JP2008188181A - Absorbent articles - Google Patents

Abstract

To provide a sanitary napkin capable of preventing a strong crease from being formed on a fold for individual packaging formed on a rear wing while providing a high rigidity portion with high bending strength on the rear wing.
A sanitary napkin (1) includes a vertically long main body (1a) and a rear wing (7) that protrudes from the rear in the longitudinal direction of the main body (1a) to both sides in the width direction and is disposed on the back side of the wearer when worn. . The sanitary napkin 1 is folded one or more times in the longitudinal direction and individually wrapped, whereby a fold L1 extending in the width direction is formed in the rear wing 7. A high-rigidity portion 73 having high bending strength is provided in the rear wing 7, and the high-rigidity portion 73 is provided so as not to overlap the crease L <b> 1 formed in the rear wing 7.
[Selection] Figure 1

Description

  The present invention relates to an absorbent article having a rear wing, and more particularly to a sanitary napkin having a rear wing.

  As a conventional sanitary napkin, a liquid-permeable surface sheet provided on the skin-side surface, a liquid-impermeable back sheet provided on the clothing-side surface, and a surface sheet and a back sheet are interposed. An absorbent body, a front wing that protrudes in the width direction from the front portion in the longitudinal direction of the main body portion and is disposed on the wearer's stomach when worn, and a width from the rear portion in the longitudinal direction of the main body portion. A sanitary napkin is known that includes a rear wing that protrudes on both sides in the direction and is disposed on the back side of the wearer when worn (see, for example, Patent Documents 1 and 2).

In the sanitary napkin of Patent Document 1, a reinforcing sheet is joined over the front wing and the rear wing, and the rigidity of the front wing and the rear wing is increased. In addition, the sanitary napkin of Patent Document 2 has the rigidity of the rear wing increased by embossing the rear wing.
Japanese Utility Model Publication No. 7-33314 Japanese Patent Application Laid-Open No. 2003-339656

  In general, sanitary napkins need to be folded a plurality of times (for example, three times) in the longitudinal direction in order to wrap them in a compact manner. For this reason, folds are formed when they are opened during use.

  However, when a crease is formed in the rear wing with increased rigidity as in the prior art, strong creases tend to occur, and if such creases are strongly attached, it becomes difficult to adapt to clothing such as shorts. End up.

  The present invention has been made to solve the above-mentioned problems, and its object is to provide a strong crease in the fold for individual packaging formed in the rear wing while providing a high rigidity portion with high bending strength in the rear wing. An object of the present invention is to provide an absorbent article such as a sanitary napkin that can prevent this.

  As a result of repeated research, the inventor of the present application has found that there is a correlation between the bending strength of the sheet and the easiness of folding, and based on this, the rear wing is provided with a high rigidity portion. The present inventors have come up with an absorbent article that can prevent strong creases from being formed in the folds for individual packaging that are formed.

  The present invention is a liquid-permeable surface sheet provided on the skin-side surface, a liquid-impermeable back sheet provided on the clothing-side surface, an absorber interposed between the surface sheet and the back sheet, A longitudinally long main body portion and a rear wing that protrudes from the longitudinal rear portion of the main body portion to both sides in the width direction and is disposed on the back side of the wearer when worn, and is folded at least once in the longitudinal direction. It is an absorbent article in which a fold extending in the width direction is formed in the rear wing by being individually packaged, and bending strength is included in the rear wing so as not to include a fold formed in the rear wing. A high-rigidity portion is provided.

  According to the present invention, by providing a highly rigid portion at a predetermined position of the rear wing of the absorbent article, the handling of the rear wing is improved. For example, when the region where the rear wing is easy to twist is set as a highly rigid portion, the rear wing becomes difficult to twist. In addition, according to the present invention, the crease forming part where the fold of the rear wing is formed is set to have a lower bending strength than the high rigidity part of the rear wing, so that the crease forming part is creased more than the high rigidity part. The rear wing becomes easier to adjust to clothes such as shorts.

  Hereinafter, an absorbent article according to an embodiment of the present invention will be described with reference to the drawings.

  The absorbent article of the following embodiment is an example in which the present invention is applied to a sanitary napkin used by a woman wearing it on the inner surface of an undergarment.

