JP7071809B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article such as a menstrual napkin, a panty liner, an incontinence pad, etc., and more particularly to an absorbent article in which the rear end portion is formed so as to be bendable and deformable toward the skin side during use.

Conventionally, as the absorbent article, cotton-like pulp or the like is used between a liquid-permeable back sheet made of a polyethylene sheet or a polyethylene sheet laminated non-woven fabric or the like and a liquid-permeable front sheet made of a non-woven fabric or a perforated plastic sheet or the like. It is known that an absorber consisting of a non-woven fabric is interposed.

Various improvements have been made to this type of absorbent article in order to prevent leakage of body fluids and the like. For example, in the following Patent Document 1, the excretion part flexible shaft located on the center line extending in the vertical direction and extending over the excretion part facing portion, and the excretion part flexible shaft located on the center line extending in the vertical direction. It is an absorbent article having an anterior flexible shaft extending toward the front portion and a rear flexible shaft extending toward the rear portion of the excretory portion flexible shaft located on the center line extending in the vertical direction, and is taken out from the packaging material. When placed under non-stress, the excretory part is flexed convexly toward the front sheet side at the flexible shaft, and is flexed convexly toward the back surface sheet at the front flexible shaft and the rear flexible shaft. Absorbable articles are disclosed.

Further, in Patent Document 2 below, a first flexible shaft and a second flexible shaft are provided on the central long shaft portion in the longitudinal direction and the central short shaft portion in the width direction of the absorbent article, respectively. The flexible shaft is formed so that the absorbent article can be easily bent in a convex shape toward the surface material on the first flexible shaft at the rear portion of the second flexible shaft, and the second flexible shaft is flexible. In the portion in front of the flexible shaft, the absorbent article is formed so as to be easily bent in a concave shape toward the surface material on the first flexible shaft, and the second flexible shaft is formed of the absorbent article. An absorbent article is disclosed in which the second flexible shaft is formed so as to be easily bent in a concave shape on the surface material side.

Japanese Unexamined Patent Publication No. 2017-108869 Japanese Unexamined Patent Publication No. 4-341261

The absorbent articles described in Patent Documents 1 and 2 are intended to fit the body by bending the absorbent articles with a predetermined flexible shaft to reduce leakage, but the edge portion of the absorbent articles is used. The fit was not considered, and when the edge of the absorbent article did not fit the body, there was a problem that the body fluid leaked and the wearing feeling was deteriorated. In particular, if the rear end of the absorbent article does not fit the buttocks, a gap will be created between the absorbent article and the body when moving the legs, such as when exercising or climbing stairs. There was a risk of leakage. In order to prevent such leaks, the user always had to feel a sense of discomfort when using a large absorbent article or an unfamiliar tampon. In addition, when an absorbent article that does not fit the body is used, it tends to rub against the skin, which causes skin troubles such as itching.

Therefore, a main object of the present invention is to provide an absorbent article that follows the movement of the body and fits the body to prevent leakage and improve the wearing feeling.

In order to solve the above problems, as the present invention according to claim 1, an absorber is interposed between the liquid permeable front sheet and the back surface sheet, and an outer peripheral flap in which no absorber is present around the absorber. In an absorbent article in which a portion is formed,
At the rear end of the absorbent article, perforations extending in the width direction to the inward side are provided at a plurality of places, and the outer surface of the back surface sheet on at least one of the left and right sides of the perforations . Is provided with a joining portion for overlapping and joining the left and right ends divided by the perforations when the absorbent article is used.
An absorbent article is provided in which the absorber is provided on the front side of the perforation , and the perforation is formed on an outer peripheral flap portion that does not reach the absorber.

In the invention according to claim 1, when the absorbent article is used, the left and right ends divided by the perforations are overlapped with each other and joined at the joint, so that the rear end portion of the absorbent article is skinned. It can be installed in a state of being bent and deformed toward the side. As a result, the rear end portion of the absorbent article has a three-dimensional shape that fits the shape of the buttocks, so that it becomes easier to follow the movement of the legs and the like, and the leakage of body fluid can be prevented. In addition, since the rear end portion of the absorbent article fits the body, the wearing feeling is improved.

