventionally, it has been proposed to improve the fit of the crotch portion of the absorbent article by providing a slit in the absorbent body or attaching an elastic member (see, for example, Patent Documents 1 to 4).

Japanese Patent No. 4261420 Japanese Patent No. 4398581 Japanese Patent No. 3660816 Japanese Utility Model Publication No. 06-021463

  However, the conventional products still have room for improvement in the fit to the excretion opening.

  Then, the main subject of this invention is improving the fitting property to an excretion opening | mouth and preventing transmission leak.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Having a crotch part, a front part and a rear part extending respectively to the front side and the rear side of the crotch part,
The crotch part has an excretion opening facing part including a part facing the excretion opening of the wearer, and an inner thigh facing part including a part facing the wearer's inner thigh, which is a part on both sides thereof. In the disposable diaper in which the absorbent body is provided in the excretory mouth facing part and the inner thigh facing part,
The absorber has a recess or slit having a predetermined width extending in the front-rear direction between the excretory opening facing portion and the inner thigh facing portion,
It has a liquid-permeable front side layer that passes over the recess or slit,
At the position on the recess or slit in the front side layer, an elongated elastic elastic member was fixed in an extended state along the front-rear direction.
An absorbent article characterized by the above.

(Function and effect)
In the absorbent article of the present invention, when worn between the crotch of the wearer, the excretory opening facing portion of the crotch portion is lifted with respect to the inner thigh facing portion, and the inner thigh facing portion is lowered so as to follow the inner thigh and fits Will do. In this case, according to the present invention, the sectional space of the recess or slit is sheared due to the positional relationship between the recess or slit and the elastic elastic member. The excretory opening facing part of the crotch part is raised with a step with respect to the inner thigh facing part. Therefore, in the absorbent article of this invention, the fitting property to an excretion opening improves.

  On the other hand, when an elastic elastic member is disposed on the back side of the slit as in Patent Document 4, both sides of the slit are lifted from the back side of the slit. It does not occur, and the whole width direction is lifted like a bow, and as a result, the fit to the excretion opening tends to be insufficient.

  Further, like the one described in Patent Document 4, if the entire width direction is lifted like a bow, the gap with the body becomes too small, and for example, it is easy to leak sideways when urinating a large amount in a disposable diaper. Since there is a step between the mouth facing portion and the inner thigh facing portion, a gap is easily formed between the step portion and the body, and the risk of side leakage is reduced.

<Invention of Claim 2>
The absorber has the slit,
It has a packaging sheet that wraps the absorber,
Of the portion of the packaging sheet located on the front side of the absorbent body, the portion corresponding to the slit falls from the opening on the front side of the slit to the opening on the back side of the slit along the inner wall of the slit, and the packaging sheet The absorbent article of Claim 1 joined to the part located in the back side of the said absorber in.

(Function and effect)
In order to facilitate the shear deformation of the present invention, it is preferable to provide a slit in the absorber. However, if the slit is simply provided, the space for the shear deformation may be crushed. As described above, it is desirable that the packaging sheet is dropped into the slit from the front side and joined to the back side so that the space for shearing deformation is reliably maintained.

<Invention of Claim 3>
The front side layer is formed of a sheet in which a portion located on the concave portion or the slit is folded in a Z shape and fixed in a lying state, and the elastic elastic member is interposed between the sheets of the folded portion in the Z shape. The absorbent article according to claim 1 or 2, wherein the part that is fixed and folded in the Z-shape is stretched across the recess or slit in the width direction.

(Function and effect)
By adopting such a structure, it is preferable that a portion located on the concave portion or slit of the front side layer does not easily fall into the concave portion or slit, and the space for shearing deformation of the present invention is firmly maintained.

  As described above, according to the present invention, there are advantages such as improved fit to the excretion opening and improved transmission leakage prevention performance.

It is a top view which shows the inner surface side of the expansion | deployment state of a pad type disposable diaper. It is a top view which shows only the principal part. It is YY sectional drawing of FIG. It is ZZ sectional drawing of FIG. It is the schematic of a mounting state. It is sectional drawing of another form. It is sectional drawing of another form. It is a top view of other forms. It is a top view of other forms.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “groin” in the terminology of the present invention means a part that corresponds to the crotch of the body at the time of use, and depending on the product, from the center in the front-rear direction of the article as shown in the figure to the predetermined part on the front side. Range, or a predetermined range at the center in the front-rear direction of the article. In the case of having a narrow constricted portion in the middle in the front-rear direction of the article or in the middle in the front-rear direction of the absorbent body, it means a predetermined front-rear direction range in which the minimum width portion of one or both constricted portions is the center in the front-rear direction. Further, “front part (abdominal part)” means a part on the front side of the crotch part, and “rear part (back side part)” means a part on the rear side of the crotch part.

