JP4986519B2 - 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, absorbent articles, such as a sanitary napkin provided with a wing part, are widely known.
The wing portion of this type of absorbent article has an adhesive portion on one side, and when used, bends to the non-skin-facing surface side of the underwear along the side edge of the crotch portion of the underwear such as shorts. And is fixed to the non-skin facing surface of the underwear through the adhesive portion.

Such a wing part prevents a positional shift between the absorbent article and the undergarment during wearing, or prevents the undergarment from becoming dirty with body fluid such as menstrual blood.
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.

  Patent Document 1 describes a sanitary napkin that has ear pieces on both sides of a cover sheet that encloses an absorbent body, and is provided with a pressure-sensitive adhesive on the back surface of each ear piece. Further, Patent Document 2 describes a sanitary napkin in which fastening means are provided on each of the back surface of a pair of wings provided on both sides of one part in the longitudinal direction and the outer surface of the leak-proof layer on the other part in the longitudinal direction. ing. Furthermore, Patent Document 3 describes a sanitary napkin in which an adhesive portion is provided at a position near the front edge of the wing portion.

Japanese Utility Model Publication No. 60-158828 Japanese Utility Model Publication No. 4-103117 JP 2004-113591 A

However, the conventional absorbent article having a wing portion is difficult to fit into the curved shape of the crotch portion of the shorts or the wing is formed to be relatively small, so that the fixing property is low, and the wearer's movement during wearing For example, the wing part may be peeled off from the non-skin facing surface of the underwear, and the wing part may be turned over, which may impair the effect of preventing misalignment or may give the wearer an uncomfortable feeling.
Similarly, the wing portion of the sanitary napkin described in Patent Documents 1 and 3 is easily peeled off from the non-skin facing surface of the underwear due to the movement of the wearer during wearing.
The wings of the sanitary napkin described in Patent Document 2 are provided on both sides of the rear end of the napkin. It is to be worn and fixed to the inner surface (skin facing surface) of the shorts. That is, the wing in the sanitary napkin described in Patent Document 2 does not correspond to the wing portion in the present invention.

  Accordingly, an object of the present invention is to provide an absorbent article that is less likely to turn the wing part and has excellent antifouling properties for underwear.

  The present invention provides an absorbent main body having an absorbent layer and a leak-proof layer, and is provided on both sides in the longitudinal direction of the absorbent main body. In the absorbent article having a pair of wing parts fixed to the non-skin facing surface, each of the pair of wing parts has a fixed part center line that bisects the length of the fixed part in the longitudinal direction of the absorbent article The object is achieved by providing an absorbent article in which the area of the rear part is smaller than the area of the front part when divided into a front part and a rear part at the boundary.

  The absorbent article of the present invention is less likely to turn over the wing part and is excellent in antifouling properties for underwear.

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 includes 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 wing portions 2 and 2 provided on both sides in the longitudinal direction of the absorbent main body 11.

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 located between the top sheet 13 and the back sheet 16, and these are integrated. In addition, the main body adhesive part (illustration omitted) fastened by the non-skin opposing surface (surface which consists of the back surface sheet 16) of the absorptive main body 11 on the skin opposing surface (surface toward the skin side) of underwear etc. Is provided.

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 provided in the longitudinal direction both sides of the absorptive main body 11 in the excretion part opposing part A. As shown in FIG. 2, the pair of wing portions 2, 2 in the present embodiment is formed by fixing wing portion forming sheets 22 to both side edges in the longitudinal direction of the absorbent main body 11.
Both side portions 13a, 13a of the top sheet 13 are wound down to the back sheet 16 side of the absorbent body 14 so as to cover both longitudinal sides of the absorbent body 14, and the wing portion forming sheet 22 is unwound. In a state of being sandwiched between both side portions 13a, 13a of the top sheet 13 and the back sheet 16, they are fixed to these two sheets by a known joining method such as heat or ultrasonic seal or adhesive.

