JP4912069B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (cage sheet), and an incontinence pad.

  When the conventional absorbent article is attached to the body, the absorbent body arranged inside the absorbent article cannot be freely deformed, and a gap with the body is likely to occur, and thus leakage may occur.

  On the other hand, an absorbent article that can be used in two types according to the shape of the underwear has been proposed by providing an inner joint line of the absorbent body and cutting it along the joint line (see Patent Document 1 below). However, since this absorbent article has the rear end portion of the first absorber extending from the front aligned with the rear end portion of the second absorber located at the rear from both sides, when used as it is, The fit to the body worsens.

JP 2001-340376 A

  This invention is made | formed in view of the said subject, and it aims at providing the absorbent article which is excellent in the fitting property to the body at the time of mounting | wearing, and has a high leak prevention effect.

  The present invention is an absorbent article including a top sheet, a back sheet, and an absorbent body interposed between the two sheets, the absorbent body being arranged from the front portion to the rear portion and rearward at the rear portion. A first absorption portion having a narrow width toward the first portion, and a second absorption portion disposed on both sides of the narrow portion of the first absorption portion. The above-mentioned object is achieved by providing an absorbent article provided to be positioned in front of the rear end of the two absorbent parts.

  The absorbent article of this invention is excellent in the fitting property to the body at the time of mounting | wearing, and its leak prevention effect is high.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
FIG.1 and FIG.2 shows typically 1st Embodiment which applied the absorbent article of this invention to the sanitary napkin. In these drawings, reference numeral 1 denotes a sanitary napkin (hereinafter also simply referred to as a napkin).

  As shown in FIGS. 1 and 2, the napkin 1 of the present embodiment includes a top sheet 2 constituting a skin contact surface, a back sheet 3 constituting a non-skin contact surface, and a top sheet 2 and a back sheet 3. And an absorber 4 interposed between the two and substantially vertically formed. The absorber 4 is disposed and fixed between the two sheets 2 and 3. The napkin 1 according to the present embodiment includes wing flaps 5 and 5 for preventing slippage protruding on both sides. The wing flaps 5 and 5 are folded back to the non-skin contact surface side at the time of wearing and fixed to underwear such as shorts.

  The absorber 4 has a first absorption part 41 and a second absorption part 42. The first absorbent portion 41 is arranged from the front portion to the rear portion of the napkin 1 and is provided so that the width gradually decreases rearward from substantially the center in the longitudinal direction of the wing flaps 5 and 5. The second absorption portion 42 is disposed symmetrically on both sides of the narrow portion of the first absorption portion 41. A separation portion 43 is provided between the first absorption portion 41 and the second absorption portion 42, and the first absorption portion 41 and the second absorption portion 42 are independent. It is preferable that the constituent material of each absorbing portion does not remain at all in the separating portion 43, but when the absorbing portions are provided by stacking fibers or the like, the constituent material slightly accumulates on the separating portion 43 and remains. It is included in the present invention if the absorbing portions are provided so as to be substantially separated from each other.

  The first absorption portion 41 is provided such that the rear end portion 410 is positioned in front of the rear end portion 420 of the second absorption portion 42 (upward in FIG. 1). For this reason, when the napkin 1 is mounted, the separation portion 43 serves as a bending start point, and the second absorption portion 42 outward from the separation portion 43 is broken, but the first absorption portion 41 is rearward (downward in FIG. 1). Since it is thin, it fits in the area where the width from the crotch part to the groove between the groin becomes narrow. In addition, since the second absorption portion 42 is bent in a mountain-fold shape while suppressing the influence of bending at the separation portion 43, at least the first absorption portion 41 of the separation portion 43 and the rear end portion 420 of the second absorption portion 42. A portion corresponding to the distance D1 (see FIG. 1) enters the groove between the buttocks, so that the second absorption portion 42 can be fitted to the body, and leakage prevention properties are improved.