  1 to 4 show a pad-type disposable diaper example 200 according to the present invention. This pad-type disposable diaper 200 has a crotch portion C2, and a front portion F2 and a rear portion B2 extending on both front and rear sides thereof. The dimensions of each part can be determined as appropriate. For example, the total length (length in the front-rear direction) L is about 350 to 700 mm, and the total width W1 is about 130 to 400 mm (however, wider than the width of the absorbent surface of the diaper). In this case, the length of the crotch portion C2 in the front-rear direction is about 10 to 150 mm, the length of the front portion F2 is about 50 to 350 mm, and the length of the rear portion B2 is about 50 to 350 mm. be able to.

  The pad-type disposable diaper 200 has a basic structure in which an absorbent body 23 is interposed between an inner surface of a liquid-impermeable back sheet 21 having an outer sheet 32 laminated on the outer surface and a liquid-permeable top sheet 22. ing.

  On the back side of the absorber 23, a liquid-impermeable back sheet 21 is provided so as to protrude slightly from the peripheral edge of the absorber 23. As the liquid-impermeable back sheet 21, in addition to a polyethylene film or the like, a sheet having moisture permeability can be used without impairing water shielding from the viewpoint of preventing stuffiness. 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. Can be used.

  Further, the outer surface of the liquid-impermeable back sheet 21 is covered with an exterior sheet 32 made of a nonwoven fabric, and this exterior sheet 32 protrudes outside the periphery of the back sheet 21 with a predetermined protrusion width. Yes. Various nonwoven fabrics can be used as the exterior sheet 32. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  The surface side of the absorber 23 is covered with a liquid-permeable top sheet 22. Although the absorber 23 partially protrudes from the side edge of the top sheet 22 in the illustrated form, the width of the top sheet 22 can be widened so that the side edge of the absorber 23 does not protrude. As the top sheet 22, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  It is desirable to interpose the intermediate sheet 25 between the top sheet 22 and the absorber 23. This intermediate sheet 25 is provided to prevent the urine that has been absorbed by the absorbent body 23 from returning, and uses a material having low water retention and high liquid permeability, such as various nonwoven fabrics and mesh films. Is desirable. When the front end of the top sheet 22 is 0% and the rear end of the top sheet 22 is 100%, the front end of the intermediate sheet 25 is preferably located in the range of 0 to 11%. It is preferably located in the range of 92 to 100%. The width W4 of the intermediate sheet 25 is preferably about 50 to 100% of the minimum width W5 of the constricted portion 23n of the absorber 23 described later.

  At both ends of the pad-type disposable diaper 200 in the front-rear direction, the exterior sheet 32 and the liquid-permeable top sheet 22 are attached to the front and rear ends of the absorbent body 23 so as to extend to the front and rear sides, respectively. Part EF is formed. On both sides of the pad-type disposable diaper 200, the exterior sheet 32 extends outward from the side edge of the absorbent body 23, and the inner surface of the portion from the extension to the side of the top sheet 22 has three-dimensional gathers. A portion 24x on the outer side in the width direction of the gather sheet 24s that forms 24 is attached over the entire front-rear direction to constitute a side flap portion SF in which the absorber 23 does not exist. These pasted portions are shown as dotted patterns in FIG. 1, and can be formed by hot melt adhesive, heat sealing, or ultrasonic sealing. When the exterior sheet 32 is not provided, the liquid-impervious backsheet 21 can be extended to the side flap part SF instead of the exterior sheet 32 to form the outer surface side of the side flap part SF.

  As a material for the gather sheet 24s, a plastic sheet or a melt-blown nonwoven fabric can be used, but from the viewpoint of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.

  A portion 24c on the center side in the width direction of the gather sheet 24s extends to the top sheet 22, and an elongated elastic member 24G is stretched along the front-rear direction at the end portion on the center side in the width direction. It is fixed with a melt adhesive or the like. As the elongated elastic member 24G, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc., which are formed in a thread shape, a string shape, a belt shape, or the like. Ordinarily used materials can be used.