“First Embodiment”
[Basic configuration of sanitary napkin]
FIG. 1 is a top view showing the entire structure of the sanitary napkin 1 of the present embodiment. As shown in FIG. 1, a sanitary napkin 1 according to the present embodiment includes a vertically long main body 1a and a front wing 6 that is formed to protrude from the crotch B approximately in the longitudinal direction of the main body 1a to both sides in the width direction. And a rear wing 7 projecting from the longitudinal rear portion C of the main body 1a on both sides in the width direction. As described above, the sanitary napkin 1 is formed in a vertically long shape as a whole, and sequentially from the one end to the other end in the longitudinal direction, the front part A disposed near the wearer's ventral side when worn, and the liquid of the wearer The crotch part B disposed opposite to the discharge part and the rear part C disposed opposite the wearer's back, that is, the wearer's buttocks, can be seen.

  2 is a cross-sectional view of the sanitary napkin 1 of the present embodiment, FIG. 2a is a cross-sectional view taken along line IIa-IIa in FIG. 1, and FIG. 2b is a cross-sectional view taken along line IIb-IIb in FIG. It is. As shown in FIG. 2, the main body 1a includes a liquid permeable top sheet 2 provided on the skin side surface, a liquid impermeable back sheet 3 provided on the clothing side surface (non-skin side surface), and a surface. Between the sheet | seat 2 and the back surface sheet 3, it comprises and comprised the absorptive core 4 as a liquid holding | maintenance absorber.

  As for the surface sheet 2, the width direction both ends 2c and 2c are joined to the back sheet 3 side (the nonwoven fabric 5 mentioned later in this example) so that the absorptive core 4 may be wrapped.

  The back sheet 3 has an extending portion 3b extending outward in the width direction from the absorbent core 4, and a nonwoven fabric 5 is laminated on the skin contact surface side of the extending portion 3b to form an adhesive. It is joined (for example, hot melt bonding), and this portion becomes the front wing 6 and the rear wing 7 (see FIG. 1).

  In the front wing 6 and the rear wing 7, a reinforcing sheet 8 is partially interposed between the extending portion 3b of the back sheet 3 and the nonwoven fabric 5 (see FIG. 2a). The portions where the reinforcing sheet 8 is interposed become high-rigidity portions 63 and 73 with high bending strength, and the portions where the reinforcing sheet 8 is not interposed become low-rigidity portions 61 and 71 with lower bending strength than the high-rigidity portions 63 and 73. .

  Adhesive portions 10 and 11 for fixing the wings 6 and 7 to the clothing are provided on the clothing-side surfaces of the high-rigidity portion 63 of the front wing 6 and the high-rigidity portion 73 of the rear wing 7 ( See FIG. 2a). Thereby, the wings 6 and 7 can be adhesively fixed on the inner surface of clothing such as shorts when worn by the adhesive portions 10 and 11.

  Moreover, as shown in FIG. 1, the pressing part 9 is formed in the surface of the surface sheet 2 so that the center part of the main-body part 1a may be enclosed. In addition, FIG. 2 is a schematic cross-sectional structure, and the part corresponding to the said pressing part is not illustrated. In this pressing part 9, the surface sheet 2 and the absorptive core 4 are heat-pressed to the back sheet 3 side, the absorptive core 4 is crushed, and the surface of the surface sheet 2 is concave. Since the density of the absorptive core 4 is high, this pressing part 9 has high absorptive power. Therefore, when menstrual blood sucked into the central portion of the main body 1a spreads outward in the width direction, it can be run in the longitudinal direction of the napkin 1 along the squeezed portion 9, thereby making the whole napkin 1 more efficient. It is designed to absorb menstrual blood and suppress menstrual leakage.

[Material of each component]
The material of the surface sheet 2, the back sheet 3, the absorptive core 4, the reinforcement sheet 8, and the nonwoven fabric 5 is supplemented below.

  For the surface sheet 2, for example, a porous or non-porous nonwoven fabric or a porous plastic sheet is used.

  For the back sheet 3, a polyethylene film in which a colorant is blended with a polyethylene resin is used. As the back sheet 3, for example, a hydrophobic nonwoven fabric, a liquid-impervious plastic film, a laminate sheet of a nonwoven fabric and a water-impermeable plastic film, and the like can be used. Further, an SMS nonwoven fabric in which a melt-blown nonwoven fabric having high water resistance is sandwiched between high-strength spunbond nonwoven fabrics can also be suitably used.

  The absorptive core 4 consists of fluffy pulp or an airlaid nonwoven fabric and a superabsorbent polymer, for example. Examples of fluffy pulp include artificial cellulose fibers such as chemical pulp, cellulose fibers, rayon and acetate. Moreover, as an airlaid nonwoven fabric, the nonwoven fabric which heat-fused the pulp and the synthetic fiber or fixed with the binder is mentioned. Examples of the superabsorbent polymer include starch-based, acrylic acid-based, and amino acid-based particulate or fibrous polymers.

