JP4963906B2 - 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.

Conventionally, in an absorbent article such as a sanitary napkin, it is possible to improve lateral leakage prevention by forming a three-dimensional barrier that prevents movement of the liquid in the lateral direction on both sides in the longitudinal direction on the skin contact surface side. Widely done.
For example, in Patent Document 1, barrier flaps provided on both side portions in the longitudinal direction are constituted by an elastic stretchable part and non-stretchable parts positioned before and after the elastic stretchable part, and cross the elastic stretchable part. A sanitary napkin containing a single bag folded in the longitudinal direction along a folding line is described.
Further, in Patent Document 2, one side edge side of the liquid barrier sheet for forming the wing portion is arranged on the surface sheet, and the barrier sheet is disposed at a position separated from the one side edge. A sanitary napkin is proposed in which a leak-proof pocket is formed between the barrier sheet and the top sheet.

JP-A-8-660 Japanese Utility Model Publication No. 5-51328

When the napkin described in Patent Document 1 is taken out from the individual bag, since the folding line is formed in the width direction, the elastic stretchable part easily contracts and the barrier flap rises well. However, the folding crease caused by the fold curve remains in almost the entire area in the width direction of the napkin, creating a gap between the crease part and the body when worn, creating a path through which liquid flows in the lateral direction, causing leakage. It becomes easy. In addition, since the barrier flap rises due to the contraction of the elastic member stuck in the extended state, the barrier flap portion presses the body when worn, and both sides of the napkin tend to give the wearer a sense of incongruity. is there. Further, in the manufacturing process, it is necessary to stick the elastic member in an extended state, which is not preferable for reducing the material used and the manufacturing cost.
Further, in the napkin described in Patent Document 2, there is a possibility that the function of the pocket is not sufficiently exhibited because the barrier sheet and the surface sheet are not sufficiently separated.

  Accordingly, an object of the present invention is to provide an absorbent article that does not give the wearer a sense of incongruity and that easily opens a leak-proof pocket when the absorbent article is used.

  The present invention relates to a vertically long absorbent main body provided with an absorbent layer and a leak-proof layer, a pair of side leak-proof sheets disposed on both side portions on the skin contact surface side of the absorbent main body, and the absorbent main body An absorbent article having a pair of wings extending outward in the width direction from the pair of side leakage prevention sheets and the absorbent layer, between the absorbent layer and the central side in the width direction of the absorbent main body. A leak-proof pocket that is open toward the surface is formed, and the absorbent main body has a high-rigidity region that is higher in rigidity than the portions located on both sides at the center in the width direction. The above object is achieved by providing an absorbent article that is wrapped in a longitudinal direction along a folding line that crosses all of the pocket, the wing portion, and the high-rigidity region.

  The absorbent article of the present invention does not give the wearer a sense of incongruity, and the leakproof pocket is easily opened when the absorbent article is used.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
A sanitary napkin 1 (hereinafter also simply referred to as a napkin 1) according to an embodiment of the present invention has a vertically long absorbent main body 11 including an absorbent layer 12 and a leak-proof layer 16, as shown in FIGS. And a pair of side leak-proof sheets 15, 15 disposed on both side portions on the skin contact surface side of the absorbent main body 11, and a pair of sides extending outward in the width direction from both side edges of the absorbent main body It has wing parts 2 and 2. The napkin 1 has an excretion part facing part A that is disposed to face the excretion part of the wearer when worn, and a front part B and a rear part C that extend before and after the excretion part facing part A. When the napkin 1 is worn, the front part B is arranged on the front (belly) side of the wearer, and the rear part C is arranged on the back (back) side of the wearer. A pair of wing parts 2 and 2 are formed in the both sides of the absorptive main body 11 in the excretion part opposing part A. As shown in FIG.

The absorbent layer 12 is composed of a liquid-permeable top sheet 13 and a liquid-retaining absorbent body 14, and the leak-proof layer 16 is composed of a liquid-impermeable (concept including poor permeability) back sheet. Since the leak-proof layer 16 in this embodiment consists only of a back surface sheet, the same code | symbol 16 is attached | subjected to both.
The absorber 14 is sandwiched between the top sheet 13 and the back sheet 16 and integrated therewith.