The absorber is provided in a region in front of the perforation , and the perforation is formed in an outer peripheral flap portion that does not reach the absorber. Therefore, the rear end portion of the absorbent article provided with the perforation is likely to be bent and deformed toward the skin side, and the fit to the buttocks is improved.

By providing the perforations at a plurality of locations separated from each other in the width direction at the rear end of the absorbent article, any perforation among the plurality of perforations can be bent and deformed into a predetermined shape during use. The degree of bending and deformation of the rear end portion of the absorbent article can be changed stepwise.

According to the second aspect of the present invention, when the left and right ends divided by the perforations are overlapped with each other and joined at the joint, the rear end of the absorbent article is bent and deformed. The absorbent article according to claim 1 , wherein an embossed groove recessed on the non-skin side is provided on the skin contact surface of the liquid permeable surface sheet along the portion.

In the invention according to claim 2 , the non-skin contact surface with the skin contact surface of the liquid permeable surface sheet is along the base end portion where the rear end portion of the absorbent article is bent and deformed when the absorbent article is used. Since the embossed groove recessed on the side is provided, the rear end portion of the absorbent article is easily bent and deformed by using the embossed groove as a flexible shaft, and the fit can be further improved.

According to the third aspect of the present invention, the embossed groove is provided in each of the left side region and the right side region with the longitudinal center line of the absorbent article as a boundary, or is continuously extended over the left side region and the right side region. The absorbent article according to claim 2 provided is provided.

In the invention according to claim 3 , when the embossed groove is provided in each of the left and right regions, the embossed groove provided in each region can cope with different deformations and movements in each of the left and right regions. Therefore, the fit of the absorbent article can be further improved. On the other hand, when the embossed groove is continuously provided over the left side region and the right side region, the rear end portion of the absorbent article is more easily bent and deformed, and the bent and deformed state can be maintained. ..

As described in detail above, according to the present invention, by following the movement of the body and fitting the body, leakage can be prevented and the wearing feeling is improved.

It is a partially broken development view of the menstrual pad 1 which concerns on this invention. FIG. 1 is a view taken along the line II-II of FIG. It is a back view of the menstrual pad 1. It is a perspective view which shows the use state of the menstrual napkin 1. It is a development view (No. 1) of the menstrual pad 1 which concerns on a modification. It is a development view (No. 2) of the menstrual pad 1 which concerns on a modification. (A) and (B) are development views (No. 3) of the menstrual napkin 1 according to the modified example. (A) and (B) are development views (No. 4) of the menstrual napkin 1 according to the modified example. It is a back view of the menstrual pad 1 which concerns on a modification. (A) and (B) are development views (No. 5) of the menstrual napkin 1 according to the modified example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic configuration of menstrual napkin 1]
As shown in FIGS. 1 and 2, the menstrual napkin 1 according to the present invention has an impermeable back sheet 2 made of a polyethylene sheet, a polypropylene sheet, or the like, and a permeation that rapidly permeates menstrual blood, a cage, or the like. An absorber 4 composed of a liquid surface sheet 3, cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3, and the absorber 4 for maintaining the shape and improving diffusivity of the absorber 4. It is composed of an encapsulating sheet 5 made of crepe paper or a non-woven fabric that surrounds the surface, and side sheets 7 and 7 arranged along the longitudinal direction on both sides of the skin contact surface side, respectively. Further, around the absorber 4, at the front and rear edge portions in the longitudinal direction of the napkin, the outer edge portions of the impermeable back sheet 2 and the liquid permeable surface sheet 3 are adhesives such as hot melt or heat seal. The impermeable back sheet 2 and the side sheet 7 that are joined by a joining means such as an ultrasonic seal and extend laterally from the side edges of the absorber 4 at both side edges thereof are hot melted. It is joined by an adhesive such as, heat seal, ultrasonic seal, or the like, and an outer peripheral flap portion in which the absorber 4 does not exist is formed on the outer periphery.