  For the nonwoven fabric 5, a spunbond nonwoven fabric of polyethylene / polypropylene composite fiber is used. As the nonwoven fabric, other materials such as spun lace, spun bond, thermal bond, melt blown, needle punch, air through and the like are used. As the material fibers constituting the nonwoven fabric, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  The reinforcing sheet 8 is made of polyethylene oxide (0.1% or less) added as a papermaking additive. In addition, the reinforcing sheet 8 can be formed of paper, non-woven fabric, synthetic resin film, synthetic resin foam sheet, or the like.

In addition, the density of the nonwoven fabric 5 is preferably 0.03 g / cm ³ or more, and more preferably 0.05 g / cm ^{3 to} 0.15 g / cm ³ . Density decreases less water resistance than 0.05 g / cm ³ (sheet strength), because the entire rear wing 7 increases the rigidity higher than 0.15 g / cm ³ becomes hard.

The density of the reinforcing sheet 8, when the density of the non-woven fabric 5 is in the range of ^{0.03g / cm 3 ~0.15g / cm 3} , is preferably 0.05 g / cm ³ or more, 0.15 g / More preferably, it is cm ^{3 to} 0.2 g / cm ³ . In consideration of the density of the non-woven fabric 5, if the density of the reinforcing sheet 8 is lower than 0.1 g / cm ³ , the sheet strength of the high-rigidity portion 73 described later decreases, and if higher than 0.2 g / cm ³ , the high-rigidity portion 73 This is because it becomes too hard and the comfort of wearing becomes worse.

〔Individual package〕
The sanitary napkin 1 of the present embodiment is folded three times as shown in FIG. 3 with the packaging sheet 15 laminated on the back sheet 3 side and the wing release sheet 13 laminated on the top sheet 2 side. It is designed to be packaged.

  More specifically, individual packaging is performed according to the following procedure.

  First, the packaging sheet 15 is bonded to the back sheet side of the sanitary napkin 1 in a peelable state, and along the boundary line 21 between the body portion 1a of the sanitary napkin 1 and the wings 6 and 7, as shown in FIG. Then, the wings 6 and 7 are folded to the main body 1a side, and the wing release sheet 13 is bonded to the peelable state so as to cover the adhesive portions 10 and 11 on the back side of the wings 6 and 7.

  Next, as shown in FIG. 3d → FIG. 3c, the sanitary napkin 1 is bent in the longitudinal direction at a position L1 slightly rearward in the longitudinal direction from the central position where the rear wing 7 is equally divided in the longitudinal direction. Then, a fold L1 is formed in the rear wing 7 of the sanitary napkin 1 along the position L1 extending in the width direction.

  Next, as shown in FIG. 3 c → FIG. 3 b, it is bent in the longitudinal direction at a position L 2 near the boundary between the crotch part B and the rear part C. Then, the crease L2 is made along the position L2 extending in the width direction.

  Further, as shown in FIGS. 3b to 3a, the sanitary napkin 1 is bent in the longitudinal direction at a position L3 in the vicinity of the boundary portion between the front portion A and the crotch portion B. Thereby, the fold L3 is made along the position L3 extending in the width direction. Finally, as shown in FIG. 3a, both side portions 15a in the width direction are joined and sealed, and the folded state is maintained by the adhesive tape 17 to complete individual packaging.

[Position of high rigidity part]
As described above, the sanitary napkin 1 of the present embodiment has a structure in which the fold L1 is formed in the rear wing 7. However, in the present embodiment, from the viewpoint of making the fold L1 difficult to crease, the rear wing is concerned. The high-rigidity portion 73 is provided so as not to reach the crease L <b> 1 formed in the inner wall 7. In the present embodiment, the highly rigid portion 73 is provided in the region C1 on the front side in the longitudinal direction from the fold line L1, and is not provided in the region C2 on the rear side in the longitudinal direction from the fold line L1.

〔effect〕
(1) A sanitary napkin 1 of the present embodiment has a vertically long main body 1a and a rear wing 7 that protrudes from the longitudinal rear portion of the main body 1a to both sides in the width direction and is arranged on the wearer's back when worn. And a sanitary napkin 1 in which a fold line L1 extending in the width direction is formed in the rear wing 7 by being folded and wrapped in the longitudinal direction at least once, and formed in the rear wing 7 A high-rigidity portion 73 having high bending strength is provided in the rear wing 7 so as not to include the crease L1.

