JP6159121B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article including an absorbent main body including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided between the top sheet and the back sheet.

  Conventionally, in an absorbent article such as a sanitary napkin, an absorbent main body comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided between the top sheet and the back sheet. The shape which provides a pair of wing part extended in the width direction outer side is provided widely in the both sides of an absorptive main-body part.

  Further, in this type of absorbent article, when the absorbent article is attached to the undergarment, the absorbent body is arranged along the shape of the crotch part of the undergarment, so that the absorbent body is at the center in the front-rear direction. Some have been proposed that are recessed inward in the width direction (see, for example, Patent Document 1).

JP 2010-136973 A

  However, when the above-described absorbent article is used for a long time, the absorbent body may shrink inward in the width direction, and as a result, the absorbent body may be twisted. In such a case, due to the generated twist, there is a problem that the adherence between the wearer's bodily fluid excretion opening and the excretion opening contact region in contact with the bodily fluid discharge opening is lowered, resulting in leakage of bodily fluids. .

  In particular, in the case of emerging countries and the like, when it cannot be exchanged many times a day due to economic circumstances and customary circumstances, the absorbent article is used for a longer time, and thus body fluid leakage occurs more remarkably.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the absorbent article which improved the bodily fluid leak resulting from a twist.

  The absorbent article (absorbent article 1) according to the present invention has a front-rear direction and a width direction orthogonal to the front-rear direction, a liquid-permeable top sheet (top sheet 10), and a liquid-impermeable back surface. An absorbent body part (absorbent body part 2) including a sheet (back sheet 20) and an absorbent body (absorbent body 30) provided between the top sheet and the back sheet; The absorbent article has a pair of wing portions (wing portions 43, 44) extending outward in the width direction on both sides in the width direction, and the absorbent main body portion is located in the front direction of the pair of wing portions. A wing area (wing area CA) located from the base to the rear base of the pair of wing parts, a front area (front area FA) located in front of the wing area, and more than the wing area Rear part located behind (The rear area BA), and the length in the width direction (length W1) of the absorber at the front-rear direction center of the wing area is at least the front area of the front area and the rear area The gist is that it is larger than the maximum length (length W2A) in the width direction of the absorber.

  According to this indication, an absorptive article which improved body fluid leakage resulting from twisting can be provided.

It is the top view seen from the skin contact surface side of the absorptive article concerning an embodiment. It is a schematic cross section of the XX cross section shown in FIG. It is a schematic cross section of the YY cross section shown in FIG. It is a figure for demonstrating the measurement position of the fabric weight of the absorbent article which concerns on embodiment. FIG. 5A is a schematic cross-sectional view showing a state in which an absorbent article according to the prior art is mounted. FIG. 5B is a schematic cross-sectional view showing a state where the absorbent article according to this embodiment is mounted.

  With reference to drawings, the absorbent article 1 which concerns on embodiment is demonstrated. FIG. 1 is a plan view of the absorbent article, and FIG. 2 is a cross-sectional view taken along line XX shown in FIG. 3 is a cross-sectional view taken along line YY shown in FIG. The absorbent article 1 according to the present embodiment is, for example, a sanitary napkin.

  The absorbent article according to the embodiment is a daytime sanitary napkin. Therefore, in the absorbent article according to the present embodiment, the lengths of the front area FA located on the front side of the wearer in the front-rear direction L (longitudinal direction) and the rear area BA located on the rear side of the wearer are approximately. The same.

  In addition, the area | region between a pair of wing parts 43 and 44 mentioned later is the wing area | region CA containing the excretion opening | mouth contact | abutting area | region where a wearer's excretion opening contacts. Specifically, a wing area CA is provided between the front root CA1 of the pair of wing portions 43 and 44 and the rear root CA2 of the pair of wing portions 43 and 44. The front side of the wing area CA is the front area FA, and the rear side of the wing area CA is the rear area BA. In FIG. 1, the center line in the front-rear direction L of the absorbent article 1 is shown as the front-rear direction center line LCL, and the center line in the width direction W of the absorbent article 1 is shown as the width-direction center line WCL. ing. The center of the wing area CA is a position where the front-rear direction center line LCL and the width direction center line WCL intersect.

  In the present embodiment, a daytime sanitary napkin is described as an example, but the absorbent article according to the present invention can also be applied to a night sanitary napkin. The sanitary napkin for night use is configured such that the rear region BA located on the rear side of the wearer is longer than the front region FA located on the front side of the wearer in the front-rear direction L.

  The absorbent article 1 includes an absorbent main body 2. The absorptive main body 2 includes a top sheet 10 that comes into contact with the skin of the wearer, a liquid-impermeable back sheet 20 that does not transmit liquid, and an absorber 30. The absorber 30 is disposed between the top sheet 10 and the back sheet 20. Therefore, the absorber 30 is shown with a broken line in FIG.1 and FIG.2.

  The absorbent article 1 has a pair of wing portions 43 and 44 extending outward in the width direction W on both sides in the width direction W of the absorbent main body 2 in a plan view shown in FIG.