Hereinafter, the structure of the menstrual napkin 1 will be described in more detail.
As the impermeable back sheet 2, a sheet material having at least water impermeability such as an olefin resin sheet such as polyethylene or polypropylene is used, but in addition to this, a laminated non-woven fabric in which a non-woven fabric is laminated on a polyethylene sheet or the like, and further A non-woven fabric sheet (in this case, the waterproof film and the non-woven fabric form an impermeable back sheet) can be used after substantially ensuring the impermeable property by interposing a waterproof film. In recent years, from the viewpoint of preventing stuffiness, those having moisture permeability have tended to be used. This water-impervious / moisture-permeable sheet material is a microporous sheet obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching it in a uniaxial or biaxial direction. Is.

Next, as the liquid-permeable surface sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. The material fibers constituting the non-woven fabric can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A non-woven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a melt blown method, or a needle punching method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and has high compression stability. When a large number of through holes are formed in the liquid-permeable surface sheet 3, the body fluid is quickly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but it is preferable to use short fibers in order to give the texture of the towel cloth. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Further, a core-sheath type fiber having a high melting point fiber as a core and a low melting point fiber as a sheath, a side-by-side type fiber, and a composite fiber of a split type fiber can also be preferably used.

In this menstrual napkin 1, as will be described in detail later, when using the sanitary napkin 1, the left and right ends divided by the notch 10 are overlapped with each other, and the outer surface of the impermeable back sheet 2 on one side is overlapped. In order to join the joint portion 11 provided in the above to the liquid-permeable surface sheet 3 on the other side, the joint portion 11 can be easily joined to the liquid-permeable surface sheet 3 as the liquid-permeable surface sheet 3. It is preferable to use one having less fluff on the surface. Specifically, it is preferable to use a non-woven fabric obtained by a spunbond method or a thermal bond method, a porous plastic sheet, or the like.

The absorber 4 interposed between the impermeable back sheet 2 and the liquid permeable front sheet 3 is, for example, a pulp in which a highly water-absorbent resin is mixed, or a pulp in which chemical fibers are mixed. , A mixture of highly absorbent resin is used. As shown in the figure, the absorber 4 is made of an encapsulated sheet 5 made of crepe paper, non-woven fabric, or the like in order to maintain its shape, quickly diffuse menstrual blood, etc., and prevent reversion of menstrual blood, etc. once absorbed. It is surrounded. Examples of the pulp include cellulose fibers such as chemical pulp and molten pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. Further, as the absorber 4, an air-laid absorber capable of reducing the bulk or a polymer sheet in which a highly water-absorbent resin is arranged between two layers of a non-woven fabric may be used.

Further, synthetic fibers may be mixed with the absorber 4. As the synthetic fiber, for example, polyolefin-based fibers such as polyethylene or polypropylene, polyester-based fibers such as polyethylene terephthalate and polybutylene terephthalate, polyamide-based fibers such as nylon, and copolymers thereof can be used, and these two types can be used. It may be a mixture. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilic agent so as to have an affinity for body fluids.

Examples of the highly water-absorbent resin include a crosslinked product of polyacrylic acid salt, a self-crosslinked polyacrylic acid salt, a saponified product of an acrylic acid ester-vinyl acetate copolymer crosslinked product, and a crosslinked product of isobutylene / maleic anhydride copolymer. Examples thereof include cross-linked polysulfonates and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Of these, acrylic acid or acrylate-based ones, which are excellent in water absorption amount and water absorption rate, are suitable. In the manufacturing process, the highly water-absorbent resin having the water-absorbing performance can adjust the water-absorbing power and the water-absorbing rate by adjusting the cross-linking density and the cross-linking density gradient.