  That is, in the present embodiment, the high-rigidity portion 73 is provided at a predetermined position of the rear wing 7 of the sanitary napkin 1 so that the rear wing 7 can be handled easily. For example, by making the region where the rear wing 7 is easy to twist into the high-rigidity portion 73, the rear wing 7 becomes difficult to twist. Further, for example, by providing the high-rigidity portion 73 in the region where the adhesive portion 11 of the rear wing 7 is formed, the region where the adhesive portion 11 is provided is soft when the sanitary napkin 1 is opened and fixed to clothes such as shorts. By passing, it can prevent that the adhesion part 11 adheres to another site | part, and takes time to peel it off.

  Moreover, according to the present embodiment, the crease forming portion of the rear wing 7 is set to have a lower bending strength than the high-rigidity portion 73 of the rear wing 7. The rear wing 7 is easily adapted to clothes such as shorts.

  (2) Moreover, in the sanitary napkin 1 of this embodiment, the highly rigid part 73 is provided in the area | region C1 of the longitudinal direction front side at least from the said crease | fold L1. Therefore, since the high-rigidity portion 73 is provided in the region C1 in the vicinity of the crotch B, which is easily compressed from the width direction at the time of mounting, the rear wing 7 is particularly difficult to twist in the region C1 in the vicinity of the crotch B, Good wearability can be obtained.

  (3) In the sanitary napkin 1 of the present embodiment, the high-rigidity portion 73 is not provided in the region C2 on the rear side in the longitudinal direction of the fold line L1, but is provided only in the region C1 on the front side in the longitudinal direction.

  Therefore, the rear wing 7 has a higher bending strength in the region C1 on the front side in the longitudinal direction than the fold line L1, and a bending strength in the region C2 on the rear side in the longitudinal direction from the fold line L1. Thereby, in the area | region C1 which is easy to receive compressive force from the width direction both sides by being located in the vicinity of the crotch part B, it becomes difficult to bend with respect to the compressive force from the width direction both sides. Further, in the region C2 where there is almost no compressive force from both sides in the width direction, it becomes easy to become familiar with clothes such as shorts, and the wearability is further improved.

  (4) Further, in the sanitary napkin 1 according to the present embodiment, the high-rigidity portion 73 of the rear wing 7 is provided with the adhesive portion 11 for adhesively fixing the clothing side surface of the rear wing 7 to the clothing. . Therefore, when the sanitary napkin 1 is opened and fixed to clothes such as shorts, the area where the adhesive part 11 is provided is too soft, so that the adhesive part 11 is stuck to other parts and takes time and effort. Can be prevented.

  (5) In the sanitary napkin 1 of the present embodiment, the high-rigidity portion 73 of the rear wing 7 is formed by increasing the number of stacked sheets as compared with other portions of the rear wing 7. . Therefore, since a highly rigid part can be formed with a simple structure, manufacturing costs can be suppressed.

  In the present invention, in order to set the high rigidity part of the rear wing, in the rear wing formed by bonding a plurality of sheets with an adhesive, the high rigidity part of the rear wing is compared with other parts. A high rigidity part may be formed by increasing the amount per unit area of the adhesive, or a high rigidity part may be formed by embossing. Also in these manufacturing methods, since a highly rigid part can be manufactured with a comparatively simple structure, there exists an effect which can suppress manufacturing cost.

  From the viewpoint of obtaining the above effects more reliably, it is preferable that the material, position, characteristics, and the like are set in the following ranges.

Position of the high-rigidity portion of the rear wing 7 The high-rigidity portion of the rear wing 7 is preferably spaced apart from the fold L1 (d> 0), more preferably from the fold L1 toward the longitudinal direction of the napkin. D = 5 mm to 10 mm is preferable. This is because if it is 5 mm or more, the possibility of a high-rigidity portion being applied to the crease L1 due to a shake during production can be reliably avoided, and if it is 10 mm or more, the high-rigidity portion is reduced and twisting may occur easily. is there.

Bending strength of the high rigidity portion of the rear wing 7 The bending strength of the high rigidity portion of the rear wing 7 is preferably 60 mm or more and 120 mm or less as measured by the cantilever method. This is because if it is less than 60 mm, the rigidity with respect to the compressive force from both sides in the width direction is not sufficient, which causes a twist. Further, if it is larger than 120 mm, the rigidity becomes too high, and an uncomfortable feeling during use occurs. In particular, when the thickness is 80 mm or more, sufficient rigidity against compressive force from both sides in the width direction can be secured.