Furthermore, the absorbent article 1 includes side sheets 41 and 42 provided outside the absorber 30 in the width direction W.

  The top sheet 10 is a liquid-permeable sheet that transmits liquid such as body fluid. The top sheet 10 covers at least the surface of the absorber 30. The top sheet 10 is not particularly limited as long as it is a sheet-like material having a structure that allows liquid to permeate, such as a nonwoven fabric, a woven fabric, a perforated plastic sheet, and a mesh sheet. Either natural fibers or chemical fibers can be used as the woven or non-woven material.

  Examples of natural fibers include cellulose such as pulverized pulp and cotton. Examples of the chemical fiber include regenerated cellulose such as rayon and fibril rayon, semi-synthetic cellulose such as acetate and triacetate, thermoplastic hydrophobic chemical fiber, and thermoplastic hydrophobic chemical fiber subjected to hydrophilic treatment.

  Examples of the thermoplastic hydrophobic chemical fibers include single fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), fibers obtained by graft polymerization of PE and PP, and composite fibers such as a core-sheath structure. As mentioned.

  In particular, for non-woven fabrics, web forming may be performed by any of dry methods (card method, spun bond method melt blown method, air laid method, etc.), wet methods, or a combination of a plurality of them. Examples of bonding methods include thermal bonding, needle punching, chemical bonding, and the like, but are not particularly limited to these methods. Moreover, you may use the spunlace formed in the sheet form by the hydroentanglement method.

  As the perforated plastic sheet, a perforated sheet of a thermoplastic resin such as PE, PP, and PET, a porous foam material, or the like can be used. Moreover, about these, it is also preferable to make it cloudy by mixing the filler which consists of a titanium oxide, a calcium carbonate, etc. in the range of 0.5 to 10% as needed. Moreover, you may use the perforated film which opened the film which consists of the said thermoplastic resin by perforation, heat embossing, or machining. The perforated film may be used as a composite sheet with a nonwoven fabric.

  The back sheet 20 has substantially the same length as that of the top sheet 10. As the back sheet 20, a polyethylene sheet, a laminated nonwoven fabric mainly composed of polypropylene, a breathable resin film, a spunbond, a sheet obtained by bonding a breathable resin film to a nonwoven fabric such as spunlace, or the like can be used. The back sheet 20 is preferably made of a material having flexibility that does not cause discomfort when worn. For example, a film obtained from a basis weight of 15 to 30 g / m <2> mainly composed of a low density polyethylene (LDPE) resin is used. Can be used. The back sheet 20 is desirably liquid-impervious and moisture-permeable, and can be constituted by a microporous sheet obtained by stretching a melt-kneaded inorganic filler such as polyethylene or polypropylene. .

  The absorber 30 includes hydrophilic fibers and pulp. The absorber 30 is formed of a material that can absorb body fluid such as menstrual blood. Examples include pulverized pulp, cellulose such as cotton, regenerated cellulose such as rayon and fibril rayon, semi-synthetic cellulose such as acetate and triacetate, particulate polymer, fibrous polymer, thermoplastic hydrophobic chemical fiber, or hydrophilic treatment. The thermoplastic hydrophobic chemical fibers, air bonded pulp treated with chemical bonds, etc. can be used alone or in combination.

  The method for forming these materials into the absorbent body is not particularly limited, but for example, a sheet formed by an airlaid method, a meltblown method, a spunlace method, a papermaking method or the like is used. Moreover, a cellulose foam, a synthetic resin continuous foam, etc. can also be used as an absorber. Furthermore, it is also possible to use what was formed into an absorber after pulverizing the foam or the sheeted material. Among these, the pulp is mixed in the range of 80 to 100% and the particulate polymer is mixed in the range of 20 to 0%, and the upper layer on the skin contact side of the absorber or the lower layer on the non-skin contact side of the absorber. An absorbent body having a basis weight of 100 to 2000 g / m 2 and a bulk of 1 to 50 mm formed by arranging an SMS nonwoven fabric sheet can be mentioned. In addition, an SMS nonwoven fabric sheet may be arranged in both the upper layer and the lower layer in the absorber.

  In addition, it is preferable that the absorber 30 which concerns on this Embodiment has not arrange | positioned the SMS nonwoven fabric sheet in the upper layer. In this case, since the SMS nonwoven fabric sheet is not disposed in the upper layer, the wet state is obtained, and peeling of the compressed groove 80 is difficult to occur. Thereby, even if it uses for a long time environment, the pressing groove 80 becomes difficult to collapse, and it becomes difficult to generate | occur | produce a twist. In addition, since the SMS nonwoven fabric sheet is not disposed in the upper layer, the body fluid is transferred directly from the top sheet 10 to the pulp, so that the absorption speed is increased and body fluid leakage can be prevented.

  Moreover, it is preferable that a long fiber sheet is arrange | positioned as an SMS nonwoven fabric sheet arrange | positioned at the lower layer of an absorber, and the pressing groove 80 mentioned later is simultaneously formed in the said long fiber sheet. In this case, since it is integrated from the upper layer of the absorber to the lower layer of the absorber, the entire absorber becomes difficult to twist.