Adhesive is applied to one side of each of the pair of wing portions 2 and 2, and rectangular adhesive portions (fixed portions) 23 and 23 are formed in a plan view.
As shown in FIG. 3, each of the pair of wing parts 2 and 2 has an adhesive part center line CL (fixed part center line) CL that divides the length L of the adhesive part 23 provided in each into two in the napkin longitudinal direction. When the front part 2F and the rear part 2R are divided at the boundary, the area of the rear part 2R is made smaller than the area of the front part 2F.
As shown in FIG. 1, the napkin 1 according to the present embodiment is symmetrical with respect to the longitudinal center line L <b> 1 extending in the longitudinal direction of the absorbent main body 11 including the positions and shapes of the wing part 2 and the adhesive part 23. It has a shape. Therefore, in the following description, there is a case where it is described with reference to FIG. 3 showing only one wing portion, but the same applies to the other wing portion.

As a result of earnest research on turning of the wing part that occurs during wearing, the present inventors have found that the turning of the wing part easily proceeds from the rear side of the wing part, and further, the shape of the wing part is determined by the center line of the adhesive part. By making the shape of the rear part 2R smaller than the area of the front part 2F when divided into the rear part 2R and the front part 2F with the CL as a boundary, the wing part is effectively prevented from turning over. I found out that
In the napkin 1 of the present embodiment, the area of the rear part 2R of the wing part 2 is smaller than the area of the front part 2F, so that the wing part can be effectively prevented from being turned over, thereby preventing misalignment. In addition, since it is difficult for the wing portion to be turned over, the underwear antifouling property by the wing portion is also excellent.

  The ratio of the area of the rear part 2R to the area of the front part 2F (percentage) from the viewpoint of preventing the wing part from turning over and covering the side edges of the underwear crotch part over a sufficient length to obtain excellent underwear antifouling properties Is preferably 50 to 95%, more preferably 60 to 75%.

The wing portion 2 of the napkin 1 includes a pair of front and rear edge portions 25 and 26 that face each other in the longitudinal direction of the napkin, and an edge portion 27 at the tip of the wing portion that faces each other in the width direction of the napkin (same as the extending direction of the wing portion). And a wing portion proximal end 28.
As shown in FIG. 3, the edge 26 on the rear side in the longitudinal direction of the napkin is located in front of an imaginary straight line L2 passing through the rear end 27r of the edge 27 at the front end of the wing part and the rear end 28r of the wing base end 28. Is so curved. The edge 26 and the virtual straight line L2 do not intersect.
Since the edge 26 on the rear side of the wing part 2 is curved in this way, the wing part is prevented from being turned over, the antifouling property is improved by adapting to the curved shape of the underwear, and the wing part is folded back. Is even better.

  Further, the straight line distance L3 (see FIG. 3) from the virtual straight line L2 to the edge 26 gradually increases and then gradually decreases from the base end 28 toward the edge 27 of the tip, and the edge of the tip ends. It is the maximum at a substantially middle point between 27 and the base end 28. The maximum value of the distance L3 is preferably 5 to 50%, particularly 5 to 25% of the length of the line segment connecting 27r and 28r.

In the wing portion 2 of the napkin 1, the inclination angle θ1 (see FIG. 3) of the edge 26 on the rear side in the longitudinal direction of the napkin with respect to the longitudinal direction of the absorbent main body 11 is the absorptivity of the edge 25 on the front side in the longitudinal direction of the napkin. The tilt angle θ2 (see FIG. 3) with respect to the longitudinal direction of the main body 11 is substantially the same. The inclination angle with respect to the longitudinal direction of the absorbent main body is an inclination angle with respect to the longitudinal center line L1 of the absorbent main body 11 or a straight line L1 ′ parallel thereto.
Even when the inclination angle θ1 of the rear edge 26 is substantially the same as or smaller than the inclination angle θ2 of the front edge 25, the rear edge 26 is set as described above. In addition, by curving so as to be positioned forward of the imaginary straight line L2, the area of the rear part 2R is made larger than the area of the front part 2F while ensuring the excellent underwear antifouling property by increasing the length of the base end 28. It can be easily reduced.

  When the tilt angle θ1 is substantially equal to or less than the tilt angle θ2, the tilt angle θ1 is preferably 30 to 75 degrees, particularly 45 to 65 degrees, and the tilt angle θ2 is 50 to 80 degrees, particularly 60. -80 degrees is preferable. When the inclination angle θ1 and the inclination angle θ2 are substantially the same, the case where the absolute value of the difference between the two is 5 degrees or less is included.