Bending strength of the crease forming part The bending strength of the crease forming part is preferably 60 mm or less as measured by the cantilever method in a state before the crease L1 is applied. This is because if it is larger than 60 mm, creases are likely to occur. Here, there is an advantage that adaptability to clothing such as shorts is increased as the bending strength is reduced.

〔Experimental result〕
The inventor conducted the following experiment in order to identify the correlation between the physical characteristics and the difficulty of folding the sheet.

〔sample〕
First, samples A, B, C, D, E, F, and G were prepared. Samples A, B, C, D, E, F, and G are obtained by bonding a plurality of materials with an adhesive.

[Sample A]
Sample A is obtained by bonding a spun pond non-woven fabric, a polyethylene film and a reinforcing paper with an adhesive. The spun pond non-woven fabric is a spun-bond non-woven fabric made of polyethylene / polypropylene composite fiber and has a basis weight of 22 g / m ² . The polyethylene film is a film obtained by blending a polyethylene resin with a colorant and has a basis weight of 22 g / m ² . The reinforcing paper is a paper added with polyethylene oxide (0.1% or less) as a papermaking additive, and has a basis weight of 30 g / m ² . The adhesive weight of the sample A is 10 g / m ² in total.

[Sample B]
Sample B uses the same sheet as Sample A, and only the basis weight of the adhesive is different. The basis weight of the adhesive of sample B is 6 g / m ² in total.

[Sample C]
Sample C is obtained by bonding a spun pond non-woven fabric, a polyethylene film, and waterproof paper with an adhesive. Sample C's spun pond nonwoven and polyethylene film are identical to Sample A. The waterproof paper is obtained by adding a petroleum resin / maleic anhydride copolymer (styrene / methacrylic acid ester copolymer) as a waterproofing agent to chemical fiber, and has a basis weight of 30 g / m ² . The basis weight of the adhesive of sample C is 10 g / m ² in total.

[Sample D]
Sample D uses the same material as Sample C, and differs only in the basis weight of the adhesive. The basis weight of the adhesive of sample B is 6 g / m ² in total.

[Sample E]
Sample E is obtained by bonding a spun pond non-woven fabric and a polyethylene film with an adhesive. The spun pond nonwoven fabric and polyethylene film of Sample E are the same as Samples A to D, and the basis weight of the adhesive is 5 g / m ² .

[Sample F]
Sample F is obtained by bonding an air-through nonwoven fabric and an embossed polyethylene film with an adhesive. The basis weight of the air-through nonwoven fabric is 25 g / m ² , the basis weight of the polyethylene film is 30 g / m ² , and the basis weight of the adhesive is 3 g / m ² .

[Sample G]
Sample G is obtained by laminating a polyethylene apertured film and a polyethylene film with an adhesive. The basis weight of the polyethylene apertured film is 28 g / m ² , the basis weight of the polyethylene film is 25 g / m ² , and the basis weight of the adhesive is 3 g / m ² .

[Evaluation of creases]
Each sample A to G was bent and creased, and then the ease of crease was determined by touch and visual observation. As shown in FIG. 12, samples A, B, C, and D were easy to fold, and samples E, F, and G were difficult to fold.

[Evaluation of bending strength]
The measuring method of the bending strength by the cantilever method was performed as follows according to JIS-L1018. The measurement object was cut into a size of 150 mm in the MD direction and 25 mm in the CD direction, and this was used as a measurement sample. Then, with a cantilever manufactured by Daiei Science Seiki Seisakusho, the measurement sample is sandwiched under the holding plate of the cantilever and slid in the slope direction to automatically measure the moving distance at a speed of 5 mm / sec. The measurement is performed both when the surface of the measurement sample is down and when the back surface of the measurement sample is down, and the measurement results are the distance traveled when the surface is down and the distance traveled when the back is down. Take the average of

  As a result of measuring the bending strength of samples A, C, and E by the cantilever method, the bending strength of sample A is 86.8 mm, the bending strength of sample C is 64.4 mm, as shown in FIG. The bending strength was 53.0 mm. Bending strength was higher for samples that were easier to fold, and bending strength was lower for samples that were less likely to fold. Since the samples that are easily creased are Samples A and C, and the sample that is not easily creased is Sample E, the bending strength at the crease formation site is preferably 60 mm or less by the cantilever method. By doing so, it becomes difficult to fold the crease forming part.