  The 2nd absorption part 42 is provided so that a width may become narrow gradually toward the front. Therefore, the effect of fitting the body shape and movement in the crotch portion can be obtained while covering the buttocks widely in the rear portion. The second absorption part 42 is arranged so that the front end part 421 is positioned at the approximate center of the wing flap 5 in the longitudinal direction. As a result, when the wing flaps 5 and 5 are bent and fixed to the underwear such as shorts, the front end portion 421 of the second absorbent portion 42 is also centered on the separation portion 43 by the force of closing the thigh. The rear side of the second absorption part 42 is deformed as shown in FIG. 3 by the force of closing the thighs and the force of pressing the thighs against the body side by the elastic member of the undergarment. 1 absorption part 41 is pushed up in a human body direction in the back part from the longitudinal direction approximate center of wing flap 5. Therefore, the 1st absorption part 41 fits a human body and the leak prevention effect increases. Moreover, since the separation part 43 which does not have an absorptivity is provided between the 1st absorption part 41 and the 2nd absorption part 42, the bodily fluid discharged | emitted from the crotch part to the 1st absorption part 41 is the 1st absorption part. It is difficult to shift to the second absorption part 42 until the absorption capacity of 41 is exceeded. Therefore, the second absorption part 42 only needs to have an absorption performance corresponding to the retention of the body fluid that has been absorbed by the second absorption part 42 through the body.

As the material constituting the first absorption part 41 and the second absorption part 42, a known material conventionally used for sanitary napkins can be used without particular limitation. As a preferred constituent material of the first absorbent part 41 and the second absorbent part 42, an absorbent polymer is mixed between a sheet of paper, nonwoven fabric or the like by mixing a pulp and an absorbent polymer, depending on the adhesive or wet adhesiveness. And a polymer sheet, a dry pulp sheet and the like. In addition, for ease of transport during production, these sheets or each of the first absorbent part 41 and the second absorbent part 42 are each wrapped with absorbent paper of about 10 to ²⁰ g / m ² or a nonwoven fabric subjected to hydrophilic treatment. But it ’s okay.

  The thickness of the first absorbent portion 41 is preferably 1 to 15 mm, and more preferably 3 to 10 mm, considering the absorbency and the fit from the crotch portion to the heel portion. The thickness of the second absorbent portion 42 is preferably 30 to 100% of the thickness of the first absorbent portion 41 in consideration of the fit to the groove between the flanges, and the thickness is preferably 1 to 15 mm, 1.5 to 5 mm is more preferable.

The basis weight of the first absorbent portion 41, in consideration of the absorption, preferably ^{50~1000g / m 2, 100~700g / m} 2 is more preferable. The second absorbent portion 42 is preferably 20 to 500 g / m ² , more preferably 50 to 200 g / m ² from the viewpoint of preventing transfer leakage due to fit rather than absorption holding capacity.

  It is preferable that the 1st absorption part 41 contains the absorptive polymer from a viewpoint of improving absorptivity and fit property. As for an absorptive polymer, it is preferable that 10 to 50% of the weight of the 1st absorption part 41 is mix | blended, More preferably, it is 20 to 30%. The 2nd absorption part 42 does not need to be included from the viewpoint of the fitting property to the groove | channel between ridge parts, and a softness | flexibility, and it is 5-30 with respect to the 2nd absorption part 42 to such an extent that absorptivity and a softness | flexibility are not impaired. The absorbent polymer may be contained in an amount of about% by weight.

  The separation portion 43 that makes the first absorption portion 41 and the second absorption portion 42 independent as described above has a symmetrical curved shape that is recessed toward the center of the napkin 1 in the width direction. The rear portion of 41 easily matches the curved shape of the body, and the napkin 1 is easy to fit on the body. The curved shape on the first absorption portion 41 side in the separation portion 43 is well suited to the hollow shape of the body and can improve the fit of the napkin 1 to the body. The curved shape of the separating portion 43 on the second absorbing portion 42 side is such that the rear end portion 420 of the second absorbing portion 42 is fitted by a groove between the flange portions.