  In the napkin 1 of this embodiment, the edge 25 on the front side of the wing portion 2 in the longitudinal direction of the napkin is a straight line as shown in FIG. 3, and the front end 27f of the edge 27 at the tip of the wing portion and the wing portion. It overlaps with a virtual straight line L4 (see FIG. 5) passing through the front end 28f of the base end 28. Instead of this, the front edge 25 can be curved so as to be located behind the virtual straight line L4, similarly to the front edge 25 of the wing portion 2 of the embodiment shown in FIG.

  Further, in the wing portion 2 of the napkin 1, the length L7 of the edge portion 27 at the distal end is shorter than the length L8 of the proximal end 28. When the length L7 of the edge portion 27 at the front end is shorter than the length L8 of the base end 28, it is possible to add a wing turn-up preventing property while keeping the underwear antifouling property. The length L7 of the edge 27 is preferably 30 to 80%, particularly 40 to 60% of the length L8 of the base end 28.

  4-7 is a figure (FIG. 3 equivalent view) which shows the wing part of the sanitary napkin which is other embodiment of this invention. About other embodiment shown in FIGS. 4-7, a different point from the napkin 1 mentioned above is demonstrated, about the same point, the same code | symbol is attached | subjected and description is abbreviate | omitted.

The wing portion 2 shown in FIGS. 4 and 5 is configured such that the inclination angle θ1 of the edge 26 on the rear side in the napkin longitudinal direction with respect to the longitudinal direction of the absorbent main body 11 is the absorbent main body in the edge 25 on the front side in the napkin longitudinal direction. 11 is greater than the inclination angle θ2 with respect to the longitudinal direction.
In the wing portion 2 shown in FIG. 4, the front edge 25 and the rear edge 26 are both linear. On the other hand, in the wing portion 2 shown in FIG. 5, the rear edge 26 is an imaginary straight line L <b> 2 that passes through the rear end 27 r of the edge 27 at the front end of the wing portion and the rear end 28 r of the wing base end 28. It is curved so as to be positioned further forward, and the front edge 25 is positioned behind a virtual straight line L4 passing through the front end 27f of the edge 27 at the tip of the wing and the front end 28f of the wing base 28. Is curved.

  When the front and / or rear edges 25 and 26 of the wing 2 are non-linear as in the wing 2 shown in FIG. 5, the longitudinal direction of the absorbent main body 11 at the non-linear edge Is the angle of the imaginary straight lines L2 and L4 with respect to the longitudinal center line L1 of the absorbent main body 11 or the straight line L1 ′ parallel thereto.

Like the wing portion shown in FIGS. 4 and 5, the inclination angle θ1 of the rear edge portion 26 is made larger than the inclination angle θ2 of the front edge portion 25 so that the area of the rear portion 2R of the wing portion 2 is increased. By making it smaller than the area of the front part 2F of 2, it is possible to effectively prevent the wing from being turned up, it is excellent in displacement prevention, and further, the wing is not easily turned up. It also has excellent dirtiness.
When the inclination angle θ1 of the rear edge 26 is larger than the inclination angle θ2 of the front edge 25, the inclination angle θ1 is preferably 50 to 90 degrees, particularly 60 to 90 degrees, and the inclination angle θ2 is 45 to 80 degrees, particularly 45 to 70 degrees are preferable, and the difference in inclination angle (θ1−θ2) is preferably 10 to 30 degrees, particularly preferably 15 to 25 degrees.

A base end 28 of the wing portion 2 in the napkin 1 is a boundary portion between the absorbent main body 11 and the wing portion 2. When the side edge 11a of the absorbent main body located in front of the wing part 2 and the front edge 25 of the wing part 2 are continuous with a curved line without a corner, like the napkin shown in FIG. Or when the side edge part 11b of the absorbent main body located behind the wing part 2 and the edge part 26 on the rear side of the wing part 2 are continuous with a curve without interposing a corner, as shown in FIG. The point on the peripheral edge where the angle θ3 of the peripheral edge of the napkin with respect to the longitudinal center line L1 of the absorbent main body 11 or the straight line L1 ′ parallel thereto is 30 degrees is the front end of the base portion 28 of the wing part 2 28f or rear end 28r.
In addition, as in the case of the napkin shown in FIG. 6, when the front edge 25 of the wing 2 and the edge 27 at the tip of the wing are continuous with a curve without passing through the corner, or after the wing 2 When the edge 26 on the side and the edge 27 at the tip of the wing are continuous with a curved line without passing through the corner, as shown in FIG. 6, the longitudinal center line L1 of the absorbent main body 11 is parallel or parallel thereto. A point on the peripheral edge where the angle θ4 of the tangential line of the napkin with respect to the straight line L1 ′ is 45 degrees is defined as a front end 27f or a rear end 27r of the edge 27 at the front end of the wing portion 2.