  The absorbent body 30 may be formed by laminating hydrophilic fibers or powder by the airlaid method, an airlaid sheet obtained by forming hydrophilic fibers or powder into a sheet shape by the airlaid method, or a tissue (for example, It may be formed by placing pulverized pulp mixed with a superabsorbent polymer on a basis weight of 15 g / m2) and wrapping it with a tissue.

  The absorbent body 30 according to the present embodiment is configured by wrapping a pulp obtained by laminating cotton-like pulp, synthetic pulp or the like at a basis weight of about 100 to 300 g / m 2 with protective paper (not shown). The protective paper is for maintaining the shape of the pulp, and for example, crepe paper or tissue paper can be used.

  The absorber 30 has a shape extending in the front-rear direction, and is approximately one size smaller than the back sheet 20. The length of the absorbent body 30 in the width direction W corresponds to the crotch interval of an adult female and is approximately 50 to 80 mm. The absorber 30 is bonded to the back sheet 20 with an adhesive such as hot melt.

Further, as shown in FIG. 1, the absorber 30 according to the present embodiment has a length W1 in the width direction W of the absorber 30 at the center in the front-rear direction L of the wing area CA. Among these, at least the maximum length W2A in the width direction W of the absorber 30 in the front region FA is larger. In the present embodiment, the maximum length W 2 A in the width direction W of the absorber 30 in the front region FA and the maximum length W 2 B in the width direction W of the absorber 30 in the rear region BA are substantially the same. . Therefore, in the present embodiment, as shown in FIG. 1, the length W1 of the absorber 30 in the width direction W is equal to the maximum length W2A of the absorber 30 in the width direction W in the front region FA and the absorption in the rear region BA. maximum length in the width direction W of the body 30 W2 greater than B.

In the present embodiment, description will be given focusing on the maximum length W2A in the width direction W of the absorber 30 in the front region FA. However, in the modification, even if the maximum length W 2 A in the width direction W of the absorber 30 in the front region FA and the maximum length W 2 B in the width direction W of the absorber 30 in the rear region BA are different. Good. In this case, the length W1 of the absorber 30 in the width direction W is configured to be at least larger than the maximum length W2A of the absorber 30 in the width direction W in the front region FA.

  In the present embodiment, the length W1 of the absorbent body 30 in the width direction W at the center in the front-rear direction L of the wing area CA is equal to the length in the width direction W of the absorber 30 at the outer end in the front-rear direction L of the wing area CA. Greater than W3.

  Specifically, the absorber 30 has a convex portion 31 that is convex outward in the width direction W at the center in the front-rear direction L of the wing area CA. The absorber 30 has convex portions 31 on both outer sides in the width direction W. By providing the convex portion 31, the length W1 in the width direction W of the absorber 30 is larger than the length W3 in the width direction W of the absorber 30 at the outer end in the front-rear direction L of the wing area CA. . In addition, it is preferable that the difference of the length W1 of the width direction W and the length W3 of the width direction W is 10 mm-40 mm. That is, it is preferable that the amount of protrusion of one convex portion 31 toward the outside in the width direction W is 5 to 20 mm. If the difference between the length W <b> 1 in the width direction W and the length W <b> 3 in the width direction W is less than 10 mm, the effect of increasing the rigidity of the absorbent body 30 by providing the protrusions 31 may be reduced. If the difference between the length W1 in the width direction W and the length W3 in the width direction W is greater than 20 mm, the rigidity of the convex portion 31 cannot be ensured, and there is a risk that it will be twisted.

In the present embodiment, both end portions on the outer side in the width direction W of the absorber 30 extend in parallel with the front-rear direction L from the end portion on the outer side in the front-rear direction L of the wing region CA to the inside of the rear region BA. Accordingly, in the present embodiment, the length W3 in the width direction W of the absorber 30 in the longitudinal direction L outer end of the wing area CA, and the maximum length W2 B in the width direction W of the absorber 30 in the rear region BA Are the same.

  Moreover, it is preferable that length L31 in the front-back direction L of the convex part 31 of the absorber 30 is shorter than length La in the front-back direction L of the inner pressing groove 81 mentioned later.

  The side sheets 41 and 42 are disposed on both sides of the top sheet 10. The side sheets 41 and 42 can be selected from the same material as the top sheet 10. However, in order to prevent menstrual blood from flowing over the side sheets 41 and 42 to the outside of the absorbent article 1, it is preferable to have hydrophobicity or water repellency. The side sheets 41 and 42 cover a part of the side edge of the absorber 30 and the wing parts 43 and 44.

  In the absorbent article 1, the periphery of the surface sheet 10, the side sheets 41 and 42, and the back sheet 20 is joined, and the absorber 30 is enclosed. As a method for joining the top sheet 10 and the back sheet 20, any one or a combination of heat embossing, ultrasonic waves, or hot melt adhesive can be used.