  Further, both gather sheets 24s are fixed by being bonded to the inner surface of the article (the top sheet 22 surface and the outer sheet 32 inner surface in the illustrated embodiment) with the widthwise outer portion 24x extending over the entire front-rear direction. 24c is bonded and fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment) at both ends in the front-rear direction, and is fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment) between both ends in the front-rear direction. Absent. As shown in FIG. 1, the non-fixed portion is a portion that serves as a leakage prevention wall that stands up elastically with respect to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment). It is located at the boundary between the fixed portion 24x on the outer side in the width direction at 24s and the inner portion 24c.

  The absorbent body 23 is basically made of a pulp fiber pile, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and is obtained by mixing, adhering, etc., a superabsorbent polymer such as particulates as necessary. Can be used. The absorbent body 23 can be wrapped with a wrapping sheet 26 such as crepe paper as required, such as when mixing superabsorbent polymer particles. Moreover, the shape of the absorber 23 can be set to an appropriate shape such as a strip shape in which the front portion is relatively narrower than the rear portion, a rectangular shape, or a trapezoidal shape.

The fiber basis weight and the basis weight of the superabsorbent polymer in the absorbent body 23 can be appropriately determined, but the fiber basis weight is preferably about 100 to 600 g / m ^2, and the basis weight of the absorbent polymer is about 0 to 400 g / m ^2. Is preferable.

  The absorber 23 is formed as a narrowed portion 23n having a narrow predetermined portion in the middle in the front-rear direction including the crotch portion C2. The minimum width W5 of the constricted portion 23n is preferably about 50 to 65% of the width W2 of the non-constricted portion located before and after the constricted portion 23n. When the front end of the article is 0% and the rear end of the article is 100%, the front end of the constricted portion 23n is preferably located in the range of 10 to 25%, and the rear end of the constricted portion 23n is 40 to 65%. It is preferable that the part which becomes the minimum width W5 of the constricted part 23n (minimum width part) is located in the range of 25 to 30%.

  Characteristically, the crotch part C2 of the pad-type disposable diaper 200 faces the excretion opening facing part 201 including a part facing the excretion opening of the wearer, and the wearer's inner thigh, which is a part on both the left and right sides thereof. The width is such that it includes the inner thigh facing portion 202 including the part, and the excretory opening facing portion 201 and the inner thigh facing portion 202 are portions in which the absorber 23 is built. The width W3 of the crotch portion C2 can be about 150 cm or more, particularly about 200 to 260 cm, for an adult. Moreover, as a form which incorporates the absorber 23 in the excretion opening | mouth opposing part 201 and the inner thigh opposing part 202, the form provided with the integral absorber 23 covering the excretion opening | mouth opposing part 201 and the inner thigh opposing part 202 like the illustration form. In addition, the form which equips each part 201,202 with the separate absorber 23 is also employable.

  And the absorber 23 has the slit 40 of the predetermined width extended in the front-back direction between the excretion opening | mouth opposing part 201 and the inner thigh opposing part 202. As shown in FIG. Further, in the illustrated embodiment, the top sheet 22 and the second sheet 25 are provided as the liquid-permeable front side layer passing over the slit 40. However, when the second sheet 25 is omitted, only the top sheet 22 is the front side layer. If another sheet is interposed, the front side layer including the other sheet is formed. However, the sheet | seat which falls in the slit 40, without passing over the slit 40 like the front side part of the packaging sheet 26 of illustration form is not contained in a front side layer.

  As long as the slit 40 is provided in the crotch portion C2, the length 40L in the front-rear direction is not particularly limited. Therefore, the slit 40 can be provided over the entire front-rear direction of the absorber 23. It is desirable to extend from the crotch side end to the crotch side end of the rear part B2. Further, as shown in FIG. 8, the rear portion of the slit 40 is bent toward the outside in the width direction (the front side can also be bent in the same manner), and as shown in FIG. A slit 41 may be provided. More specifically, when the front end of the disposable diaper 200 is 0% and the rear end of the disposable diaper 200 is 100%, the front end of the slit 40 is preferably located in a range of 15 to 30%. The rear end of 40 is preferably located in the range of 40 to 70%.