[Evaluation of compression work]
The compression work was measured as follows. Cut from the product in the MD direction (same direction as the product flow direction) to 40 mm and in the CD direction to 15 mm, bend it in the MD direction, fix the ends in the MD direction with tape, and make a cylinder with a height of 15 mm This is taken as a measurement sample. An autograph AGS-1kNG manufactured by Shimadzu Corporation is used, a circular jig having a cross section of 3 cm ² is attached to the upper chuck of the autograph, and the bottom is a flat plate. The initial height is set to 13 mm, and the measurement sample is compressed in the axial length direction at a speed of 10 mm / min and compressed to 12 mm. And the work (mN * mm) at the time of compressing from 0 mm to 12 mm is measured, and let a measurement result be compression work WC (mN * mm).

  As a result of measuring the compression work of each sample, as shown in FIG. 12, the compression work of sample A is 799.9 mN · mm, the compression work of sample B is 727.5 mN · mm, The compression work of C is 415.8 mN · mm, the compression work of sample D is 307.9 mN · mm, the compression work of sample E is 125.1 mN · mm, and the compression work of sample F Was 167.5 mN · mm, and the compression work of Sample G was 191.7 mN · mm. Looking at the correlation with creases, samples that were more likely to have creases had a greater amount of compression work, and samples that were less likely to have creases had a smaller amount of compression work. Since the samples that are difficult to crease are Samples E, F, and G, it can be seen that the compression work when the crease formation site is compressed by 12 mm should be 200 mN · mm or less. By doing so, it becomes difficult to fold the crease forming part.

[Discussion]
As described above, there is a correlation between the ease of folding of the sheet and the bending strength of the sheet, and the bending strength is higher for the samples that are easier to fold, and the bending strength is lower for the samples that are difficult to fold. became.

  Therefore, as in the first embodiment described above, the rear portion is provided with a highly rigid portion 73 having a high bending strength so as not to include the crease L1 formed in the rear wing 7. Although the structure is provided with the high-rigidity portion 73 in the wing 7, it can be seen that the crease L1 formed in the rear wing 7 is less likely to be creased, and the rear wing 7 is easily adapted to clothes such as shorts.

  As a result of research conducted by the present inventor, theoretically, there is a correlation between the bending strength of the sheet and the compression work of the sheet, and the compression work of the sheet is determined by the above experimental result (evaluation of the compression work). Since it has been found that there is a correlation between the easiness of folding and folding, the bending strength can be defined by the compression work.

  In other words, the high-rigidity portion 73 in the rear wing 7 is formed by providing the high-rigidity portion 73 having a high compression work in the rear wing 7 so as not to include the crease L1 formed in the rear wing 7. Although the structure is provided, the crease L1 formed in the rear wing 7 may be less likely to be creased so that the rear wing 7 can be easily adapted to clothes such as shorts.

  Next, another embodiment of the present invention will be described. In the following embodiments, the description of the configuration and the operational effects of the same configurations as those of the first embodiment described above will be omitted.

“Second Embodiment”
The sanitary napkin 1 according to the second embodiment shown in FIG. 4 is an example in which a low-rigidity portion 75 is partially slit-like in a high-rigidity portion 73. In such a second embodiment, the same operational effects as those of the first embodiment can be obtained.

  Moreover, according to the sanitary napkin 1 of the second embodiment, there is an advantage that the bending strength of the high-rigidity portion 73 can be adjusted by the width and number of slit-like low-rigidity portions 75 in the high-rigidity portion 73. Further, depending on the extending direction of the slit-like low-rigidity portion 75 (for example, by inclining the slit-like low-rigidity portion 75 with respect to the longitudinal direction of the napkin 1), it becomes possible to set a direction in which the high-rigidity portion 73 is easily bent. In addition, there is an advantage that the high-rigidity portion 73 is easily adapted to clothes.

“Third Embodiment”
The sanitary napkin 1 of the third embodiment shown in FIG. 5 is an example in which the front wing 6 is not provided. In the third embodiment, the same effect as that of the first embodiment can be obtained.

“Fourth Embodiment”
The sanitary napkin 1 according to the fourth embodiment shown in FIG. 6 is different from the first embodiment in that the shape of the high-rigidity portion 73 formed in the rear wing 7 is circular. Further, the shape of the high-rigidity portion 73 may be a shape other than a circle, and there is an advantage that the bending strength can be adjusted by changing the size and shape of the high-rigidity portion 73 in this way. In the present invention, the shape of the highly rigid portion should not be particularly limited to the shapes of the first and second embodiments.