  In the back sheet 20, an adhesive (not shown) is applied to the surface in contact with the undergarment in a plurality of regions. The adhesive is intermittently disposed along the front-rear direction L on the back surface side of the absorber. The adhesive is also provided on the surface in contact with the undergarment in the wing part 43 and the wing part 44. In a state before use, the adhesive is in contact with a release sheet (not shown). The release sheet prevents the adhesive from deteriorating before use. And a peeling sheet peels by a wearer at the time of use.

  In addition, in the absorbent article which does not have a peeling sheet, you may be comprised so that it may prevent that an adhesive deteriorates before use with the packaging sheet which wraps an absorbent article separately. When the adhesive and the packaging sheet are in contact with each other, it is desirable that the surface of the packaging sheet be treated so that the adhesive can be peeled without reducing the adhesive strength of the adhesive.

  In the back sheet 20, it is preferable that the adhesives are arranged in multiple rows with a predetermined width along the front-rear direction L on the back side of the absorber 30.

  In this case, the predetermined width in the width direction W of the pressure-sensitive adhesive is preferably 3 mm to 5 mm, and the pitch between the pressure-sensitive adhesives is preferably 2 mm to 4 mm, which is narrower than the length in the width direction W of the pressure-sensitive adhesive. If the pitch between the pressure-sensitive adhesives is wider than the length in the width direction W of the pressure-sensitive adhesive, there is a risk of twisting between them, but it becomes difficult to twist due to being narrower than the length of the pressure-sensitive adhesive in the width direction W.

  The absorbent article 1 has a compressed groove 80 formed by compressing the topsheet 10 and the absorbent body 30 in the thickness direction. The compressed groove 80 is a groove formed by processing the skin contact side of the top sheet of the absorbent article 1 and the non-skin contact side (clothing contact surface side) of the absorbent body 30. .

  In the absorbent article 1, at least a pair of squeezing grooves 80 that squeeze the topsheet 10 and the absorbent body 30 are disposed along the front-rear direction L. Moreover, the space | interval of a pair of pressing groove 80 in the front-back direction L center of wing area | region CA is larger than the space | interval of a pair of pressing groove 80 in the edge part of the front-back direction L outer side of wing area | region CA. That is, the squeezing groove 80 is configured to spread outward in the width direction W at the center in the front-rear direction L of the wing area CA.

  Specifically, as shown in FIG. 1, the pressing groove 80 includes an inner pressing groove 81 and an outer pressing groove 82 disposed on the outer side in the width direction than the inner pressing groove 81. A distance W4 between the pair of outer pressing grooves 82 at the center in the front-rear direction L of the wing area CA is larger than a distance W5 between the pair of outer pressing grooves 82 at the end portion on the outer side in the front-rear direction L of the wing area CA. That is, the outer pressing groove 82 is configured to spread outward in the width direction W.

  Here, the absorber 30 also has a convex portion 31 that is convex outward in the width direction W at the center in the front-rear direction L of the wing area CA. Moreover, it becomes the structure which follows the shape of the convex part 31 of the absorber 30 because the outer pressing groove 82 is comprised so that it may spread on the outer side of the width direction W in the center of the front-back direction L of the wing area | region CA. . Thus, the force which acts on the width direction W inner side of the absorbent article 1 in the center of the front-back direction L of the wing area | region CA is comprised so that the pressing groove 80 may follow the shape of the convex part 31 of the absorber 30. Therefore, the twist which generate | occur | produces in the front-back direction L center of wing area | region CA can be suppressed.

  At least one of the inner pressing groove 81 and the outer pressing groove 82 has a continuous annular shape. In this embodiment, the case where both the inner pressing groove 81 and the outer pressing groove 82 are annular will be described as an example.

  The squeezing groove 80 is provided around the wing area CA including the center of the excretion opening contact area that is disposed to face the excretion opening of the wearer.

  The center of the excretory opening contact area coincides with the center in the front-rear direction L and the width direction of the wing area CA in which the wearer's excretion opening contacts. For example, in an absorbent article having a wing portion, the center in the front-rear direction L of the wing portions 43, 44 is the center in the front-rear direction L of the wing region CA. Moreover, in the absorbent article which does not have the wing parts 43 and 44, the position where the length dimension of the width direction of an absorber is the longest becomes the center of the front-back direction L of the wing area | region CA. The excretory opening contact region is included in a region that contacts the wearer's crotch, and is located between the wearer's legs.

  In addition, in the back surface sheet 20, when adhesives are arrange | positioned with multiple rows, the adhesive located in the outermost width direction W among these adhesives is arrange | positioned on the outer side of the width direction W of the outer pressing groove 82 mentioned later. It is preferable that According to this, since the adhesive located on the outermost side in the width direction W among the adhesives arranged in multiple rows is provided up to the outer side in the width direction W of the outer compressed groove 82, the force received by the attachment of the underwear is It becomes easy to receive force on the outer side in the width direction W between the inner pressing groove 81 and the outer pressing groove 82. Therefore, the area | region inside the inner side compressed groove 81 becomes difficult to twist.

