JP4136270B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article, and more particularly to an absorbent article that is particularly suitably used as a disposable diaper, a sanitary napkin, a cage sheet, an incontinence pad, and the like.
[0002]
[Prior art and problems to be solved by the invention]
For the purpose of imparting various functions to the absorbent article, it is known that the absorbent body in the absorbent article contains various functional powders. For example, it is known to contain a deodorant or an fragrance in order to suppress malodor generated from excreted body fluid.
[0003]
However, when these functional powder particles are dispersed by the wearer's movement during wearing of the absorbent article, or the absorbent article is deformed by the movement, the functional powder is dropped from the absorbent body due to this. There is a case. As a result, the desired function may not be fully exhibited. In particular, when the functional granular material is a dark product such as activated carbon, the appearance and impression of the absorbent article are deteriorated by dropping from the absorbent.
[0004]
Accordingly, an object of the present invention is to provide an absorbent article provided with an absorbent layer containing functional powder particles, in which the functional powder particles are prevented from falling off the absorbent layer. It is in.
[0005]
[Means for Solving the Problems]
The present invention relates to an absorbent article comprising a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retaining absorbent layer that is interposed between both layers and has a substantially vertically long shape. Are interposed between the absorbent core, the fall-off prevention sheet disposed on at least the skin contact surface side of the absorbent core, and the absorbent core and the fall-off prevention sheet, and are disposed on the absorbent article in a predetermined manner. It has a functional sheet containing a functional granular material that imparts a function, and the absorbent core and the anti-drop sheet extend from front and rear ends in the longitudinal direction of the absorbent layer of the functional sheet. The extended absorbent core and the anti-drop sheet are joined or abutted to each other so that the functional powder particles do not fall off from the front and rear ends of the absorbent layer, and the functional sheet The functional powder in the inside is predetermined By providing an absorbent article it has been made so as not to fall off from the right and left sides of the absorbing layer by means, in which to achieve the above object.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
The disposable diaper 1 according to the first embodiment has a vertically long shape as shown in FIGS. 1 to 4, and includes a top sheet 21 constituting a liquid-permeable surface layer and a back surface constituting a liquid-impermeable back layer. The sheet 22 and the absorbent body 10 as a liquid retaining absorbent layer interposed between the top sheet 21 and the back sheet 22 are provided.
[0007]
The disposable diaper 1 of the present embodiment is worn together with wearing equipment such as underwear and a diaper cover, and the topsheet 21 and the backsheet 22 extend outward from the periphery of the absorbent body 10 and extend. In the portion, both sheets 21 and 22 are joined by a predetermined joining means such as heat sealing or ultrasonic sealing. The absorbent body 10 is sandwiched and fixed between the sheets 21 and 22 so that the longitudinal direction thereof coincides with the longitudinal direction of the diaper 1. Further, the top sheet 21 and the back sheet 22 extending from the left and right side edges of the absorbent body 10 are bonded and fixed to each other, so that a pair of side flaps 23, 23 are provided on the left and right side parts of the diaper across the longitudinal direction of the diaper 1. Is formed. An elastic elastic member 24 is disposed along the longitudinal direction of the side flap 23 at a substantially central portion in the longitudinal direction of the side flap 23.
[0008]
The side flaps 23 are folded back inwardly (that is, on the surface sheet 21 side) in the longitudinal rear portion of the diaper 1 to form a first folded portion 25, and further, the side flaps constituting the first folded portion 25 are A second folded portion 26 is formed by folding outward. The first folded portion 25 is bonded and fixed to the top sheet 21, and the second folded portion 26 is bonded and fixed to the first folded portion 25.
[0009]
An adhesive region (not shown) for fixing the disposable diaper 1 to the wearing tool is provided on the back side of the back sheet 22 and is protected with a release sheet before use. In addition, as the surface sheet 21, various nonwoven fabrics, what perforated this, a perforated film, etc. are used. As the back sheet 22, a film or the like made of a thermoplastic resin and having or not having moisture permeability is used. In addition, as the pressure-sensitive adhesive for forming the pressure-sensitive adhesive region and the release sheet, various types conventionally used for absorbent articles are used.
[0010]
As shown in FIGS. 1 to 4, the absorbent body 10 includes an absorbent core 11 including a fiber material, a fall-off prevention sheet 12 disposed on at least the skin contact surface P side of the absorbent core 11, and the absorbent core. 11 and the fall prevention sheet 12, and is composed of a functional sheet 13 containing functional powder particles that impart a predetermined function to the diaper 1.