As the encapsulating sheet 5 surrounding the absorber 4, crepe paper such as tissue paper or tissue paper or a non-woven fabric can be used. The fiber material constituting the crepe paper is preferably made of 100% pulp fiber, and is preferably softwood pulp and broadleaf pulp used for thin paper and tissue paper. For the hydrophilicity, spunbonded non-woven fabric and SMS non-woven fabric (SMS, SMSMS, etc.) are suitable, and polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material thereof. When the encapsulating sheet 5 surrounding the absorber 4 is provided as in this example, as a result, the encapsulating sheet 5 is interposed between the liquid-permeable surface sheet 3 and the absorber 4. The encapsulated sheet 5 having excellent absorbability rapidly diffuses the body fluid and prevents reversion of menstrual blood and the like.

On the other hand, side sheets 7 and 7 are provided on both sides of the menstrual pad 1 on the skin contact surface side along the longitudinal direction and over almost the entire length of the napkin 1, respectively. Wing-shaped flaps W, W protruding outward on both sides of the main body portion are formed on both sides of the main body portion by a part of the impermeable back sheet 2 which is partially extended laterally and also extended laterally. It is formed. The wing-shaped flaps W and W are used by being folded outward at the folding line RL (FIG. 1) at the base end so as to wrap the crotch portion of the underwear when mounted, and the wing-shaped flap W is used by folding it outward. The purpose is to prevent slippage with the underwear by attaching the slip-preventing adhesive layer 9 (FIG. 3) provided on the outer surface of the sheet 2 to the outer surface of the underwear.

As the side sheet 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if you place importance on functions such as preventing menstrual blood and vaginal discharge from penetrating, or enhancing the feel of the skin, water repellent treatment coated with silicone-based, paraffin-based, alkylchromic chloride-based water repellent, etc. It is desirable to use non-woven fabric. Further, if the absorbability of menstrual blood and the like in the wing-shaped flaps W and W is emphasized, a method of coexisting and polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol in the process of producing synthetic fibers, or , Treat with a metal salt such as stannic chloride, partially dissolve the surface to make it porous, and make the synthetic fiber swell or porous by a method such as depositing metal hydroxide, and apply the capillary phenomenon to make it hydrophilic. It is desirable to use the hydrophilically treated non-woven fabric given the above. One or a plurality of thread-like elastic elastic members (not shown) having the inner side portion of the side sheet 7 folded substantially in double and fixed at appropriate positions at both ends or in the longitudinal direction inside the double sheet. By arranging the menstrual napkin 1 along the longitudinal direction, as shown in FIG. 4, the menstrual napkin 1 is concave toward the skin contact surface side along the longitudinal direction under no load (natural state). It may be formed so as to be curved.

As shown in FIG. 3, the non-skin contact surface (impermeable back sheet 2) of the main body portion in which the absorber 4 is interposed between the liquid permeable front sheet 3 and the impermeable back sheet 2. On the outer surface side), a plurality of strips, in the illustrated example, three strips of the main body slip-preventing adhesive layers 8, 8 ... Are formed by an appropriate coating pattern for fixing to the underwear. Further, a wing slip prevention pressure-sensitive adhesive layer 9 is formed on the surface of the wing-shaped flaps W and W on the impermeable back sheet 2 side. The main body slip prevention pressure-sensitive adhesive layer 8 and the wing slip prevention pressure-sensitive adhesive layer 9 are covered with a release material until the sanitary napkin 1 is used.

As the pressure-sensitive adhesive forming the slip-preventing pressure-sensitive adhesive layers 8 and 9, for example, one containing any one of a styrene-based polymer, a pressure-sensitive adhesive, and a plasticizer as a main component is preferably used. Examples of the styrene-based polymer include styrene-ethylene-butylene-styrene block copolymer, styrene-butylene-styrene block copolymer, styrene-isobutylene-styrene copolymer and the like, but only one of them is used. It may be used or it may be a blend of two or more polymers. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable because it has good thermal stability. Further, as the tackifier and the plasticizer, those solid at room temperature can be preferably used, and as the tackifier, for example, C5 type petroleum resin, C9 type petroleum resin, dicyclopentadiene type petroleum resin, rosin type petroleum resin can be used. , Polyterpene resin, terpenephenol resin and the like, and examples of the plasticizer include monomer plasticizers such as triflesyl phosphate, dibutyl phthalate and dioctyl phthalate, as well as polymer plasticizers such as vinyl polymers and polyesters. Be done.