In the napkin 1, the second absorbent portions 42 are separated from each other at the rear of the rear end portion 410 of the first absorbent portion 41. Therefore, the second absorbent portions 42 are more easily bent, and as shown in FIG. The fit can be further enhanced. The distance D1 between the rear end portion 410 of the first absorbent portion 41 and the rear end portion 420 of the second absorbent portion 42 is preferably 5 to 100 mm, and preferably 10 to 50 mm, considering the fit and wearing feeling of the first absorbent portion 41. Is more preferable. Moreover, the distance D2 of the separation part 43 between the 2nd absorption parts 42 is 1-30 mm when the fitting property which does not inhibit shape deformation of both the 1st absorption part 41 and the 2nd absorption part 42 at the time of mounting | wearing, and an absorptivity are considered. Preferably, 5-20 mm is more preferable. Moreover, when the space | interval D2 of the separation part 43 between the 2nd absorption parts 42 is 15-30 mm, the separation part 43 can be more adapted to a body by the effect of the curved shape of the 2nd absorption part 42. FIG.

In the napkin 1 of the present embodiment, the top sheet 2 and the back sheet 3 are joined at the separation portion 43 between the first absorption portion 41 and the second absorption portion 42.
When joining the topsheet 2 and the backsheet 3 at the separation portion 43, if the topsheet 2 and the backsheet 3 are joined behind the rear end portion 410 of the first absorbent portion 41, the first absorbent portion The vicinity of the rear end portion 41 of 41 is preferable from the viewpoint that it easily fits the body. On the other hand, the fact that the top sheet 2 and the back sheet 3 are not joined in the vicinity of the front end portion 421 of the second absorbent portion 42 makes the touch and the liquid of the absorbent body easily move, and side leakage occurs. It is preferable because it becomes difficult.

  The 1st absorption part 41 and the 2nd absorption part 42, and the surface sheet 2 and the back surface sheet 3 can be joined from the point of the twist prevention of a 1st / 2nd absorption part, and the improvement of the flexibility in a boundary part. Although it is preferable, when the 1st / 2nd absorption part is a polymer sheet as described in the above paragraph [0013], it may not be joined. As a specific bonding mode, (1) the upper surface of each absorbing portion is bonded to the top sheet 2, and the lower surface of each absorbing portion is bonded to the back sheet 3, and (2) the upper surface of each absorbing portion is the top sheet 2. Or the form which joins the lower surface of each absorption part to back sheet 3 is mentioned. As a bonding method, a bonding method is adopted so as not to disturb the absorbability of the absorber 4, and specifically, a known bonding method such as a bonding method using heat sealing or a bonding method using a hot melt adhesive is adopted. Is done.

  The top sheet 2 is composed of a liquid permeable sheet. As the liquid-permeable sheet, a known liquid-permeable sheet that has been conventionally used for this type of absorbent article can be used without particular limitation. The liquid permeable sheet is not particularly limited as long as it can permeate the liquid to the absorbent body 4, but a sheet having a feeling close to underwear is particularly preferable. Examples of such a liquid permeable sheet include a woven fabric, a non-woven fabric, a perforated film sheet, and the like. In particular, the core-sheath structure type (including side-by-side type) composite fiber using polypropylene or polyester as the core component and polyethylene as the sheath component is made into a web by carding and then nonwoven fabric by the air-through method. (It is possible to apply a pore opening treatment to a predetermined place thereafter), and from the point of high liquid permeability (dry feeling), an aperture sheet made of polyolefin such as low density polyethylene is also preferably used. Can do.

  The back sheet 3 is composed of a liquid impermeable sheet. As the liquid-impermeable sheet, a liquid-impermeable sheet conventionally used for this type of absorbent article can be used without any particular limitation. As such a liquid-impermeable sheet, for example, a thermoplastic resin added with an inorganic compound or an organic compound filler is melt-extruded from a T die or a circular die to form a film, and then the film is uniaxially formed. Alternatively, a porous sheet having moisture permeability obtained by biaxial stretching can be used. It is also preferable from the viewpoint of air permeability and flexibility to use a laminated nonwoven fabric (for example, SM, SMS, SMMS, etc.) obtained by laminating a spunbond nonwoven fabric (S) and a melt blown nonwoven fabric (M). In addition, when the leak-proof sheet | seat is interposed in the non-skin contact surface of an absorber, the back surface sheet 3 does not need to be liquid-impermeable.