The pair of side leak-proof sheets 15, 15 are arranged along the longitudinal direction of the absorbent main body 11 on both side portions on the skin contact surface side of the absorbent main body 11.
Each of the side leak-proof sheets 15 and 15 has an area having a predetermined width from one side edge 15a (hereinafter also referred to as an inner edge) located on the widthwise center side of the absorbent main body 11 and both side portions of the topsheet 13. As shown in FIG. 2, the top sheet 13 is joined to the top sheet 13 by a known joining means such as heat sealing at a position spaced from the inner edge 15a in the direction of the other side edge 15b.

As shown in FIG. 1, the center in the width direction of the absorbent main body 11 is located at the same position as the formation position of the wing portions 2, 2 in the longitudinal direction of the napkin 1 by joining the side leak-proof sheet 15 and the surface sheet 15. A pair of joining lines 3 and 3 having a concavely curved shape toward the side are formed.
Each of the pair of joining lines 3 and 3 has both end portions 31 and 32 in the vicinity of the inner edge 15a of the side leak-proof sheet 15, and between the both end portions 31 and 32 has a substantially arc shape. ing. The length between both end portions 31 and 32 of each joining line 3 is preferably about 10 to 50% of the total length of the napkin 1.

  As shown in FIG. 2, the side leakage preventing sheet 15 is not joined to the top sheet 13 between the inner edge 15 a and the joining line 3, thereby the side leakage preventing sheet 15 and the top sheet 13. In between, the leakage prevention pockets 4 and 4 which open toward the width direction center side of an absorptive main body are formed. The leak-proof pocket 4 is not substantially opened in the packaged napkin 1, but, as shown in FIG. 2, in the state where it is taken out from the package and fixed to underwear such as shorts, it absorbs. Opening toward the center in the width direction of the main body 11, menstrual blood or the like that has moved in the width direction of the napkin is captured. The leak-proof pocket in the present invention only needs to be open toward the center in the width direction of the absorbent main body when the absorbent article is used (weared). Moreover, it is not necessary to always open at the time of use (wearing) of an absorbent article, and opening and closing may be repeated with the increase / decrease in the pressure received from a wearer.

As shown in FIG. 2, the absorbent main body 11 has a high-rigidity region 11 </ b> H having higher rigidity than the portions 11 </ b> L and 11 </ b> L (also referred to as low-rigidity regions) located on both sides of the central portion in the width direction. Yes.
And the napkin 1 of this embodiment is a folding line which crosses all of a pair of leak-proof pockets 4 and 4, a pair of wing parts 2 and 2, and the highly rigid area | region 11H of the absorptive main body 11, as shown in FIG. It is packaged in a state of being folded in the longitudinal direction along L1 and L2.

The wrapping state napkin 1 will be further described. The wing portions 2 and 2 are folded in the napkin width direction along the folding line LW extending in the longitudinal direction of the napkin 1 and are overlapped on the skin contact surface side of the absorbent main body 11. ing. The adhesive portions 23 of each of the pair of wing portions 2 bent to the skin contact surface side of the absorbent main body 11 are covered with release paper (not shown).
The napkin 1 is bent in the longitudinal direction along four folding lines L to L4 that are folding lines crossing the napkin 1 in the width direction. The wing part 2 is bent to the skin contact surface side of the absorbent main body 11 before bending along the folding lines L1 and L2.

The direction of the folding of the napkin 1 by the folding lines L1 to L4 is the direction in which the back sheet 16 side is a mountain and the top sheet 13 side is a valley, and the folding order at the time of folding by the folding lines L1 to L4 Are in the order of L3, L4, L1, and L2. When folding along the folding lines L4, L1, and L2, the packaging material 5 is arranged on the non-skin contact surface side of the napkin 1 as shown in phantom lines in FIG. Are bent together. The portions of the packaging material 5 that extend from both side edges of the folded napkin 1 are sealed by heat sealing, and the end portions of the packaging material in the longitudinal direction are fastened to the opposite surfaces by the tab tape 6.
Conventionally, absorbent articles such as sanitary napkins are usually packaged (individually packaged) individually with a packaging material in a state of being folded in the longitudinal direction, and are commercially available. A material, a packaging method, and the like can be the same as those of a conventional individually packaged absorbent article.