Further, as a method of applying the adhesive, a well-known application method (for example, spray application or blade coating) such as a contact type slot method, a non-contact spiral method, an omega method, a beat method, a curtain method and the like is used. Etc.) can be adopted.

[Structure of the rear end of menstrual napkin 1]
Next, the structure of the rear end portion, which is a characteristic part of the present menstrual napkin 1, will be described. As shown in FIGS. 1 and 3, the menstrual napkin 1 is provided with a notch 10 extending from the rear end to the inward side of the menstrual napkin 1, and at least one of the left and right sides of the notch 10 is not. A joint portion 11 is provided on the outer surface (non-skin contact surface) of the liquid-permeable back surface sheet 2 for overlapping and joining the left and right ends divided by the notch 10 when the sanitary napkin 1 is used. Has been done. The notch 10 extends from the posterior end edge of the menstrual napkin 1 toward the front side of the menstrual napkin 1 along substantially the longitudinal direction of the menstrual napkin 1, and the rear end portion of the menstrual napkin 1 is the above. It is separated to the left and right with the notch 10 as the boundary.

When using the sanitary napkin 1, as shown in FIG. 4, the left and right ends divided by the notch 10 are overlapped with each other and provided on the outer surface of the impermeable back sheet 2 on one side. By joining the joint portion 11 to the outer surface (skin contact surface) of the liquid-permeable surface sheet 3 on the other side, the rear end portion of the sanitary napkin 1 is attached in a bent and deformed state toward the skin side. ..

As a result, the rear end of the menstrual napkin 1 has a three-dimensional shape that fits the shape of the buttocks. The properties are improved and the leakage of body fluid can be prevented. Further, since the rear end portion of the menstrual napkin 1 fits the body, the wearing feeling is improved.

Further, as shown in FIG. 4, since the rear end portion of the sanitary napkin 1 is bent and deformed toward the skin side in the form of the bow of a ship, the body fluid flowing from the front side to the rear side is bent and deformed. It is folded back like a wave by the deformed part, so that leakage from the rear end can be reliably prevented.

The notch 10 is a linear cut portion cut by a cutter or the like, and is arranged so that the left and right end edges separated by the cut portion substantially face each other. In the present menstrual napkin 1, instead of the notch 10, as shown in FIG. 5, a form of forming the notch 12 can be adopted. The notch 12 is a portion cut out in a substantially V shape, and the left and right edge edges separated by the notch portion are arranged so as to be separated from each other in a substantially V shape. Further, as shown in FIG. 6, a perforation 13 for forming the notch or a notch (notch in the illustrated example) is formed, and the user cuts off the perforation 13 and cuts the notch 10 or A form of forming the notch 12 can also be adopted.

The notch 10 can be formed at any position as long as it is the posterior edge of the menstrual napkin 1. However, when using the sanitary napkin 1, the ends of the notch 10 overlapped on the skin contact surface side in a state where the left and right ends divided by the notch 10 are overlapped and joined at the joint portion 11. Is not preferable if it is located on the longitudinal center line CL of the menstrual napkin 1 because the body fluid that has flowed to the rear side through the buttock groove is more likely to leak to the outside through the gap of the notch 10. ..

Therefore, the notch 10 is provided along the longitudinal direction of the menstrual napkin 1 on the longitudinal center line CL of the menstrual napkin 1 as shown in FIG. 1, or is provided for menstruation as shown in FIG. It is preferable to form the napkin 1 at a position deviated in the width direction.

When the notch 10 is provided on the longitudinal center line CL, the skin contact surface is in a state where the left and right ends divided by the notch 10 are overlapped and joined at the joint portion 11 when used. Since the end portion of the notch 10 overlapped on the side is always arranged at a position inclined with respect to the buttock groove, the body fluid flowing along the buttock groove can be received by a portion other than the notch 10. It becomes possible to prevent the body fluid from leaking to the outside through the gap of the notch 10.