  The wing flap 5 includes a sheet 50 that covers both side edges of the top sheet 2 and a back sheet 3. An adhesive 51 for preventing slippage is applied to the back sheet 3. As the sheet constituting the sheet 50, a known sheet that has been conventionally used for this type of absorbent article can be used without any particular limitation. A preferable sheet of the sheet 50 includes a water-repellent nonwoven fabric, for example, the laminated nonwoven fabric.

  In the napkin 1 of the present embodiment, the first absorbent portion 41 of the absorbent body 4 is provided such that the rear end portion 410 is positioned in front of the rear end portion 420 of the second absorbent portion 42, and the second Since the deformation of one of the absorbent parts 42 when the napkin 1 is mounted on the body is suppressed from affecting the deformation of the other, it can be deformed more flexibly than in the prior art. Therefore, the fit to the body is good and the leakage prevention property is enhanced. Moreover, since the absorption part is defined by the 1st absorption part 41 and the 2nd absorption part 42 via the separation part 43, and the deformation | transformation along the separation part 43 occurs easily, when the napkin 1 is mounted | worn to the body The fit to the body is further improved. Furthermore, since the second absorption part 42 has a gap D2 at the rear and is provided so that the width becomes narrower toward the front, the rear part fits in a buttock shape while covering the heel part widely, and at the crotch part Fits body shape and movement.

  4 to 8 schematically show other embodiments in which the absorbent article of the present invention is applied to a napkin. In these drawings, the same reference numerals are used for parts common to the first embodiment. The description is omitted. Therefore, the description in the first embodiment is appropriately applied to a portion not particularly described.

  The napkin 1 ′ of the second embodiment shown in FIGS. 4 and 5A to 5C has a boundary portion 44 between the first absorption portion 41 and the second absorption portion 42, and further has a first absorption. The napkin 1 has the same configuration as that of the napkin 1 of the first embodiment except that the absorbent paper 40 that wraps the portion 41 and the second absorbent portion 42 is included. The napkin 1 of the second embodiment also has the same configuration as that of the first embodiment. The same effect as the napkin 1 is produced. Hereinafter, differences from the first embodiment will be described.

  The boundary portion 44 between the first absorption portion 41 and the second absorption portion 42 is formed thinner than the first absorption portion 41 and the second absorption portion 42. The boundary portion 44 is formed by laminating the forming materials of the first absorbent portion 41 and the second absorbent portion 42 in the first embodiment on the front and back surfaces of the thin absorbent sheet 45 corresponding to the planar form of the absorber 4. Can do. In addition to the configuration in the present embodiment, the boundary portion 44 can be formed by a method of reducing the thickness of the portion that is desired to be the boundary portion 44 of the absorber by compression.

The boundary portion 44 is preferably 5 to 30% thicker than the first absorbing portion 41 and the second absorbing portion 42 from the viewpoint of flexibility. By the boundary portion 44, the liquid can be gradually moved to the second absorption portion 42 before the liquid overflows from the first absorption portion 41, so that the anti-moisture effect can be further enhanced. Therefore, it is preferable that the boundary portion 44 is highly compressed or has a low basis weight so that a large amount of liquid cannot be moved. In the boundary part 44 in the case of high compression, since the liquid can be appropriately led to the second absorption part 42, it is preferable in that a surface dry feeling at the time of use is easily obtained, and the basis weight is 100 to 500 g / m ² . The density is preferably 0.2 to 0.6 g / cm ³ . When the density is lower than 0.2 g / cm ³ , the amount of liquid passing therethrough increases, and when the density is higher than 0.6 g / cm ³ , bending becomes difficult. In the boundary part 44 in the case of low basic weight, it is preferable at the point from which flexibility is good and fitting property is favorable, and it is preferable that basic weight is 10-200 g / m < ² >. The basis weight of the boundary portion 44 is preferably 10 to 60% of the first absorbent portion 41 and 20 to 80% of the second absorbent portion 42 from the viewpoint of flexibility and suppression of diffusion of the absorbent body.