  In the wing part 2 shown in FIG. 7, the edge part 27 at the tip of the wing part 2 is inclined with respect to the longitudinal direction of the absorbent main body 11. The inclination direction of the edge portion 27 at the front end of the wing portion may be such that the front end 27f is positioned closer to the longitudinal center line L1 of the absorbent main body 11 than the rear end 27r of the edge portion 27. As shown in FIG. 7, it is preferable that the rear end 27r of the edge portion 27 is inclined in a direction located near the longitudinal center line L1 of the absorbent main body 11 rather than the front end 27f. When inclined in the latter direction (the direction shown in FIG. 7), the inclination angle θ5 of the edge portion 27 with respect to the longitudinal center line L1 of the convergent main body 11 or the straight line L1 ′ parallel thereto is 10 to 45, In particular, it is preferably 15 to 30.

As a material for forming each part of the napkin 1 described above, various materials conventionally used for this type of absorbent article can be used without particular limitation. For example, as the surface sheet 13, a hydrophilic nonwoven fabric or an apertured film can be used. As the back sheet 16, a liquid-impermeable resin film, a laminate of a resin film and a nonwoven fabric, a woven fabric, or the like can be used. As the absorbent body 14, a fluff pulp pile or a mixed pile of fluff pulp and superabsorbent polymer particles coated with a water-permeable material such as tissue paper can be used. The adhesive part 23 is formed by applying various hot-melt adhesives such as styrene-butadiene and styrene-isoprene to the sheet material forming the wing part, or attaching various adhesive tapes. be able to. Moreover, as a fixing | fixed part of this invention, the male material etc. of mechanical surface fasteners (Magic tape (trademark) etc.) other than an adhesion part can also be used.
In addition, as the wing portion forming sheet 22, a stretchable sheet can be used, but a substantially non-stretchable sheet can also be used. As the wing portion forming sheet 22, a nonwoven fabric by various manufacturing methods, a laminate of a nonwoven fabric and a resin film, a laminate of a nonwoven fabric and paper, a fabric, or the like can be used. In the present invention, it is not necessary to form an expansion / contraction portion or the like formed by bending the sheet in a bellows shape in the wing portion.

As mentioned above, although several embodiment of this invention was described, this invention is not restrict | limited to said embodiment, A various change is possible.
For example, like the sanitary napkin shown in FIG. 8, a pair of side leakage prevention sheets in which the skin facing surface of the absorbent main body 11 is continuously arranged so as to partially overlap the liquid permeable surface sheet 13 and both sides thereof. 15, and the wing part 2 can also be composed of a side leak-proof sheet 15 and a back sheet 16 that extend outward from both side edges of the absorber 14. Further, one or two of the top sheet 13, the back sheet 16, and the side leak-proof sheet 15 are extended outward from both side edges of the absorber 14, and are extended to one sheet or two sheets. The wing part 2 can also be formed with the laminated body of the above sheet | seat.

Moreover, although the adhesion part 23 in the napkin 1 mentioned above was a rectangular shape by planar view, the planar view shape of fixing | fixed parts, such as an adhesion part, may be square, and from the fixed property of a wing part. The shape similar to the external shape of the wing at the end in the width direction is good. For example, in the wing part having the shape shown in FIGS. 3 to 6, the width direction side of the fixed part is parallel to the tip of the wing like a rectangle or a trapezoid. It is preferable that the shape of the portion is formed. In the wing portion having the shape shown in FIG. 7, a shape that matches the protrusion at the tip of the wing such as a triangle or a pentagon is preferable.
The length in the longitudinal direction of the fixed portion is the length between the frontmost portion and the rearmost portion with respect to the longitudinal center line, and the length is divided into two in the longitudinal direction of the absorbent article. It is divided into a front part and a rear part on the boundary of the adhesive part center line.
In addition, unintentional coating unevenness (parts where the adhesive is present beyond the coating range) that occurs when the adhesive is applied should be removed from the adhesive part (fixed part) due to its low adhesive strength to underwear. Is preferred.
Moreover, in each embodiment mentioned above, it can replace with the adhesion part and can provide the mechanical engaging part which consists of a male material etc. of a mechanical hook-and-loop fastener as a fixing | fixed part.