Similarly, when the notch 10 is provided at a position deviated in the width direction of the sanitary napkin 1, the left and right ends divided by the notch 10 are overlapped with each other and joined at the joint portion 11 during use. In this state, the end of the notch 10 overlapped on the skin contact surface side is formed at a position different from the direction in which the buttock groove extends. It can be received at the portion, and it becomes possible to prevent the body fluid from leaking to the outside through the gap of the notch 10. The above-mentioned position deviated in the width direction is a position deviated from the longitudinal center line CL in the width direction of the sanitary napkin 1, and as shown in FIG. 7 (A), the rear end of the notch 10. When the portion is provided at a position deviating from the longitudinal center line CL and the front end portion of the notch 10 is provided on the longitudinal center line CL, or as shown in FIG. 7B, after the notch 10. This includes the case where the side end portion and the front end portion are provided at positions deviating from the longitudinal center line CL.

As shown in FIG. 1, the absorber 4 can be provided in front of the notch 10. That is, the notch 10 is provided in a range that does not reach the absorber 4. As a result, when using the sanitary napkin 1, the rear end portion of the sanitary napkin 1 faces the skin side in a state where the left and right ends divided by the notch 10 are overlapped and joined at the joint portion 11. It becomes easy to bend and deform, and the fit to the buttocks is improved. Further, since the notch 10 is provided in a range that does not reach the absorber 4, the notch 10 does not affect the absorption performance of the menstrual napkin 1, and the original absorption performance of the menstrual napkin 1 can be maintained. Further, when the front end portion of the notch 10 is positioned in the vicinity of the rear end portion of the absorber 4, the rear end portion of the sanitary napkin 1 is formed with the rear end edge of the absorber 4 as the base end. It becomes easy to bend and deform toward the skin side, and it becomes possible to further improve the fit with the body. The separation distance (shortest distance) between the front end portion of the notch 10 and the rear end portion of the absorber 4 is preferably about 1 to 5 mm, preferably about 1 to 3 mm.

On the other hand, the absorber 4 may extend to both side portions of the notch 10, as shown in FIG. As a result, when using the sanitary napkin 1, the absorber 4 is bent and deformed along the shape of the buttocks by overlapping the left and right ends divided by the notch 10 and joining them at the joint portion 11. Will intervene, and the absorption capacity of the menstrual napkin 1 can be improved. As shown in FIG. 8A, the absorber 4 may be formed in an integrated form in which the main body portion 4A including the body fluid draining portion of the user and the side portions 4B of the notch 10 are continuous. , As shown in FIG. 8B, the main body portion 4A and the both side portions 4B of the notch 10 may be formed as separate bodies. When formed as a separate body, the flexible shaft is formed between the main body portion 4A and both side portions 4B of the notch 10, and the rear end portion of the menstrual napkin 1 is easily bent and deformed toward the skin side. , Which is the preferred form.

The length of the notch 10 is preferably 10 to 50 mm, preferably 25 to 30 mm. As shown in FIG. 5, the separation width c of the rear end portion of the notch 12 is preferably 5 to 15 mm.

In the above embodiment, the notch 10 is provided at only one place at the rear end portion of the menstrual napkin 1, but the notch 10 is provided at a plurality of places separated in the width direction at the rear end portion of the menstrual napkin 1. You may. Thereby, when the sanitary napkin 1 is used, the degree to which the rear end portion of the sanitary napkin 1 is flexed and deformed by bending and deforming any of the notches 10 among the plurality of notches 10, 10 ... You will be able to change it step by step. In this case, since there is a notch portion that is not bent and deformed depending on the method of use, it is preferable that the notch 10 is formed by the perforation 13.

The joint portion 11 is provided on the outer surface (non-skin contact surface) of the impermeable back sheet 2 on at least one of the left and right sides of the notch 10, and is divided into left and right by the notch 10 during use. It is joined to the outer surface (skin contact surface) of the liquid-permeable surface sheet 3 at the end of the notch 10 on the opposite side in a state where the ends of the two are overlapped with each other.