From the viewpoint of making the boundary portion 44 less susceptible to the effects of stability during the transport process during manufacturing and various external forces during mounting, as shown in FIGS. 4 and 5 (a) to (c), It is preferable to wrap the first absorbent portion 41 and the second absorbent portion 42 with absorbent paper 40. Further, from the viewpoint of stabilizing the state wrapped with the absorbent paper 40, an adhesive may be applied between the absorbent paper 40, the first absorbent portion 41, and the second absorbent portion 42 by means that does not impair the absorbability. . In FIG. 5, the boundary portion 44 is not joined to the absorbent paper 40, but may be joined by a joining method such as an adhesive or heat seal.
Similarly to the method of joining the absorbent portion and the top sheet and the back sheet in the first embodiment, even when wrapped with the absorbent paper 40 as in this embodiment, the absorbent paper 40 and the top sheet 2 and / or By joining the back sheet 3, it is preferable because the absorbent body in the napkin 1 ′ can be integrated.

  The napkin 1 'of the third embodiment shown in FIG. 6 is provided in the same manner as the napkin 1' of the second embodiment except that the distances D1 and D2 are different from those of the first and second embodiments. Since the napkin 1 ′ of the present embodiment has the gap D <b> 2 longer than the gap D <b> 1, the fitting property in the groove between the ridges is enhanced, the discomfort is very little, and the boundary 44 is provided. The liquid stopping effect can also be enhanced.

  The napkin 1 ′ of the fourth embodiment shown in FIG. 7 is the first except that the second absorbent portion 42 is formed up to the rear flap portions 6, 6 beyond the widthwise side portion of the first absorbent portion 41. It is provided similarly to the napkin 1 of the embodiment. In addition to the effect of the napkin 1 of the first embodiment, the napkin 1 ′ of the present embodiment has the second absorbent portion 42 formed up to the rear flaps 6, 6. .

  The napkin 1 ′ of the fifth embodiment shown in FIG. 8 is provided in the same manner as the napkin of the first embodiment, except that the spacing portion 43 is formed in a linear shape. Similarly to the napkin 1 of the first embodiment, the napkin 1 ′ of the present embodiment is also excellent in fit to the body when worn and has a high leakage prevention effect.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

  The present invention is suitable for a napkin provided with wing flaps 5 and 5 as in the above embodiments, but can also be applied to a napkin not provided with a wing flap. In this case, it is arranged that the front end portion of the second absorption portion is positioned in the vicinity of the excretion point in that the first absorption portion is raised due to the bending of the separation portion 43 or the boundary portion 44, and the fitting property is increased. preferable. Here, the excretion point varies depending on the wearer's body, the underwear to be used, the form at the time of wearing, etc., but when using sanitary shorts, etc., the width at the crotch portion of the sanitary shorts is the narrowest In the case of a product near the position and having a product length of 200 mm or more, it refers to a position of about 100 mm to 150 mm from the front end in the longitudinal direction.

  In the absorbent article of the present invention, when the absorbent portion is provided by wrapping the absorbent portion with absorbent paper, each absorbent portion may be wrapped with one absorbent paper, or each absorbent portion may be wrapped with absorbent paper. In addition, even when a separation portion is provided between the respective absorption portions, the separation portion can be provided between the absorption portions covered with the absorption paper by wrapping each absorption portion in the absorption paper.

  Further, in the absorbent article of the present invention, the absorbent paper in a portion where the absorbent portion is not disposed may be cut out, but the separating paper 43 and the absorbent paper 40 of the second absorbent portion 42 are arranged on the back sheet 3 side. By doing so, it is good also as a boundary part.