  The width 40W of the slit 40 (in the illustrated embodiment, equal to the interval between the excretory opening facing portion 201 and the inner thigh facing portion 202) is not particularly limited as long as the opposing side walls are separated from each other. Can be about. However, the slit having no gap width (contacting the opposite side walls) does not satisfy the condition of “predetermined width”, and a space 210 for shearing deformation described later is not formed. Not included.

  As long as the slit 40 is positioned between the excretory opening facing portion 201 and the inner thigh facing portion 202, the interval 40D between the left and right slits 40 can be determined as appropriate. It is preferably about 10 to 30% of the small width W5.

An example of the dimensions of each part for adults is as follows.
Product total length L: 630mm
Length 40F from the front end of the product to the front end of the slit 40: 120 mm
Length 40B from product rear end to rear end of slit 40: 290 mm
Interval 40D between left and right slits 40: 25 mm
Width 40W of slit 40: 20mm
Length 40L of slit 40 in the front-rear direction: 220mm

  Further, at the position on the slit 40 in the front side layer, an elongated elastic elastic member 42 is fixed in an extended state along the front-rear direction. As long as a part of the elastic expansion / contraction member 42 is positioned on the slit 40 in the front-rear direction, both ends or one end may protrude from the slit 40 as shown in the figure, and the entire elastic member 42 is entirely slit 40. It may be located above. Unlike the illustrated embodiment, the number of elastic elastic members 42 provided on each slit 40 may be a plurality, and in that case, it is desirable to arrange all of the plurality of elastic elastic members on the slits.

  The elongation rate when the elastic elastic member 42 is fixed may be determined as appropriate, but it is preferably about 180 to 260% in a normal case. Further, the thickness of the elastic elastic member 42 may be determined as appropriate, but it is preferably about 470 to 940 dtex in a normal case.

  In the pad-type disposable diaper 200 configured as described above, when the wearer's crotch is worn, as shown in FIG. 5A, the excretory opening facing portion 201 of the crotch portion C2 is opposed to the inner thigh facing portion 202. And the inner thigh opposing part 202 is lowered and fits along the inner thigh. At this time, due to the positional relationship between the recess or slit 40 and the elastic expansion / contraction member 42, the cross-sectional space 210 of the recess or slit 40 is shear-deformed (the side walls on the side in the width direction approach the side walls on the outer side in the width direction while the side walls approach each other). And the excretory opening facing portion 201 of the crotch portion C <b> 2 is lifted with a step with respect to the inner thigh facing portion 202. Therefore, in the absorbent article, the fit to the excretion opening is improved.

  On the other hand, as shown in FIG. 5B, when the elastic elastic member 42 is disposed on the back side of the slit 40, both sides thereof are lifted from the back side of the slit 40. Such shear deformation of the space 210 does not occur, and the entire width direction is lifted up like a bow, and as a result, the fit to the excretion opening tends to be insufficient. Further, as shown in FIG. 5B, when the entire width direction is lifted like a bow, the gap with the body becomes too small, and for example, when a large amount of urination is performed in a disposable diaper, side leakage is likely to occur. As shown in a), if there is a step between the excretory opening facing portion 201 and the inner thigh facing portion 202, a gap is easily formed between the stepped portion and the body, and there is little risk of side leakage. It will be a thing. In addition, the part shown with the dashed-two dotted line in FIG. 5 represents the vicinity of a wearer's crotch.

  On the other hand, in place of the slit 40 penetrating the absorber 23 in the thickness direction as shown in the figure, a recess recessed from the front side to the back side is provided, and a space 210 in the recess allows the same mounting as in the slit 40 form. Shear deformation can also occur. Such a recess can be formed by partially compressing the absorbent body as in embossing, or by partially lowering the material. However, in order to make shear deformation easy, it is preferable to provide the slit 40 in the absorber 23 as shown in the figure.

  Moreover, since the space 210 for shearing deformation may be crushed if the slits 40 are simply provided in the absorbent body 23, the packaging sheet 26 that wraps the absorbent body 23 is used, as shown in the figure. Of the portion of the packaging sheet 26 located on the front side of the absorbent body 23, the portion corresponding to the slit 40 falls from the opening on the front side of the slit 40 to the opening on the back side of the slit 40 along the inner wall of the slit 40. Joining to the portion of the sheet 26 located on the back side of the absorber 23 is preferable because the space 210 for shearing deformation is reliably maintained.