  A plurality of point-like compressed parts 90 are formed in the front area FA and the rear area BA. Specifically, the plurality of point-like compressed portions 90 are disposed in the width direction W inside of the outer compressed groove 82 and are arranged in a dispersed state.

  In the front area FA and / or the rear area BA, the basis weight of the absorber 30 on the side portion in the width direction W is higher than the basis weight of the absorber 30 in the center in the width direction W.

  It is the front area FA and / or the rear area BA, and the basis weight of the absorber 30 at the side part in the width direction W is higher than the basis weight of the absorber 30 at the side part in the width direction W of the wing area CA.

  In addition, the fabric weight and density of an absorber can be measured with the following measuring methods, for example. In the absorbent article packaged by the packaging body, the packaging body is opened, the folded absorbent article is developed, and the thickness and area of the portion where the basis weight and density are measured are measured. Subsequently, the part which measures a fabric weight and a density is cut out from an absorbent article, and the weight of the cut-out part is measured. Next, parts other than the absorber, such as the top sheet and the back sheet, are removed from the cut out part, and the weight of the absorber is measured. The basis weight is calculated based on the weight of the absorbent body and the area of the portion where the basis weight and density are measured. The density is calculated based on the basis weight and thickness.

  In the present embodiment, as shown in FIG. 4, in the absorbent article 1, a sample of the absorbent body 30 alone is created and its weight is measured. The sample size is preferably set to the following size in order to increase the accuracy of the measurement result. Specifically, the length LS in the width direction W of the sample is 10 mm, and the length LT in the front-rear direction L of the sample is preferably 40 mm.

  As shown in FIG. 4, in the front area FA, the sample area at the center in the width direction W is SF1, the sample area at one of the side parts in the width direction W is SF2, and one of the side parts in the width direction W is one. The region of the sample at is shown as SF3. In the wing area CA, the sample area at the center in the width direction W is SC1, the sample area on one side in the width direction W is SC2, and the sample area on one side in the width direction W is SC3. Show. In the rear area BA, the sample area at the center in the width direction W is SB1, the sample area on one side in the width direction W is SB2, and the sample area on one side in the width direction W is SB3. Show. Moreover, when the shape of the side part of the width direction W of the absorber 30 is curving, the area | region of this sample is moved inside the width direction W until a square shape is securable.

  In the example of FIG. 4, in this embodiment, the basis weight in SF2 to SF3 is higher than the basis weight in SF1, and the basis weight in SB2 to SB3 is higher than the basis weight in SB1. Moreover, the basis weight in SF2 to SF3 is higher than the basis weight in SC2 to SC3, and the basis weight in SB2 to SB3 is higher than the basis weight in SC2 to SC3.

  Moreover, it is preferable that the pressing groove 80 exists inside the area | region where the fabric weight in the width direction W of the absorber 30 is the highest. The body fluid moves to a dense region by a capillary effect rather than a region with a coarse basis weight, but the compression groove 80 becomes a leak-proof wall by providing the compressed groove 80 inside the region with a high basis weight on the outer side in the width direction W. , Body fluid leakage can be reduced. Moreover, since the groove | channel with high rigidity is formed by the pressing groove 80, even if it receives the force which goes to the inner side of the width direction W, the absorber 30 becomes difficult to twist inside the width direction W. Therefore, even if it is a case where an absorptive article is used for a long time, the twist which occurs in an absorptive article can be controlled.

(Method for manufacturing absorbent article)
Next, a part of manufacturing method of the absorbent article 1 according to the present embodiment will be described. In addition, about the method which is not demonstrated, the existing method can be used. The manufacturing method of an absorbent article performs a sheet | seat production | generation process as a 1st step. Next, as a second step, a sheet joining process is performed. Specifically, the top sheet 10 and the side sheets 41 and 42 are bonded by, for example, heat welding.

  As a third step, an absorber molding process is performed. Specifically, the absorber 30 is formed by molding pulp as a material of the absorber with a molding drum. Note that the order of the sheet generation process in the first step and the second step and the absorbent body molding process in the third step may be reversed.

  In the fourth step, a joining process is performed. Specifically, the joining process which joins the absorber 30 shape | molded in the 3rd step, and the surface sheet and side sheet which were joined in the 2nd step is performed.

  In the fifth step, the forming step of the compressed groove 5 is performed. Specifically, the top sheet 10 and the absorbent body 30 are compressed in the thickness direction, and the pressing groove 80 and the point-like pressing part 90 are formed.

  In the sixth step, a back sheet joining step is performed. Specifically, the absorbent body 30 and the top sheet 10 in which the compressed grooves are formed, the side sheets 41 and 42, and the back sheet 20 are joined by application of a hot melt adhesive.

  Then, the process of apply | coating the adhesive agent as a slip prevention material to the non-skin contact side (clothing contact surface side) of the back surface sheet 20, a folding process, and the packaging process of the absorbent article 1 are performed. The absorbent article which concerns on this Embodiment can be manufactured according to said process.