In addition to the sanitary napkin, the absorbent article of the present invention may be a panty liner (origami sheet), an incontinence pad, or the like.
In addition, the description omitted in one embodiment and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately applied between the embodiments. Can be substituted for each other.

FIG. 1 is a plan view showing a sanitary napkin according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a cross section taken along line II-II in FIG. FIG. 3 is an enlarged plan view showing a wing portion of the sanitary napkin shown in FIG. 1. FIG. 4 is a view (corresponding to FIG. 3) showing a wing portion of a sanitary napkin according to another embodiment of the present invention. FIG. 5 is a view (corresponding to FIG. 3) showing a wing portion of a sanitary napkin according to still another embodiment of the present invention. FIG. 6 is a view (corresponding to FIG. 3) showing a wing portion of a sanitary napkin which is still another embodiment of the present invention. FIG. 7 is a view (corresponding to FIG. 3) showing a wing portion of a sanitary napkin which is still another embodiment of the present invention. FIG. 8 is a view (corresponding to FIG. 2) showing a cross section along the width direction of a sanitary napkin which is still another embodiment of the present invention.

Explanation of symbols

1 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 11 Absorbent main body 12 Absorbent layer 13 Top sheet 14 Absorber 15 Side leakproof sheet 16 Back sheet (leakproof layer)
2 Wing part 2F Front part 2R Rear part 23 Adhesive part (fixed part)
CL adhesive center line (fixed part center line)
25 Edge of absorbent article longitudinal direction front side of wing part 26 Edge of absorbent article longitudinal direction rear side of wing part 27 Edge edge of leading edge of wing part 27r Rear end of edge of leading edge 28r Base end of wing part 28r Rear end of base end

Claims (5)

An absorbent main body having an absorbent layer and a leak-proof layer, and provided on both sides of the absorbent main body in the longitudinal direction, and in use, is bent to the non-skin facing surface side of the underwear and the non-skin facing of the underwear through a fixing portion In an absorbent article having a pair of wing parts fixed to the surface,
The absorbent article is a sanitary napkin,
Each of the pair of wing portions has a pair of front and rear edge portions opposed to each other in the longitudinal direction of the absorbent article, an edge portion of the wing portion distal end opposed to each other in the width direction of the absorbent article, and a proximal end of the wing portion. ,
Each of the pair of wing portions includes a front end of the edge of the distal end positioned behind the front end of the proximal end, and a rear end of the edge of the distal end positioned forward of the rear end of the proximal end. The length of the edge of the base is shorter than the length of the proximal end,
Each of the pair of wing parts is divided into a front part and a rear part with a fixed part center line that bisects the length of the fixed part in the longitudinal direction of the absorbent article as a boundary. Absorbent article smaller than the area of.   The edge of each of the pair of wing parts on the rear side in the longitudinal direction of the absorbent article is curved so as to be positioned forward of an imaginary straight line passing through the rear end of the edge of the wing part tip and the rear end of the wing part base end. The absorbent article according to claim 1. Each of the pair of wing portions has an inclination angle of the edge on the rear side in the longitudinal direction of the absorbent article with respect to the longitudinal direction of the absorbent body, and the edge on the front side in the longitudinal direction of the absorbent article with respect to the longitudinal direction of the absorbent body. The absorptive article according to claim 1 or 2 larger than an inclination angle. With respect to the longitudinal direction of the absorbent main body, the edge of the tip of each of the pair of wing portions is oriented so that the rear end is closer to the longitudinal center line of the absorbent main body than the front end of the edge . the absorbent article according to any one of claim 1 to 3, which inclined. The absorbent article according to any one of claims 1 to 4, wherein the fixing portion is an adhesive portion, and the shape in plan view is a rectangular shape, a square shape, or a trapezoidal shape .

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