As described above, the napkin 1 of the present embodiment has the folding lines L1 and L2 that cross all of the pair of leak-proof pockets 4 and 4, the pair of wing portions 2 and 2, and the high-rigidity region 11H of the absorbent main body 11. And is folded in the longitudinal direction along the folding direction, and the folding direction in the folding lines L1 and L2 is a direction in which the non-skin contact surface side of the napkin 1 is a mountain. In the side leak-proof sheet 15 that forms the upper wall, the portion bent by the folding lines L1 and L2 is provided with a firm and strong folding line. Therefore, when the napkin 1 is used, when the napkin 1 is spread out on the skin-facing surface of the underwear or the like in a flat shape, the portion B with the crease is shown in FIGS. 3 and 4. In addition, it is easy to maintain a bent state.
On the other hand, a low-rigidity region 11L of the absorbent main body 11 is located under the portion B with the folding gusset, and the low-rigidity region 11L is originally difficult to fold due to low rigidity. The low-rigidity region 11L has a lower height than the high-rigidity region 11H, and therefore is bent with a gentler curvature than the high-rigidity region 11H. In the low-rigidity region 11L of the absorbent main body 11, Compared to the high-rigidity region 11H, it is difficult to bend. Moreover, since the side leak-proof sheet 15 is folded at the inner surface from the low-rigidity region 11L, it is easy to be folded. Therefore, when the napkin 1 is used, when the napkin 1 is spread on the skin-facing surface of the underwear or the like in a flat shape, the bent portion 11B is as shown in FIG. 3 and FIG. Moreover, it becomes a relatively flat state.

Thus, while the side leak-proof sheet 15 is easy to maintain the bent state due to folding, the low-rigidity region 11L of the absorbent main body located therebelow becomes relatively flat, so that the leak-proof pocket 4 is formed. Easy to open.
Moreover, since the folding lines L1 and L2 exist at substantially the same position as the formation position of the wing part 2 in the longitudinal direction of the napkin 1, the wing parts 2 and 2 are bent along the side edges of the crotch part of the underwear, When fixed to the non-skin facing surface of the underwear via the adhesive portion 23, the pressure P from the underwear is applied relatively strongly to the bent portion 11B of the absorbent main body 11, so that the portion 11B is further flattened. It is easy to be extended to. Thereby, the leak-proof pocket 4 becomes easier to open, and when the napkin 1 is used, the leak-proof pocket 4 opens sufficiently and reliably, and excellent leak-proof performance is obtained.
Note that the non-skin facing surface of the underwear is typically the outer surface of the underwear, but is provided so that the crotch part forms an outer surface of the shorts and a part thereof is spaced apart from the outer layer sheet. In those having a double structure with the mounting portion, the surface on the outer layer sheet side of the mounting portion is the non-skin facing surface of the underwear.

  Further, in the present embodiment, since the leakproof pocket is opened due to the difference in the ease of folding, the leakproof pocket 4 is compared with the case where the leakproof pocket is opened by contraction of the elastic member. It feels soft against the skin, and there is no need to fix the elastic member in the stretched state during production. Furthermore, since the both side parts of the absorptive main body 11 are made lower rigid than the width direction center part, it is hard to give a wearer an uncomfortable feeling.

  Further, the absorbent main body 11 has a high-rigidity region 11H at the center in the width direction, and the portion 11H is easily bent by the folding lines L1 and L2, so the napkin 1 is expanded and put on underwear. When the portion 11H is fixed, a valley-like dent C extending in the width direction is likely to be generated on the surface of the napkin 1 due to the folding of the portion 11H. , Leakage from the front and back of the napkin 1 can be prevented.

It is preferable that the side leak-proof sheet 15 is easily creased from the viewpoint of improving the opening of the leak-proof pocket 4 by the above-described action.
Specifically, the side barrier sheets 15 is preferably a density of 0.05~0.15g / cm ^3, more preferably 0.09~0.12g / cm ^3.
Moreover, as a forming material of the side leak-proof sheet 15, various known materials can be used. For example, a water-repellent nonwoven fabric or a resin film sheet is preferably used. In particular, it is preferable to use a water-repellent air-through non-woven fabric from the viewpoint of touch and prevention of lateral leakage. A laminate of a nonwoven fabric and a resin film can also be used. Thus, although the material excellent in touch and leak-proof property can be used, it is preferable to use the nonwoven fabric etc. which were formed by the spun bond method and the melt blown method from the point of the ease of attaching a crease. In addition, several sheets of such sheets may be used.