(Function and effect)
In the absorbent article 1 according to the present embodiment, the length W1 of the absorber 30 at the center in the front-rear direction L of the wing area CA is the length W2 A of the absorber 30 in the width direction W in the front area FA and the rear area BA . Greater than W2B . Therefore, according to such an absorbent article, the length in the width direction of the absorber at the front-rear direction L center of the wing area CA of the absorber is the maximum length W in the width direction of the absorber in the front area FA and the rear area BA. Compared to the case where it is smaller than 2 A and W 2 B, that is, compared to the absorbent article formed so as to be recessed inward in the width direction of the absorber at the center in the front-rear direction of the wing region of the absorber. Since the strength inward in the width direction W of 1 is increased, the twist generated at the center in the front-rear direction L of the wing area CA can be suppressed.

  Here, FIG. 5A is a schematic diagram showing a state in which the force F acts toward the inside in the width direction W by the force of the crotch leg when the absorbent article according to the related art is mounted. FIG. 5B is a schematic diagram showing a state where the force F acts toward the inside in the width direction W by the force of the leg of the crotch when the absorbent article according to the present embodiment is mounted. It is shown. 5A to 5B are cross-sectional views based on the line XX shown in FIG.

  In the absorbent article according to the prior art, the length W1 in the width direction of the absorbent body at the center in the front-rear direction L of the wing area CA of the absorbent body is equal to the front area FA and the rear area BA, as much as the convex portion 31 is not provided. Is configured to be equal to or smaller than the maximum lengths W2A and W2B in the width direction of the absorber. In such an absorbent article, as shown in FIG. 5A, when receiving the force F received on the inner side in the width direction W, the absorbent body 30 does not have the convex portion 31, and the inner side in the width direction W. The absorber 30 is twisted inward in the width direction W. Thus, the twist generated in the absorber of the wing area CA is transmitted to the front area FA and the rear area BA, and the absorber in the front area FA and the rear area BA is also twisted at the same time. As described above, due to the twist generated in the wing area CA, not only the wing area CA but also the absorbers in the front area FA and the rear area BA are twisted, so that body fluid leaks.

  On the other hand, as shown in FIG. 5 (b), in the absorbent article 1 according to this embodiment, the absorbent body 30 has the convex portion 31, so that the convex portion 31 faces inward in the width direction W. Can accept force F. Thereby, the twist which generate | occur | produces toward the inner side of the width direction W can be suppressed in the front-back direction L center of wing area | region CA. Furthermore, by suppressing the twist in the absorber 30 of the wing area | region CA, it can also suppress that the absorber in the front area | region FA and back area BA originates in this. Therefore, according to the absorbent article 1, not only the twist generated in the absorber 30 in the wing area CA can be suppressed, but also the twist of the absorber in the front area FA and the rear area BA can be prevented. Body fluid leakage can be improved.

  Furthermore, the twist which generate | occur | produces in the front-back direction L center of the wing area | region CA which concerns on this embodiment can be suppressed over a long time. Therefore, even if it is not possible to exchange it many times a day due to economic circumstances and customary circumstances, such as in emerging countries, even if the absorbent article is used for a longer period of time, it suppresses twisting that occurs in the absorbent article Therefore, it is possible to improve body fluid leakage due to twisting.

  The length W1 in the width direction W of the absorber 30 at the center in the front-rear direction L of the wing region CA is larger than the length W2 in the width direction W of the absorber 30 at the outer end in the front-rear direction L of the wing region CA.

  Specifically, the absorber 30 has a convex portion 31 that is convex outward in the width direction W at the center in the front-rear direction L of the wing area CA. According to this, at the center in the front-rear direction L of the wing area CA, the strength of the absorbent article 1 toward the inner side in the width direction W is increased, and the twist can be reliably suppressed. Here, generally, the front-rear direction L center of the wing area CA is located at least in the excretion opening contact area in contact with the body fluid excretion opening of the wearer when the absorbent article 1 is mounted. Therefore, the body fluid leakage resulting from the twist can be further improved by reliably suppressing the twist generated at the center in the front-rear direction L of the wing area CA.

  In addition, as a method of increasing the strength of the absorbent article 1 toward the inner side in the width direction W, it is conceivable to increase the width of the absorbent body 30 in the width direction W as a whole. Therefore, it is not preferable. In particular, the front area FA is an area where the wearer's undercarriage moves particularly. Therefore, when the length in the width direction W of the absorber 30 in the front area FA is larger than the length in the width direction W of the absorber 30 in the wing area CA, the wearer feels uncomfortable because it easily rubs around the wearer's legs. It becomes easy to give.

  Moreover, in the absorbent article which concerns on a prior art, when the wearer is moving generally, the bodily fluid leakage from the width direction W is easy to occur, and when it uses for a long time, the allowable amount of the bodily fluid of an absorber is immediately It will be satisfied. In the absorbent article 1 according to the present embodiment, the volume of the absorbent body 30 is increased by the amount of the convex portion 31 that protrudes outward in the width direction W, so that the amount of body fluid allowed is increased and body fluid leakage can be prevented. . Moreover, since there is much tolerance of a bodily fluid, when a wearer looks at the absorbent article 1, a wearer can also be provided with a sense of security.