[0011]
The absorptive core 11 is a part holding the body fluid absorbed from the skin contact surface, and is composed of a fiber assembly and / or a water-absorbing polymer. The arrangement of the fiber aggregate and the water-absorbing polymer is not particularly limited, but the absorbent core 11 in the first embodiment is composed of an absorbent sheet 17 composed of the fiber aggregate and a superabsorbent polymer 18. . The absorbent sheet 17 has a two-layer structure in which both side portions along the longitudinal direction of the diaper 1 are folded back to the non-skin contact surface Q side and laminated at the center portion. A water-absorbing polymer 18 is sandwiched and fixed.
[0012]
As the fiber material constituting the fiber assembly, for example, natural fibers such as wood pulp and cotton, and cellulosic fibers such as regenerated cellulose such as rayon and cupra are preferable, and filaments or staple fibers of thermoplastic fibers can also be used. . The fiber assembly may be paper or non-woven fabric.
As the water-absorbing polymer, various conventionally known polymers can be used, but those capable of absorbing and holding a liquid 20 times or more of its own weight and capable of gelling are preferable.
[0013]
The drop-off prevention sheet 12 is a sheet that prevents the functional powder particles in the functional sheet 13 from dropping from the absorbent body 10. The fall-off prevention sheet 12 is a sheet made of a fiber material such as paper, a pulp sheet, and a nonwoven fabric, and is liquid permeable. When the forming material of the sheet 12 is not hydrophilic or when the degree of hydrophilicity is low, it is preferable to perform a predetermined hydrophilic treatment.
In the fall-off prevention sheet 12 in the first embodiment, the central portion located in the center in the width direction of the absorbent body 10 covers the entire surface of the absorbent core 11 on the skin contact surface P side, and is along the longitudinal direction of the absorbent body 10. Both side portions are arranged so as to cover both side portions of the absorbent core 11 and to be located on the non-skin contact surface Q side of the absorbent core 11.
[0014]
The functional sheet 13 is a sheet containing a functional granular material that imparts a predetermined function to the diaper 1.
Functional powders contained in the functional sheet include deodorants (including deodorants), antibacterial agents, fragrances, thermal exothermic agents, etc., and appropriate functionality depending on the required performance of the diaper 1 Powder particles are used.
The functional powder is often colored in black, brown, yellow or the like, and when such a functional powder is used, the color of the functional powder is the surface sheet 2. Inconvenience may occur that the appearance and impression of the diaper are reduced. In the present invention, such a disadvantage is avoided by providing the anti-drop sheet 12 on the skin contact surface P side of the functional sheet 13. Thus, in the present invention, the functional powder particles are prevented from falling off, and when the functional powder particles are colored, the effect of shielding the color is also exhibited. The color shielding effect is remarkably exhibited when the lightness of the color is higher than the color of the material of the absorbent core and the top sheet constituting the absorbent article.
[0015]
The functional sheet 13 is interposed between the absorbent core 11 and the anti-drop sheet 12.
The functional sheet 13 in the first embodiment covers the skin contact surface P side, both side portions, and the non-skin contact surface Q side of the absorbent core 11 excluding the front and rear end portions of the absorbent core 11. The entire outer surface of the functional sheet 13 is covered with the anti-falling sheet 12.
[0016]
In the functional sheet 13 in the first embodiment, a deodorant-containing sheet 16 containing a deodorant as the functional granular material is interposed between two identical or different pulp sheets 14 and 15. It is an odorous laminated sheet. By using such a laminated sheet, it is possible to reliably prevent the functional powder particles from leaking to the skin contact surface P, and the color shielding effect is further improved.
[0017]
The deodorant-containing sheet 16 in the laminated sheet 13 is mainly composed of deodorant powder and fiber raw materials.
As the deodorant, for example, activated carbon, zeolite, amorphous silica, bentonite, activated alumina, activated clay and the like are used. One or two or more deodorants can be used. The content of the deodorant in the deodorant-containing sheet 16 is 1 to 50% by weight, particularly 3 to 30% by weight with respect to the weight of the sheet 16, and a sufficient deodorizing effect is expressed. In view of securing sufficient sheet strength and flexibility. As a fiber raw material, known natural fibers such as non-wood pulp such as straw and cotton can be used in addition to wood pulp such as NBKP and LBKP. Further, for the purpose of improving the sheet strength, synthetic fibers such as polyethylene fibers may be appropriately mixed. The content of the fiber raw material in the deodorant-containing sheet 16 is 50 to 99% by weight, particularly 70 to 97% by weight with respect to the weight of the sheet 6, and a sufficient deodorizing effect is expressed. This is preferable from the viewpoint of securing sufficient sheet strength and flexibility.