Further, from the same viewpoint, it is preferable that the side leakproof sheet 15 is partially increased in density by the embossing at the portion where the folding line L1 (L2) crosses.
Examples of the material of the side leak-proof sheet 15 in this case include a nonwoven fabric formed by a thermal fusion method, a hydroentanglement method, a needle punch method, a solvent adhesion method, a spun bond method, a melt blown method, or the like. The partial increase in density due to embossing forms a partially consolidated portion in such a nonwoven fabric to make the aggregate state of the fibers of the nonwoven fabric as a whole dense, and the folding line L1 (L2) crosses. This means that the part can be easily folded.

  The embossing pitch is preferably 3 to 10 mm from the viewpoint of ease of folding, and the embossing rate is preferably 5 to 20% from the viewpoint of touch. Further, the emboss may be formed by heat fusion, or two sheets may be used, an adhesive means such as hot melt is provided between the layers, and further embossed pressure treatment is performed to make it compact.

As shown in FIG. 2, the absorbent main body 11 in the napkin 1 of the present embodiment has a high rigidity region 11 </ b> H and low rigidity regions 11 </ b> L located on both sides thereof due to the difference in rigidity of the absorber 14.
As shown in FIG. 1, the absorbent body 14 in the napkin 1 according to the present embodiment has a shape that is long in the same direction as the front-rear direction when worn, and other parts in the longitudinal direction and the width direction. Thus, the absorbent sheet 7 to be configured has a high rigidity portion with a large number of layers and high rigidity.
When the napkin 1 is viewed in plan, the portion where the high-rigidity portion having high rigidity of the absorber is present is a high-rigidity region 11H of the absorbent main body 11, and other than the high-rigidity portion of the absorber. The portions where the portions (relatively low rigidity portions) exist are the low rigidity regions 11L and 11L of the absorbent main body 11.

  The absorbent body 14 in the high rigidity region 11H of the absorbent main body 11 has a structure in which the absorbent sheet 7 is laminated in four layers, and the absorbent body 14 in the low rigidity region 11L of the absorbent main body 11 is the absorbent sheet 7. Has a structure in which two layers are stacked. Specifically, the absorbent body 14 includes a two-layer wide absorbent sheet 7a extending over the entire area in the longitudinal direction and the width direction, and a narrow width disposed only in the central portion in the width direction of a part of the absorbent body 14 in the longitudinal direction. Between the two wide absorbent sheets in the high rigidity region 11H of the absorbent main body 11 and the narrow absorbent sheet 7b is folded in two layers. In the low rigidity region 11L of the absorbent main body 11, the narrow absorbent sheet 7b is not disposed.

The absorbent body 14 in the low-rigidity regions 11L, 11L (portions located on both sides of the high-rigidity region) of the absorbent main body 11 contains 30% by weight or more of bulky fibers in its constituent components, particularly 50-80. It is preferable to include the weight% because the low rigidity regions 11L and 11L are not easily folded and the openability of the leakproof pocket is further improved.
The bulky fiber is a fiber having a twisted structure, a crimped structure, a bent and branched structure, or a three-dimensional structure having a branched structure, or an extremely thick cross section (for example, a fiber roughness of 0.3 mg / or more).
As the bulky fibers, natural fibers, regenerated cellulose fibers, fibers obtained by hydrophilizing synthetic fibers such as PET, PE, PP are preferable, and these can be used in combination of two or more. It is preferable to use wood pulp from the viewpoint of absorbability and cost.
In addition, as a fiber used together with a bulky fiber, if it is a fiber which has a hydrophilic surface, it can use without a restriction | limiting in particular.

  Further, the absorber 14 in the low-rigidity regions 11L and 11L of the absorbent main body 11 slides between and / or inside the adjacent sheets in the thickness direction as compared with the absorber 14 in the high-rigidity region 11H of the absorbent main body 11. It is preferable that is likely to occur. With such a configuration, both sides of the absorbent main body 11 are less likely to be folded, and the leakage preventing pocket is more easily opened in relation to the side leakage preventing sheet that is relatively easily folded. The “sheet adjacent in the thickness direction” in the napkin 1 of the present embodiment is the top sheet 13 or the back sheet 16.