  Further, since the convex portion 31 is provided and widened in the width direction W, when the absorbent article is mounted, the convex portion 31 fits into the crotch and a space is formed between the absorber 30 and the crotch. Can be prevented. Moreover, since the wearer can feel the presence of the absorber 30 in the crotch, the wearer can be given a sense of security. Moreover, since the convex part 31 is provided, when attaching the absorbent article 1 to underwear, the convex part 31 becomes a mark and it becomes easy for a user to grasp | ascertain a mounting position. Therefore, the absorbent article can be mounted at a correct position, and the mounting position is hardly displaced.

  Further, the center of the convex portion 31 of the absorber 30 in the front-rear direction L is disposed at substantially the same position as the center of the wing portions 43, 44 in the front-rear direction L, and the length L31 of the convex portion in the front-rear direction L is It is preferable that the length is equal to or less than the length of the wing portions 43 and 44 in the front-rear direction L.

  By combining the position of the convex part 31 in the front-rear direction L and the position of the wing parts 43, 44 in the front-rear direction L, when the absorbent article 1 is mounted, the effect of making the absorber 30 difficult to twist is exhibited to the maximum. it can. The force pressed inward in the width direction by the wearer's leg relates to the entire wing region. If the length of the convex portion 31 in the front-rear direction L is extremely short with respect to the length of the wing portions 43, 44 in the front-rear direction L, the force received inside the width direction W cannot be received. On the other hand, if the length is too long, not only does the wearer feel uncomfortable, but the force received on the inner side in the width direction W is transmitted back and forth, so that the absorbent article 1 as a whole is easily swung.

  Moreover, the space | interval of a pair of pressing groove 80 in the front-back direction L center of wing area | region CA is larger than the space | interval of a pair of pressing groove 80 in the edge part of the front-back direction L outer side of wing area | region CA. That is, the squeezing groove 80 is configured to spread outward in the width direction W at the center in the front-rear direction L of the wing area CA.

  Specifically, the pressing groove 80 includes an inner pressing groove 81 and an outer pressing groove 82 disposed on the outer side in the width direction than the inner pressing groove 81. Further, a distance W4 between the pair of outer pressing grooves 82 at the center in the front-rear direction L of the wing area CA is larger than a distance W5 between the pair of outer pressing grooves 82 at the end portion on the outer side in the front-rear direction L of the wing area CA.

  Here, the absorber 30 also has a convex portion 31 that is convex outward in the width direction W at the center in the front-rear direction L of the wing area CA. Moreover, it becomes the structure which follows the shape of the convex part 31 of the absorber 30 because the outer pressing groove 82 is comprised so that it may spread on the outer side of the width direction W in the center of the front-back direction L of the wing area | region CA. . In this way, the compressed groove 80 is configured to follow the shape of the convex portion 31 of the absorbent body 30, so that the strength of the absorbent article 1 toward the inner side in the width direction W is obtained at the center in the front-rear direction L of the wing region CA. Therefore, the twist which generate | occur | produces in the front-back direction L center of wing area | region CA can be suppressed.

  Moreover, in this embodiment, the inner side compressed groove 81 and the outer side compressed groove 82 arrange | positioned rather than the inner side compressed groove 81 are included as the compressed groove 80 in the front-back direction center of the wing area | region CA. According to this, since the squeezing groove is provided by the double of the inner squeezing groove 81 and the outer squeezing groove 82, deformation in the width direction W inside of the inner squeezing groove 81 is less likely to occur. The twist which generate | occur | produces in the front-back direction L center can be suppressed.

  Moreover, it is preferable that length L31 in the front-back direction L of the convex part 31 of the absorber 30 is shorter than length La in the front-back direction L of the inner pressing groove 81. The length L31 in the front-rear direction L of the convex portion 31 is shorter than the length La in the front-rear direction L of the inner pressing groove 81, so that the force applied from the outer side in the width direction W to the inner pressing groove 81 and the outer pressing groove Therefore, the effect of suppressing the twist in the width direction W is increased.

  According to this embodiment, at least one of the inner pressing groove 81 and the outer pressing groove 82 is a continuous ring. According to this, since the rigidity in the area | region inside the width direction W of the inner side pressing groove 81 and the outer side pressing groove 82 is ensured, the twist of the absorber 30 can be suppressed.

  In the front area FA and / or the rear area BA, the basis weight of the absorber 30 on the side portion in the width direction W is higher than the basis weight of the absorber 30 in the center in the width direction W.

Specifically, as shown in FIG. 4, the basis weight in SF2 to SF3 is higher than the basis weight in SF1. Further, the basis weight in SB2 to SB3 is higher than the basis weight in SB1.