As the joint portion 11, the pressure-sensitive adhesive constituting the slip-preventing pressure-sensitive adhesive layers 8 and 9 can be similarly used. The joint portion 11 is covered with a release material together with the slip prevention pressure-sensitive adhesive layers 8 and 9 until the sanitary napkin 1 is used.

The planar shape of the joint portion 11 can be formed into an appropriate shape such as a rectangle, a square, a triangle, or a circle as long as the left and right ends divided by the notch 10 can be held in a state of being overlapped with each other. Particularly preferably, as shown in FIG. 9, it is preferable to form a triangular shape that gradually widens from the front end portion to the rear end portion of the notch 10 along the notch 10. As a result, with the front end of the notch 10 as the base point, the left and right ends divided by the notch 10 are overlapped and joined by the joining portion 11 over almost the entire surface, so that the joining strength is improved. At the same time, by overlapping the left and right ends according to the size of the joint portion 11, the rear end portion of the sanitary napkin 1 is flexed and deformed at an optimum angle to fit the shape of the buttocks. Will be able to. When the joint portion 11 is formed in a triangular shape, as shown in FIG. 9, the length a of the side along the notch 10 and the side extending in the substantially width direction of the sanitary napkin 1 from the rear end portion of the notch 10. The ratio a / b to the length b is preferably 1 to 3, preferably 1.5 to 2.5.

In the above embodiment, the joint portion 11 is provided only on one side of the notch 10, but the joint portion 11 may be provided on both the left and right sides of the notch 10. As a result, the joint portion 11 on one side can be used for joining when the left and right ends are overlapped with each other, and the joint portion 11 on the other side can be used as a slip stopper for underwear. Further, by providing the joints 11 on the left and right sides of the notch 10, the joints 11 can be overlapped in any direction, and the assembly work of the sanitary napkin 1 at the time of use becomes easy.

As shown in FIG. 1, when the sanitary napkin 1 is attached, when the left and right ends divided by the notch 10 are overlapped and joined at the joint portion 11, the rear end of the sanitary napkin 1 is joined. It is preferable to provide an embossed groove 14 recessed on the non-skin side on the skin contact surface of the liquid-permeable surface sheet 3 along the base end where the portion is bent and deformed. As a result, the rear end portion of the sanitary napkin 1 is easily bent and deformed with the embossed groove 14 as the flexible shaft, and the fit can be improved more reliably.

The embossed groove 14 is formed so that the rear end portion of the sanitary napkin 1 is formed substantially along the base end to be bent and deformed, passes through the front end portion of the notch 10 or the front side thereof, and is the posterior end edge of the absorber 4. It is formed at a position that passes through or in the vicinity thereof. The embossed groove 14 is preferably formed at a position passing between the absorber 4 and the notch 10, but a part or all of the embossed groove 14 may overlap with the absorber 4.

The embossed groove 14 is formed by pressing at least the liquid-permeable surface sheet 3 from the skin contact surface side in the thickness direction. When the absorber 4 extends to both side portions of the notch 10, the embossed groove 14 may be formed by integrally pressing the liquid permeable surface sheet 3 and the absorber 4. good.

As shown in FIG. 1, one embossed groove 14 can be provided in each of the left side region and the right side region with the longitudinal center line CL of the menstrual napkin 1 as a boundary. As a result, it becomes possible to cope with different deformations and movements in the left and right regions, and the fit can be further improved. The separation width between the left and right embossed grooves 14, 14 is preferably 0 to 10 mm.

As shown in FIG. 10, the embossed groove 14 may be continuously provided over the left side region and the right side region of the longitudinal center line CL of the menstrual napkin 1. As a result, the rear end portion of the menstrual napkin 1 is more easily bent and deformed, and the bent and deformed state can be maintained. The embossed groove 14 is preferably formed through or in front of the front end of the notch 10, and is formed between the front end of the notch 10 and the rear end of the absorber 4. Is more preferable. As a result, the rear end portion of the menstrual napkin 1 is easily bent and deformed with the embossed groove 14 as the base end.