  The attachment structure of the elastic elastic member 42 to the front layer is not particularly limited. For example, as shown in FIG. 6, the fixing sheet 43 is pasted on the top sheet 22, and the elastic elastic member 42 is interposed between the sheets 22 and 43. A structure that is sandwiched and fixed by a hot melt adhesive, or, as shown in FIG. 7, an elastic elastic member 42 is sandwiched between two layers of the fixing sheet 44 folded at both ends, and is fixed by a hot melt adhesive. Is attached to the top sheet 22 (or any other part as long as it is on the slit 40) with a hot-melt adhesive or the like, although not shown, an elastic elastic member 42 is provided between the top sheet 22 and the intermediate sheet 25. It can also be set as the structure fixed by pinching and a hot-melt-adhesive.

  In particular, as shown in FIG. 4, the portion located on the slit 40 in the top sheet 22 (which may be a constituent sheet of the front layer) is folded in a Z shape and fixed in a lying state with a hot melt adhesive or the like, The portion 22z folded in the Z-shape is in a state of being stretched across the slit 40 in the width direction, and the elastic stretchable member 42 is placed between the sheets of the Z-folded portion 22z with a hot melt adhesive. If fixed by, for example, the portion 22z located on the slit 40 is high in rigidity, it is difficult for the portion 22z to fall into the slit 40, and the space 210 for shear deformation described above is firmly maintained, which is preferable. In addition, by using the top sheet 22 in this way, there is an advantage that the elastic elastic member 42 can be fixed without adding a separate sheet. The folding portion 22z does not have to be joined to the opposing surface except at the attachment position of the elastic expansion / contraction member 42. However, in order to improve the shape stability of the folding portion 22z, the opposing surface of the folding portion 22z as shown in the figure. It is also preferable to join the whole.

<Others>
In the above example, the absorber 23 has a single-layer structure, but can also have a two-layer structure, in which case the slit 40 (or recess) is provided in either one (especially the upper layer is preferred), It can also be provided so as to cover both the upper and lower layers in the thickness direction.

  INDUSTRIAL APPLICABILITY The present invention can be used for absorbent articles in general, including disposable diapers such as pad-type disposable diapers, pants-type or tape-type disposable diapers, and sanitary napkins.

  B2 ... Rear side part, C2 ... Crotch part, F2 ... Front side part, 21 ... Impervious back sheet, 22 ... Top sheet, 23 ... Absorber, 24 ... Solid gather, 24s ... Gather sheet, 25 ... Intermediate sheet, 26 ... packaging sheet, 32 ... exterior sheet, 40 ... slit, 41 ... other slits, 42 ... elastic elastic member, 43 ... fixing sheet, 200 ... pad type disposable diaper, 201 ... excretory opening facing part, 202 ... inner thigh Opposing part, 210 ... space.

Claims (3)

Having a crotch part, a front part and a rear part extending respectively to the front side and the rear side of the crotch part,
The crotch part has an excretion opening facing part including a part facing the excretion opening of the wearer, and an inner thigh facing part including a part facing the wearer's inner thigh, which is a part on both sides thereof. In the disposable diaper in which the absorbent body is provided in the excretory mouth facing part and the inner thigh facing part,
The absorber has a recess or slit having a predetermined width extending in the front-rear direction between the excretory opening facing portion and the inner thigh facing portion,
It has a liquid-permeable front side layer that passes over the recess or slit,
At the position on the recess or slit in the front side layer, an elongated elastic elastic member was fixed in an extended state along the front-rear direction.
An absorbent article characterized by the above. The absorber has the slit,
It has a packaging sheet that wraps the absorber,
Of the portion of the packaging sheet located on the front side of the absorbent body, the portion corresponding to the slit falls from the opening on the front side of the slit to the opening on the back side of the slit along the inner wall of the slit, and the packaging sheet The absorbent article of Claim 1 joined to the part located in the back side of the said absorber in.   The front side layer is formed of a sheet in which a portion located on the concave portion or the slit is folded in a Z shape and fixed in a lying state, and the elastic elastic member is interposed between the sheets of the folded portion in the Z shape. The absorbent article according to claim 1 or 2, wherein the part that is fixed and folded in the Z-shape is stretched across the recess or slit in the width direction.

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