The absorbent body 4 in the napkin 1 of the present embodiment includes a two-layer wide absorbent sheet 7a disposed so as to extend over the entire width direction, and a narrow absorbent sheet 7b disposed only in the center in the width direction. In the high-rigidity region 11H of the absorbent main body 11, the two layers of the wide absorbent sheet 7a and the narrow absorbent sheet 7b are joined via the adhesive 8, and the absorbent main body In the 11 low-rigidity regions 11L and 11L (portions located on both sides of the high-rigidity region), the two wide absorbent sheets 7a are not joined. Thereby, the absorber 14 is more likely to slip inside than the absorber 14 in the high rigidity region 11H.
Instead of the configuration of the present embodiment, the two layers of the wide absorbent sheet 7a in the high rigidity region 11H and the narrow absorbent sheet 7b are firmly bonded, while the two layers in the low rigidity regions 11L and 11L The wide absorbent sheets 7a may be weakly bonded with different adhesive application patterns.

The napkin 1 of the present embodiment has a maximum thickness of 5 mm or less in a state where the napkin 1 is taken out from the package and developed. In particular, by suppressing the thickness of the high-rigidity region having the maximum thickness to 5 mm or less, it is possible to prevent a sense of incongruity from occurring in the vicinity of the excretory part facing part.
The thickness of the high rigidity region is preferably 1.5 to 5 mm, particularly preferably 2.0 to 3.5 mm. The thickness of the low rigidity region is preferably 0.5 to 3 mm, particularly preferably 1.0 to 2.0 mm.

  As shown in FIG. 5, a main body adhesive portion 9 is provided on the surface of the absorbent main body 11 of the napkin 1 according to this embodiment on the leak-proof layer 16 side. The main body adhesive portion 9 is in contact with the skin-facing surface of an underwear such as shorts and prevents positional displacement between the napkin 1 and the underwear. The main body adhesive portion 9 in the napkin 1 of the present embodiment is formed by intermittently forming a large number of strip-like adhesive portions 91, 91... Extending in the width direction of the absorbent main body 11 in the longitudinal direction of the absorbent main body 11. . In this way, by providing the main body adhesive portion 9, the product is flatly spread by being bonded and fixed to the shorts from the fold line formed by the fold line provided in the high-rigidity region 11H, and the fold line is completely removed. There is nothing to be done.

  The material which comprises each part of the napkin 1 of this embodiment is demonstrated. As the top sheet 13 and the back sheet 16, those usually used for this type of article can be used without particular limitation. For example, as the surface sheet 13, a hydrophilic and liquid-permeable nonwoven fabric or an apertured film can be used. As the back sheet 16, a liquid-impermeable material or a water-repellent material can be used. As the liquid-impermeable material, a resin film, a laminate material of a resin film and a nonwoven fabric, or the like can be used. As the water-repellent material, a multi-layer composite composed of spunbond, meltblown, spunbond, etc. Nonwoven fabrics, spunbonded nonwoven fabrics, heat bonded nonwoven fabrics, air-through nonwoven fabrics and the like can be used.

  As the absorbent sheets 7a and 7b constituting the absorbent body 4, an absorbent sheet carrying an absorbent polymer or pulp between two nonwoven fabrics or paper, an absorbent sheet described in JP-A-8-246395, or the like is used. Can be used. In addition, as the absorbent body, it is also possible to use a conventionally used fluff pulp pile or a mixed pile of fluff pulp and superabsorbent polymer particles coated with a water-permeable material such as tissue paper. it can.

The absorbent article of 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.
For example, the folding lines L1 and L2 that cross all of the leakage prevention pocket, the wing portion, and the high-rigidity region may be only one. For example, either L1 or L2 in the above embodiment may be omitted, or L1 Instead of L2 and L2, only one may exist at an intermediate position between them.
Further, instead of interposing the narrow absorbent sheet between the two layers of the wide absorbent sheet, the narrow absorbent sheet may be laminated on the surface sheet side or the back sheet side of the two layers of the wide absorbent sheet. it can. Also, instead of changing the rigidity of the high rigidity region and the low rigidity region due to the difference in the number of layers of the absorbent sheet arranged on each, the rigidity is made different depending on the difference in the basis weight of the absorber arranged on each. You can also. The difference in the number of layers when different depending on the number of layers of the absorbent sheet may be 1 or 3 or more.