[0018]
Both pulp sheets 14 and 15 are sheets mainly composed of pulp, which may be the same or different, and are formed by either a wet papermaking method or a dry papermaking method. May be.
One pulp sheet 14 is in close contact with the drop-off prevention sheet 12, and the other pulp sheet 15 is in close contact with the absorbent core 11.
The pulp sheet 14 on the slip-off preventing sheet 12 side has a basis weight of 12 to 30 g / m ² , particularly 15 to 20 g / m ² , and is outside the laminated sheet without impairing the texture and liquid absorbability of the sheet. It is preferable from the viewpoint of preventing the deodorant from leaking into and preventing the appearance from being deteriorated by the deodorant.
[0019]
As shown in FIGS. 1 to 3, the absorbent core 11 and the drop-off prevention sheet 12 extend from the front and rear ends 13 a and 13 a of the functional sheet 13 in the longitudinal direction of the absorbent body 10, The anti-drop sheet 12 is joined or abutted to each other. With such a configuration, the leakage of the functional powder particles from the front and rear ends 13a, 13a of the functional sheet 13 can be suppressed, and even if the functional powder particles leak from the functional sheet 13, the movement thereof Therefore, it is possible to prevent the functional granular material from leaking out from the front and rear ends 10a, 10a in the longitudinal direction of the absorbent body 10.
The absorbent core 11 extending from the front and rear ends 13a and 13a of the functional sheet 13 and the drop-off prevention sheet 12 may be in contact with each other, but are preferably joined together. Adhesives such as heat seal, ultrasonic seal, and hot melt adhesive can be used.
[0020]
The distance that the absorbent core 11 and the drop-off prevention sheet 12 extend from the front and rear ends 13a, 13a of the functional sheet 13 may be the same or different between the absorbent core 11 and the drop-off prevention sheet 12, and The front end and the rear end may be the same or different. From the standpoint of preventing the functional granular material from falling off from the front and rear ends 10a and 10a of the absorbent body 10, the absorbent core 11 and the dropout are respectively provided at the front and rear ends. The extension distance L1 of the prevention sheet 12 is preferably 0.5 cm or more, particularly 1.0 cm or more.
[0021]
The basis weight of the slip-off preventing sheet 12 is preferably 12 g / m ² or more, and particularly preferably 15 g / m ² or more from the viewpoint of preventing the functional granular material from falling off.
[0022]
Further, the sheet 12 for drop-off prevention has a Gurley air permeability (JIS P8117) of 0.5 to 30.0 seconds, particularly 1.0 to 10 seconds, while preventing the functional granular material from falling off. It is preferable because it does not impair the absorbability of the absorber.
[0023]
In the diaper 1 of the first embodiment, the functional powder particles in the functional sheet 13 are prevented from dropping off from the left and right sides 10c, 10c in the longitudinal direction of the absorbent body 10 by a predetermined means.
In the first embodiment, first, the slip-off preventing sheet 12 covers the functional sheet 13 on both sides of the absorbent core 11, and both sides thereof are on the non-skin contact surface Q side of the absorbent core 11. It arrange | positions so that it may be located, and both sides 12b and 12b of the sheet | seat 12 for drop-off prevention are mutually overlap | superposed on the non-skin contact surface Q side of the absorptive core 11. FIG. By adopting such a configuration (first means), it is possible to prevent the functional powder particles from leaking out from the left and right sides in the longitudinal direction of the absorbent body 10.
[0024]
Further, the functional sheet 13 is a laminated sheet in which a deodorant-containing sheet 16 containing a deodorant as the functional powder is interposed between two identical or different pulp sheets 14 and 15. Thus, a laminated sheet in which the deodorant-containing sheet 16 is not interposed over the entire side portions 13b and 13b along the longitudinal direction of the absorbent body 10 is used (second means).
[0025]
The laminated sheet as the functional sheet 13 will be further described. The width of the deodorant-containing sheet 16 in the laminated sheet 13 is smaller than the width of the pulp sheets 14 and 15. The left and right side portions 13b and 13b of the laminated sheet 13 have a two-layer structure in which two pulp sheets 14 and 15 extending outward from the left and right side edges of the deodorant-containing sheet are joined to each other by an adhesive. The deodorant-containing sheet 16 is not interposed between the left and right side portions 13b and 13b of the laminated sheet 13 over the whole. By using the laminated sheet 13 in which the deodorant-containing sheet 16 is not interposed over the entire sides or one side, the deodorant is effectively removed from both side ends of the deodorant-containing sheet 16. Is prevented.