“Fifth Embodiment”
In the sanitary napkin 1 of the fifth embodiment shown in FIG. 7, the front wing 6 and the rear wing 7 are continuously provided, and the high rigidity portion 63 of the front wing 6 and the high rigidity portion 73 of the rear wing 7 Is different from the first embodiment in which the high-rigidity portion of the front wing 6 and the high-rigidity portion of the rear wing 7 are discontinuous in that the sanitary napkin 1 is continuously formed in the longitudinal direction. The top sheet 2 is provided with a plurality of openings 19.

  According to the sanitary napkin 1 of the fifth embodiment, the same function and effect as those of the first embodiment can be obtained. Moreover, according to the sanitary napkin 1 of 5th Embodiment, in addition to the effect similar to 1st Embodiment, the highly rigid site | part of the front wing 6 and the highly rigid site | part of the rear wing 7 are used with one reinforcing sheet. And the number of parts can be reduced.

“Sixth and Seventh Embodiments”
In the first to fifth embodiments described above, the high-rigidity portion 73 provided on the rear wing 7 is provided only on the front side in the longitudinal direction of the fold line L1 and is not provided on the rear side in the longitudinal direction of the fold line L1. However, in the present invention, even if the highly rigid portions 73A and 73B are provided on the front side in the longitudinal direction and the rear side in the longitudinal direction of the fold line L1 as in the sixth embodiment in FIG. 8 and the seventh embodiment in FIG. Good.

  In particular, when the adhesive portion 11 is provided in the region C2 on the rear side in the longitudinal direction of the fold line L1 as in the seventh embodiment of FIG. 9, the advantage of providing the high rigidity portion 73B in the region C2 on the rear side in the longitudinal direction of the fold line L1 is great. .

“Eighth Embodiment”
Moreover, in this invention, as shown in 8th Embodiment shown in FIG. 10, the structure which manufactures the wings 6 and / or 7 separately from the said main-body part 1a, and is retrofitted to the main-body part 1a may be sufficient. In addition, FIG. 10 is sectional drawing of the sanitary napkin 1 of 8th Embodiment, Comprising: It is sectional drawing equivalent to FIG. 2 (a) of 1st Embodiment.

“Ninth Embodiment”
Further, in the present invention, as in the ninth embodiment shown in FIG. 11, the top sheet 2 and the back sheet 3 are projected in the width direction from the main body 1 a, respectively. You may form the wings 6 and / or 7 by joining the protrusion part 3b. Note that the high-rigidity portion can be formed by, for example, sandwiching the reinforcing sheet 8 between both protruding portions. In addition, FIG. 11 is sectional drawing of the sanitary napkin 1 of 9th Embodiment, Comprising: It is sectional drawing equivalent to FIG. 2 (a) of 1st Embodiment.

  In the first to ninth embodiments described above, the high-rigidity portion 73 of the rear wing 7 is configured by interposing the single reinforcing sheet 8 between the back sheet 3 and the nonwoven fabric 5. The number of sheets may be two or three, and the number is not limited.

  Moreover, in the above-mentioned 1st Embodiment, after folding the wings 6 and 7 to the main-body part 1a side along the boundary line 21 of the main-body part 1a and the wings 6 and 7, the individual packaging structure folded up 3 times in the longitudinal direction. Although described with an example, in the present invention, the wings 6 and 7 are not folded toward the main body 1a along the boundary line 21 between the main body 1a and the wings 6 and 7, and a plurality of the wings 6 and 7 are not folded. Similar effects can be obtained in the individual wrapping structure.

  In the above embodiment, the sanitary napkin has been described as an example. However, the present invention is not limited to the sanitary napkin, and can be applied to absorbent articles for women such as panty liners and incontinence pads. It can also be applied to other absorbent articles.

  As mentioned above, although the embodiment to which the invention made by the present inventors was applied has been described, the present invention is not limited by the description and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above embodiments are all included in the scope of the present invention.