The embossed groove 14 can be formed in an appropriate form such as a straight line, a curved line, a polygonal line, or a wavy line. Further, a continuous line may be used, or a discontinuous line in which embossed portions and non-embossed portions are alternately arranged may be used.

As shown in FIG. 1 and the like, the embossed groove 14 preferably has both ends in the width direction of the menstrual napkin 1 extending to the side sheet 7. As a result, the side sheets 7 can be reliably bent and deformed up to the laminated portion.

The groove width of the embossed groove 14 is preferably 1.0 to 2.0 mm. If the groove width is too small, it is difficult for the rear end portion of the menstrual napkin 1 to become a base end that bends and deforms, and if the groove width is too large, it becomes hard and a feeling of strangeness occurs when wearing.

As shown in FIG. 8A, in the embodiment in which the absorber 4 is extended to both side portions of the notch 10, the embossed groove 14 is the absorber extending to both sides of the notch 10. It is preferable to arrange the base end portion of the extending portion 4B so as to substantially cross the width direction of the menstrual napkin 1. As a result, the extending portion 4B of the absorber is easily bent and deformed at the base end portion with the embossed groove 14 as the flexible shaft.

In the sanitary napkin 1 in which the perforation 13 for forming the notch 10 or the notch 12 is formed instead of the notch 10, the user makes the perforation 13 at the time of use when he / she is worried about leakage due to vigorous exercise or the like. It can be used by separating it to form a notch 10 or a notch 12 and bending and deforming it into a predetermined shape. There are two ways to use it.

As shown in FIG. 3, among the main body slip-preventing adhesive layers 8, 8 ... Formed on the outer surface of the impermeable back sheet 2, the positions where the notch 10 and the sanitary napkin 1 do not overlap in the longitudinal direction. The main body slip-preventing adhesive layer 8 (in the illustrated example, of the three main body slip-preventing adhesive layers 8, 8 ..., The main body slip-preventing adhesive layers 8 and 8 on both sides) is a menstrual napkin 1. It is preferable that the menstrual napkin 1 is formed so as to extend to the rear end portion of the menstrual napkin 1 which is flexed and deformed toward the skin when used. As a result, it can be continuously fixed to the underwear from the main body portion to the rear end portion of the menstrual napkin 1 bent and deformed toward the skin side, and the state of being fitted to the buttocks can be reliably maintained.

In the method for manufacturing the menstrual napkin 1 provided with the notch 10, after the menstrual napkin 1 is manufactured by a usual method, the notch 10 is constructed at the rear end portion using a known cutting means such as a die cutter.

1 ... sanitary napkin, 2 ... impermeable back sheet, 3 ... liquid permeable front sheet, 4 ... absorber, 5 ... encapsulating sheet, 7 ... side non-woven fabric, 10 ... notch, 11 ... joint, 12 ... Notch, 13 ... Perforation, 14 ... Embossed groove

Claims (3)

In an absorbent article in which an absorber is interposed between the liquid-permeable front surface sheet and the back surface sheet, and an outer peripheral flap portion in which the absorber does not exist is formed around the absorber.
At the rear end of the absorbent article, perforations extending in the width direction to the inward side are provided at a plurality of places, and the outer surface of the back surface sheet on at least one of the left and right sides of the perforations . Is provided with a joining portion for overlapping and joining the left and right ends divided by the perforations when the absorbent article is used.
An absorbent article characterized in that the absorber is provided on the front side of the perforation , and the perforation is formed on an outer peripheral flap portion that does not reach the absorber. The liquid permeability along the base end portion where the rear end portion of the absorbent article bends and deforms when the left and right ends divided by the perforation are overlapped with each other and joined at the joint portion. The absorbent article according to claim 1 , wherein the skin contact surface of the surface sheet is provided with an embossed groove recessed on the non-skin side. The second aspect of claim 2 , wherein the embossed groove is provided in each of the left side region and the right side region with the longitudinal center line of the absorbent article as a boundary, or is continuously provided over the left side region and the right side region. Absorbent article.

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