  Moreover, the absorbent article of this invention is applicable also to the absorptive article of the form in which an absorber has a middle-high part. It is preferable to form this middle-high part by making the 1st absorption part of predetermined width and predetermined length into the middle height along the width direction central axis of a 1st absorption part. This middle-high part can be formed from the excretion point (the center position of the wing flap) to the rear end part 410 of the first absorption part 41. In this case, the separation part 43 or the boundary part 44 and the distance D2 are good as shown in FIG.

  Moreover, the absorbent article of this invention WHEREIN: In the form which has a boundary part between each absorption part, the form of the said boundary part can also be made into a linear form similarly to the separation part of FIG.

  Moreover, although it is preferable that the absorbent article of this invention is joined to the top sheet and / or the back sheet, the absorbent body is not joined to the top sheet and / or the back sheet. By joining the top sheet and the back sheet so as to surround the periphery, the absorbent body in the napkin can be integrated.

  The absorbent article of the present invention is suitable for absorbent articles such as panty liners and incontinence pads in addition to the sanitary napkin as in the above embodiment.

It is the top view which notched a part showing typically a 1st embodiment of an absorptive article of the present invention. It is a figure which shows typically the principal part of the absorbent article of 1st Embodiment, (a) is an AA arrow expanded sectional view in FIG. 1, (b) is a BB arrow expanded sectional view, ( c) is an enlarged sectional view taken along the line CC. It is sectional drawing which shows typically the mounting state of the absorber in the collar part when mounting | wearing the absorbent article of 1st Embodiment. FIG. 3 is a plan view (corresponding to FIG. 1) with a part cut away schematically showing a second embodiment of the absorbent article of the present invention. It is a figure which shows typically the principal part in 2nd Embodiment of the absorbent article of this invention, (a) is an AA arrow expanded sectional view equivalent view in FIG. 4, (b) is a BB arrow view. FIG. 4C is an enlarged cross-sectional view equivalent view, and FIG. FIG. 5 is a plan view (corresponding to FIG. 1) with a part cut away schematically showing a third embodiment of the absorbent article of the present invention. FIG. 5 is a plan view (corresponding to FIG. 1) with a part cut away schematically showing a fourth embodiment of the absorbent article of the present invention. It is the top view (figure 1 equivalent figure) which notched a part showing typically a 5th embodiment of an absorptive article of the present invention.

Explanation of symbols

1, 1 'sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 2 Skin contact surface 3 Non-skin contact surface 4 Absorber 40 Absorbent paper 41 1st absorption part 42 2nd absorption part 43 Separation part 44 Boundary part 5 Wing flap 6 Rear part flap

Claims (5)

An absorbent article comprising a top sheet, a back sheet, and an absorber interposed between both sheets,
The absorber is arranged on both sides of a first absorption part that is arranged from the front part to the rear part and that has a narrow width toward the rear in the rear part, and a narrow part of the first absorption part. A second absorption part,
The first absorption part and the second absorption part on both sides are independent,
A separating portion is provided between the first and second absorbing portions and the second absorbing portion, the separating portions being separated from each other,
The rear end portion of the first absorption part is positioned forward of the rear end portion of the second absorption part, the distance between the rear end portion of the rear end portion of the first absorption part and the second absorption part (D1) Is 5 to 100 mm,
The absorptive article by which the top sheet and the back sheet are joined in the space part.   The wing flap which is folded back to the non-skin contact surface side and fixed to the underwear at the time of wearing is provided, and the second absorption portion is arranged so that the front end portion is accommodated between the wing flaps. The absorbent article as described. The absorbent article according to claim 1 or 2 , wherein the liquid absorption capacity of the second absorbent part is 40 to 100% of that of the first absorbent part. The absorptive article given in any 1 paragraph of Claims 1-3 in which said spacing part provided between said 1st absorption part and said 2nd absorption part is curving. The distance (D2) between the second absorbent parts in the rear part of the absorbent article is larger than the distance (D1) between the rear end part of the first absorbent part and the rear end part of the second absorbent part. The absorbent article according to any one of claims 1 to 4 , wherein the one is formed longer.

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