  According to this, in the front area FA and the rear area BA, the rigidity in the side part in the width direction W is set higher than the rigidity in the center in the width direction W. It becomes difficult to twist inside the width direction W by the force of the foot. Further, even if the absorber 30 in the wing area CA is twisted inward in the width direction W, it is difficult to be transmitted in the front-rear direction L through the absorber 30 in the wing area CA. As a result, the twist is less likely to occur in the front area FA and the rear area BA. Moreover, even if it is a case where an absorbent article is utilized over a long time, the twist which generate | occur | produces in an absorbent article can be suppressed.

  It is the front area FA and / or the rear area BA, and the basis weight of the absorber 30 at the side part in the width direction W is higher than the basis weight of the absorber 30 at the side part in the width direction of the wing area CA. Specifically, as shown in FIG. 4, the basis weight in SF2 to SF3 is higher than the basis weight in SC2 to SC3.

  According to this, the force received from the width direction by increasing the basis weight of the absorber 30 in the side portion of the front area FA and / or the rear area BA is received by the portion where the basis weight is increased, and the central absorption surface is made flat. Can keep. Further, even if the absorber 30 in the wing area CA is twisted, it is difficult for the twist to be transmitted from the side of the absorber 30 in the wing area CA to the side of the front area FA and / or the rear area BA. Therefore, the twist of the absorber of front area | region FA and / or back area | region BA can be suppressed.

  A plurality of point-like compressed parts 90 are formed in the front area FA and the rear area BA. Specifically, it is formed in a state where a plurality of point-like compressed parts 90 are dispersed.

Thereby, planar rigidity is ensured in the absorber 30 in the front area FA and the rear area BA, and the absorber 30 in the front area FA and the rear area BA becomes more difficult to twist. Therefore, even when the absorbent article is used for a longer time, the twist generated in the absorbent article can be suppressed. Moreover, air permeability can be improved by forming the point-shaped pressing part 90 compared with the case where a pressing groove is formed.

(Other embodiments)
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  For example, the absorbent article is not limited to a sanitary napkin, and may be an absorbent pad or a panty liner. Further, for example, in the absorbent article, a gather may be formed at the outer end in the width direction of the absorbent body.

DESCRIPTION OF SYMBOLS 1 ... Absorbent article 2 ... Absorbent main-body part 10 ... Top sheet 20 ... Back sheet 30 ... Absorber 31 ... Convex part 41, 42 ... Side sheet 43, 44 ... Wing part 80 ... Squeeze groove 81 ... Inner squeeze groove 82 ... Outer squeezing groove 90 ... point-like pressing part BA ... rear area CA ... wing area FA ... front area W ... width direction

Claims (9)

Having a front-rear direction and a width direction orthogonal to the front-rear direction;
A liquid permeable top sheet, a liquid impermeable back sheet, and an absorbent main body including an absorbent body provided between the top sheet and the back sheet,
An absorbent article having a pair of wings extending outward in the width direction on both sides of the absorbent main body in the width direction,
The absorptive main body includes a wing region located from a front root of the pair of wing portions to a rear root of the pair of wing portions, a front region located forward of the wing region, and the wing A rear region located behind the region,
The length in the width direction of the absorber at the center in the front-rear direction of the wing region is greater than the maximum length in the width direction of the absorber in at least the front region of the front region and the rear region. The
The absorbent article according to claim 1, wherein the length in the width direction of the absorber at the center in the front-rear direction of the wing region is the maximum length in the width direction of the absorber in the wing region. The absorbent article according to claim 1, wherein the absorbent body has a convex portion that is convex outward in the width direction at the center of the wing region . In the absorbent article, at least a pair of squeezing grooves for squeezing the topsheet and the absorbent body are disposed along the front-rear direction,
The interval between the pair of compressed grooves in the longitudinal direction of the center of the wing area is characterized when's go magnitude than the distance between the pair of compressed grooves in the longitudinal direction of the outer end of the wing area The absorbent article according to claim 1 or 2. The compressed groove is absorbent article according to claim 3, wherein the inner compressed groove, and a-law including an outer compression groove which is disposed outside the width direction than the inner compressed groove.   The absorbent article according to claim 4, wherein at least one of the inner pressing groove and the outer pressing groove is a continuous ring.   6. At least one of the front region and the rear region, the basis weight of the absorber in the side portion in the width direction is higher than the basis weight of the absorber in the center in the width direction. The absorbent article as described in any one of these.   The basis weight of the absorber in the side portion in the width direction of at least one of the front region and the rear region is higher than the basis weight of the absorber in the side portion in the width direction of the wing region. Item 6. The absorbent article according to any one of Items 1 to 5.   The absorbent article according to any one of claims 1 to 7, wherein a plurality of point-like compressed parts are formed in the front region and the rear region.   The width in the width direction of the absorber at the center in the front-rear direction of the wing region is larger than the maximum length in the width direction of the absorber in the front region, and the width of the absorber in the rear region in the width direction. Greater than the maximum length,
  The absorbent article according to any one of claims 1 to 8, wherein an outer edge of the absorbent body in the wing region is located on an inner side in the width direction than a root of the wing region.

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