FIG. 1 is a top view showing an overall configuration of a sanitary napkin as an absorbent article according to a first embodiment of the present invention. 2a is a cross-sectional view of the sanitary napkin taken along the line IIa-IIa in FIG. 1, and FIG. 2b is a cross-sectional view of the sanitary napkin taken along the line IIb-IIb in FIG. FIG. 3 is a diagram showing an individual packaging form of the sanitary napkin of the first embodiment. FIG. 4 is a top view showing the sanitary napkin of the second embodiment. FIG. 5 is a top view showing the sanitary napkin of the third embodiment. FIG. 6 is a top view showing the sanitary napkin of the fourth embodiment. FIG. 7 is a top view showing the sanitary napkin of the fifth embodiment. FIG. 8 is a top view showing the sanitary napkin of the sixth embodiment. FIG. 9 is a top view showing a sanitary napkin according to a seventh embodiment. FIG. 10 is a sectional view showing a sanitary napkin according to an eighth embodiment. FIG. 11 is a cross-sectional view showing a sanitary napkin according to a ninth embodiment. It is a table | surface which shows the experimental result for demonstrating correlation with a crease | fold, bending strength, and a compression work.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin 1a ... Main-body part 2 ... Top sheet 2c ... Both ends in the width direction 2b ... Projection part 3 ... Back sheet 3b ... Projection part 4 ... Absorbent core 5 ... Nonwoven fabric 6 ... Front wing 7 ... Rear wing 8 ... Reinforcing sheet 9 ... Pressing part 10 ... Adhesive part 11 ... Adhesive part 13 ... Wing release sheet 15 ... Packing sheet 17 ... Adhesive tape 19 ... Emboss 21 ... Boundary line 61 ... Low rigidity part 63 ... High rigidity part 73 ... High rigidity part 73A ... High rigidity part 73B ... High rigidity part 75 ... Slit-like low rigidity part A ... Front part B ... Crotch part C ... Back part C1 ... Area C2 ... Area L1, L2, L3 ... Fold

Claims (13)

A vertically long shape having a liquid-permeable surface sheet provided on the skin-side surface, a liquid-impermeable back sheet provided on the clothing-side surface, and an absorbent body interposed between the surface sheet and the back sheet. Body part of
A rear wing that protrudes from the longitudinal rear part of the main body part to both sides in the width direction and is arranged on the wearer's back side when worn,
An absorbent article in which a fold extending in the width direction is formed in the rear wing by being individually wrapped by being folded at least once in the longitudinal direction,
An absorbent article, wherein a high-rigidity portion having high bending strength is provided in the rear wing so as not to include a crease in the rear wing. The absorbent article according to claim 1,
The absorbent article, wherein the high-rigidity part is provided at least in front of the fold in the longitudinal direction. The absorbent article according to claim 2,
The absorbent article, wherein the high-rigidity portions are provided on the front side in the longitudinal direction and the rear side in the longitudinal direction of the fold. The absorbent article according to claim 2,
The absorbent article, wherein the high-rigidity part is provided on the front side in the longitudinal direction without being provided on the rear side in the longitudinal direction of the fold. It is an absorptive article given in any 1 paragraph of Claims 1-4,
An absorbent article, characterized in that an adhesive part for adhesively fixing a clothing side surface of the rear wing to the clothing is provided at a highly rigid portion of the rear wing. It is an absorptive article given in any 1 paragraph of Claims 1-5,
The absorbent article, wherein the high rigidity portion of the rear wing is formed by increasing the number of laminated sheets as compared with other portions of the rear wing. It is an absorptive article given in any 1 paragraph of Claims 1-5,
The rear wing is formed by bonding a plurality of sheets with an adhesive,
The high-rigidity part of the rear wing is formed by increasing the amount of the adhesive per unit area as compared with other parts. It is an absorptive article given in any 1 paragraph of Claims 1-5,
The rear wing is formed by bonding a plurality of sheets with an adhesive,
The absorbent article, wherein the high rigidity portion of the rear wing is a portion formed by embossing and having a higher bending strength than other portions that are not embossed. The absorbent article according to claim 1,
The crease forming part where the crease is formed is formed such that the crease forming part has a lower bending strength than the highly rigid part, so that the crease forming part has a crease more than the highly rigid part. Absorbent article characterized by being difficult. The absorbent article according to claim 9,
The absorbent article characterized in that the crease forming part is made of a material having a bending strength of 60 mm or less in the cantilever method. The absorbent article according to claim 1,
The crease forming part where the crease is formed is formed such that the compression work when the crease formation part is compressed is smaller than the compression work when the high rigidity part is compressed. An absorbent article characterized by being less likely to crease than a rigid part. The absorbent article according to claim 11,
The absorbent article, wherein the crease forming part has a compression work WC of 200 mN · mm or less when the crease forming part is compressed by 12 mm. The absorbent article according to claim 1,
The crease forming portion where the fold is formed is formed such that the number of sheets stacked is smaller than that of the high-rigidity portion, so that the crease is less likely to be formed than the high-rigidity portion. Sex goods.

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