[0026]
When the deodorant-containing sheet 2 is not interposed only in one side portion of the laminated sheet 13 and the deodorant-containing sheet 2 is interposed in the other side portion, Place on top of the side and overlap. The width of the side portion 13b in which the deodorant-containing sheet 16 is not interposed is preferably 0.1 to 20 cm, particularly 1 to 6 cm.
Note that the length of the deodorant-containing sheet 16 in the direction along the longitudinal direction of the absorbent body 10 is the same as the length of the pulp sheets 14 and 15 in the same direction. The end surface of the containing sheet 16 is exposed.
[0027]
The disposable diaper of 2nd Embodiment of this invention is demonstrated. The diaper of 2nd Embodiment has the structure similar to 1st Embodiment except using the absorber 10 'of the structure shown in FIG. 5 instead of the absorber 10 of the diaper 1 of 1st Embodiment. Therefore, hereinafter, differences from the first embodiment will be mainly described, and the description described above with respect to the first embodiment is applied to points that are not particularly described.
[0028]
As shown in FIG. 5, the absorbent body 10 ′ in the disposable diaper of the second embodiment is a flat sheet body in which the absorbent core 11, the functional sheet 13, and the anti-drop sheet 12 are laminated in this order, The falling prevention sheet 12 side is disposed on the front sheet 21 side, and the absorbent core 11 side is disposed on the back sheet 22 side.
[0029]
In the second embodiment, the absorbent core 11 and the drop-off prevention sheet 12 extend from the front and rear ends 13a and 13a of the functional sheet 13 and the left and right ends 13c and 13c of the functional sheet, respectively. The extended absorbent core 11 and the drop-off preventing sheet 12 are joined to each other by an adhesive 17 in each of a portion extended from 13a, 13a and a portion extended from the left and right side ends 13c, 13c.
Various adhesives conventionally used for absorbent articles such as diapers and napkins can be used as the adhesive 17 for joining both sheets. For example, hot melt adhesives, emulsion adhesives, water-soluble adhesives can be used. An agent or the like can be used.
The adhesive application pattern may be an arbitrary pattern such as a continuous linear shape, a dot shape, or a spiral shape. Note that, instead of the adhesive, heat sealing, ultrasonic sealing, or the like may be used as the joining means.
[0030]
The functional sheet 13 in the second embodiment is a sheet having a three-layer structure in which a deodorant-containing sheet is interposed between two identical or different pulp sheets, similarly to the laminated sheet of the first embodiment. It is a laminated sheet in which the deodorant-containing sheet is not interposed in the entire both sides in the longitudinal direction. The absorptive core 11 consists of an absorptive sheet which hold | maintained the superabsorbent polymer in the interfiber gap | interval in a sheet-like fiber assembly.
[0031]
Since the diaper of 2nd Embodiment has such a structure, the effect similar to 1st Embodiment is show | played.
For example, also in the absorbent body 10 ′ of the second embodiment, the absorbent core 11 and the drop-off prevention sheet 12 extend from the front and rear ends 13a, 13a of the functional sheet 13 in the longitudinal direction of the absorbent body 10 ′, and extend. Since the absorbent core 11 and the drop-off prevention sheet 12 are joined to each other, the leakage of the functional granular material from the front and rear ends 13a and 13a of the functional sheet 13 can be suppressed. Even if the functional granular material leaks out, the movement can be inhibited or suppressed, so that the functional granular material can be prevented from leaking out from the front and rear ends 10a, 10a in the longitudinal direction of the absorbent body 10.
Further, the absorbent core 11 and the drop-off prevention sheet 12 extend from the left and right side ends 13c, 13c of the functional sheet 13, and the absorbent core 11 and the drop-off prevention sheet extend from the left and right side ends 13c, 13c. Since 12 is mutually joined, it can prevent that the functional granular material in the functional sheet 13 leaks from right-and-left both sides 10c and 10c of absorber 10 'similarly.
[0032]
The disposable diaper of 3rd Embodiment of this invention is demonstrated. The diaper of the third embodiment is the top sheet of the diaper 1 of the first embodiment by cutting the functional sheet 13 in the absorbent body 10 along the width direction of the absorbent body 10 as shown in FIG. The body fluid which permeate | transmitted 21 forms the high absorption part R in which the absorptive core 11 is easy to be absorbed rather than another part.