  In addition, as a configuration in which the low rigidity regions 11L and 11L of the absorbent main body 11 are less likely to be folded, the absorber 14 in the low rigidity regions 11L and 11L of the absorbent main body 11 is replaced with the high rigidity region 11H of the absorbent main body 11. Slip may be more likely to occur between adjacent sheets (surface sheet and / or back sheet, etc.) in the thickness direction than the absorbent body 14. As a specific example, the adhesive coating pattern for adhering the absorbent body 14 and the top sheet 13 is a dense pattern in the high-rigidity region 11H, while relatively low in the low-rigidity regions 11L and 11L. A sparse pattern is mentioned. Examples of the combination of the dense pattern and the sparse pattern include full-surface coating and pattern coating such as a spiral, and a pattern in which the stripe interval of the stripe pattern is dense and a pattern in which the stripe interval of the stripe pattern is sparse.

  In addition to the sanitary napkin, the absorbent article of the present invention may be a panty liner (orimono sheet), an incontinence pad, or the like.

FIG. 1 is a plan view showing a sanitary napkin according to an embodiment of the present invention as viewed from the surface sheet side. 2 is an enlarged sectional view taken along line II-II in FIG. FIG. 3 is a perspective view showing a state in which a leak-proof pocket is opened in a worn state. 4 is a cross-sectional view taken along line III-III in FIG. FIG. 5 is a plan view showing the sanitary napkin of FIG. 1 as viewed from the back sheet side.

Explanation of symbols

1 Sanitary napkin (absorbent article)
11 Absorbent body 11H High rigidity area 11L Low rigidity area (portions located on both sides of the high rigidity area)
12 Absorbent layer 13 Top sheet 14 Absorber 15 Side leakproof sheet 16 Back sheet (Leakproof layer)
2 Wing part 4 Leak-proof pocket 5 Packaging material 6 Tab tape L1, L2 Folding curve across all of the leak-proof pocket, wing part and high rigidity area

Claims (5)

A vertically long absorbent main body having an absorbent layer and a leak-proof layer, a pair of side leak-proof sheets disposed on both side portions on the skin contact surface side of the absorbent main body, and laterally outward from the absorbent main body An absorbent article having a pair of wings extending in the direction,
Between each of the pair of side leakproof sheets and the absorbent layer, a leakproof pocket is formed that opens toward the center in the width direction of the absorbent main body,
The absorption layer includes a liquid-permeable surface sheet and an absorber,
The absorbent body has a two-layer wide absorbent sheet disposed over the entire region in the width direction, and a narrow absorbent sheet disposed only in the center in the width direction,
The absorbent main body has a high-rigidity region having a higher rigidity than the portions located on both sides of the absorbent body at the center in the width direction,
In the high rigidity region of the absorbent main body, each of the two layers of the wide absorbent sheet and the narrow absorbent sheet are bonded via an adhesive, and on both sides of the high rigidity region of the absorbent main body. In the part located, the two layers of the wide absorbent sheet are not joined,
Wrapped in a longitudinal direction along a folding line that crosses all of the leakage-proof pocket, the wing portion, and the high-rigidity region ,
The absorbent article is an absorbent article that is bent with the skin contact surface side inward in the folding line . The absorbent article according to claim 1, wherein each of the pair of side leakage preventing sheets has a density of 0.05 to 0.15 g / cm ³ .   2. The absorbent article according to claim 1, wherein the pair of side leak-proof sheets are partially increased in density by embossing at a portion where the folding line crosses. The absorbent layer comprises a liquid-permeable topsheet and the absorbent body, the absorbent body in the portion located on either side of the high rigidity region of the absorbent body contains 30 wt% or more bulking fibers,該嵩high fibers, absorbent article of any one of claims 1 to 3, a fiber having a crimp structure. The absorbent article of any one of claims 1-4 maximum thickness in a developed state removed from the package is 5mm or less.

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