[0033]
By forming such a high absorption part R, inconveniences that occur when the liquid permeability of the functional sheet 13 is low, for example, the absorption performance of the absorbent article becomes insufficient, or stickiness occurs due to liquid return. This can be prevented. The position where the high absorption portion R is provided, the number of the high absorption portions provided, the width W of the gap S between the functional sheets 13 in the high absorption portion R, respectively, and the deodorizing function that the functional sheet 13 gives to the diaper. Can be determined as appropriate in consideration of the balance between the function and the absorption performance. The cut end surfaces of the functional sheet 13 in the high absorption portion R may be separated as shown in FIG. Furthermore, a part may overlap.
Regarding the diaper of the third embodiment, points that are not particularly described are the same as those of the diaper of the first embodiment, and according to the third embodiment, the same operational effects as the first embodiment are exhibited.
[0034]
The present invention is not limited to the first to third embodiments. For example, the absorbent core may be composed of only a fiber assembly or may be formed by covering the entire fiber assembly and the superabsorbent polymer with paper or non-woven fabric. Further, the means for preventing the functional powder particles in the functional sheet from falling off from both the left and right sides of the absorbent layer may be any means as long as it can prevent the absorbent layer from falling off from the left and right sides. Either one of the first and second means may be used, or a means for sealing the left and right ends of the functional sheet by bonding as in the second embodiment.
[0035]
The absorbent article of the present invention is not limited to disposable diapers, and can also be applied to sanitary napkins, cage sheets, incontinence pads, and the like.
[0036]
【The invention's effect】
According to the absorbent article of the present invention, it is possible to prevent the functional powder particles from dropping from the absorbent layer containing the functional powder particles, particularly from the front and rear ends of the absorbent layer.
[Brief description of the drawings]
FIG. 1 is a perspective view of a disposable diaper according to a first embodiment of the present invention, partially broken away.
FIG. 2 is a plan view showing a state in which an absorbent body in the diaper of the first embodiment is viewed from the skin contact surface side.
FIG. 3 is a cross-sectional view illustrating a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view showing a part of the cross section taken along line BB in FIG.
FIG. 5 is an exploded perspective view showing an absorbent body in a diaper according to a second embodiment in an exploded manner.
FIG. 6 is a cross-sectional view (corresponding to FIG. 3) in which a part of the cross section along the longitudinal direction of the absorbent body in the diaper of the third embodiment is omitted.
[Explanation of symbols]
1 disposable diaper (absorbent article)
10 Absorber (absorbing layer)
DESCRIPTION OF SYMBOLS 11 Absorbent core 12 Drop-off prevention sheet 13 Functional sheet 13a, 13a Front and rear ends 14, 15 of functional sheet Pulp sheet 16 Deodorant-containing sheet 21 Surface sheet (surface layer)
22 Back sheet (back layer)
X Longitudinal direction of absorber (absorber)

Claims (4)

In an absorbent article comprising a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retaining absorbent layer that is interposed between both layers and has a substantially vertically long shape,
The absorbent layer is interposed between the absorbent core, the fall-off prevention sheet disposed at least on the skin contact surface side of the absorbent core, and the absorbent core and the fall-off prevention sheet. Having a functional sheet containing functional granules that impart a predetermined function to
The absorbent core and the fall-off prevention sheet extend from front and rear ends in the longitudinal direction of the absorbent layer of the functional sheet, and the extended absorbent core and the fall-off prevention sheet are joined or abutted to each other. And the functional powder is prevented from falling off from the front and rear ends of the absorbent layer,
The functional sheet covers the skin contact surface side of the absorbent core and both side portions of the absorbent core, and both side portions of the functional sheet are positioned on the non-skin contact surface side of the absorbent core. Is arranged, and
The fall prevention sheet covers the functional sheet on both sides of the absorbent core, and both sides of the fall prevention sheet are located on the non-skin contact surface side of the absorbent core. An absorbent article that is disposed and has both side portions of the drop-off prevention sheet overlapped with each other so that the functional powder particles do not fall off from the left and right sides of the absorbent layer . The functional particulate material is, deodorants, antimicrobial agents, absorbent article of claim 1 wherein the fragrance or the exothermic agent. The functional sheet is a laminated sheet in which a deodorant-containing sheet containing a deodorant as the functional powder is interposed between two identical or different pulp sheets, and the laminated sheet is The absorbent article according to claim 1 or 2, wherein the deodorant-containing sheet is not interposed over at least one side portion along the longitudinal direction of the absorbent layer. The absorbent article according to any one of claims 1 to 3 , wherein the absorbent layer has a high absorbent portion formed by cutting the functional sheet along the width direction of the absorbent layer.

Images