JP2016154634A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent body fluid before absorbed by an absorber from diffusing between sheets and leaking outside.SOLUTION: In a sanitary napkin 1, an absorber 4 is interposed between a liquid-permeable surface sheet 3 and a rear surface sheet 2, and a second sheet 6 with a hydrophilic property is disposed between the liquid-permeable surface sheet 3 and the absorber 4. First adhesive layers 20 applying adhesive into planar shapes are formed between the liquid-permeable surface sheet 3 and the second sheet 6 at width direction both side parts of an area corresponding to a blood discharge port part H, along the longitudinal direction; and second adhesive layers 21 applying adhesive into planar shapes are formed between the second sheet 6 and the absorber 4 in longer areas in the longitudinal direction than the first adhesive layers 20 outside in the width direction of the first adhesive layers 20, along the longitudinal direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners and incontinence pads for absorbing menstrual blood and vaginal discharge, and more specifically, in order to prevent leakage of bodily fluids, an adhesive is applied to a predetermined area in a planar shape. The present invention relates to an absorbent article provided with an applied adhesive layer.

  Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.

  Many improvements have been made to this type of absorbent article, and various measures for preventing leakage of body fluids have been taken. As such bodily fluid leakage prevention means, a structure in which a three-dimensional gather projecting to the skin side along the longitudinal direction is formed on both sides on the skin contact surface side (for example, Patent Document 1 below), and a liquid-permeable surface sheet is formed on the absorber. Known is an embossed groove formed by squeezing from the surface side of the liquid-permeable surface sheet in a coated state (for example, Patent Document 2 below).

Japanese Patent Laid-Open No. 11-19120 JP 2002-119540 A

  In the case where the three-dimensional gather is formed, the body fluid blocked by the three-dimensional gather can permeate the liquid-permeable surface sheet and can be absorbed by the absorber, but this blocked body fluid is absorbed by the absorber. In the process, the liquid-permeable surface sheet and the absorbent body are accumulated, and there is a risk of diffusing between these layers and leaking outside.

  Further, in the case where the embossed groove is formed, the body fluid flowing on the surface of the liquid-permeable surface sheet flows into the embossed groove, so that the body fluid is surely absorbed by the absorber and the body fluid flows outside the embossed groove. However, when a large amount of body fluid is discharged, the body fluid overflowing from the embossed groove may flow outside the embossed groove and cause leakage.

  In particular, the liquid permeable surface sheet disposed between the absorbent body and the hydrophilic second sheet provided between the liquid permeable surface sheet and the absorbent body has a high body fluid absorption speed. Passes quickly through the sheet, but the absorption speed of the absorber is slower than the absorption speed of the liquid-permeable surface sheet or second sheet, so the body fluid that reaches the surface of the absorber is absorbed by the absorber before the absorber and the second sheet. It has been a problem that the body fluid accumulated between these sheets is diffused to the outside and leakage occurs.

  Then, the main subject of this invention is providing the absorbent article which prevented the bodily fluid before being absorbed by an absorber from diffusing between sheets and leaking outside.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and an intermediate between the liquid-permeable top sheet and the absorbent body. In the absorbent article in which the sheet is disposed,
A first adhesive layer in which an adhesive is applied in a planar shape is formed along the longitudinal direction on both sides in the width direction of the region corresponding to the body fluid discharge site between the liquid-permeable surface sheet and the intermediate sheet. In addition, the adhesive is faced along the longitudinal direction in a region outside the first adhesive layer between the intermediate sheet and the absorbent body in the width direction and longer in the longitudinal direction than the first adhesive layer. There is provided an absorbent article characterized in that a second adhesive layer applied in a shape is formed.

  In the first aspect of the present invention, the first adhesive layer is formed along the longitudinal direction on both sides in the width direction of the region corresponding to the body fluid discharge site between the liquid-permeable surface sheet and the intermediate sheet. Therefore, the body fluid that diffuses between the liquid-permeable surface sheet and the intermediate sheet is blocked by the first adhesive layer and penetrates to the lower layer side (absorber side).

  Moreover, in this absorbent article, since the 2nd adhesive bond layer is formed in the predetermined area | region between an intermediate sheet and an absorber, the bodily fluid which diffuses between an intermediate sheet and an absorber is also said 2nd adhesive agent. It is dammed by the layer and penetrates to the lower layer side (absorber side). In addition, the second adhesive layer is formed in a region outside in the width direction from the first adhesive layer between the liquid-permeable surface sheet and the intermediate sheet and longer in the longitudinal direction than the first adhesive layer. Therefore, even if the bodily fluid dammed up by the first adhesive layer penetrates the intermediate sheet and diffuses between the intermediate sheet and the absorbent body, the dammed material is reliably dammed up by the second adhesive layer. To be able to.

  Furthermore, the first adhesive layer and the second adhesive layer are formed by applying an adhesive in a planar shape. That is, the entire surface of the adhesive layer serves as an adhesive application part, and the application part and the non-application part are not provided in a mixed manner. For this reason, the body fluid does not enter the non-applied portion and diffuse beyond the adhesive layer, and the body fluid can be reliably dammed by the adhesive layer.

  Thus, in the present absorbent article, the body fluid that diffuses between the sheets outward in the width direction is dammed over the two stages of the first adhesive layer and the second adhesive layer. The side leakage before the body fluid diffuses between the sheets and leaks to the outside in the width direction of the absorbent article can be reliably prevented.

  According to a second aspect of the present invention, there is provided a third method in which an adhesive is applied in a planar shape along the width direction at both longitudinal ends of the absorbent article between the liquid-permeable surface sheet and the intermediate sheet. An absorbent article according to claim 1, wherein an adhesive layer is formed.

  In the second aspect of the present invention, the third adhesive in which the adhesive is applied in the form of a sheet along the width direction at both longitudinal ends of the absorbent article between the liquid-permeable surface sheet and the intermediate sheet. Since the layers are formed, it is possible to prevent the body fluid from leaking before and after the body fluid diffuses in the longitudinal direction between the liquid-permeable surface sheet and the intermediate sheet and leaks outward from the front and rear end portions.

  As the present invention according to claim 3, there is provided the absorbent article according to any one of claims 1 and 2, wherein each of the adhesive layers is formed by contact-type slot coating.

  In the invention of claim 3, since the first adhesive layer, the second adhesive layer, and the third adhesive layer are formed by contact-type slot coating, they are applied in a non-contact manner. The peripheral edge of the adhesive layer becomes clearer than that, and the effect of blocking body fluid is improved.

  As the present invention according to claim 4, the absorbent article according to any one of claims 1 to 3, wherein the second adhesive layer is formed with a length of 70% or more with respect to the longitudinal dimension of the absorbent article. Provided.

  In the invention of claim 4, the second adhesive layer is formed with a length of 70% or more with respect to the longitudinal dimension of the absorbent article, so that it is sufficient for body fluid that diffuses between the intermediate sheet and the absorbent body. Therefore, it is possible to prevent side leakage more reliably.

As the present invention according to claim 5, an embossed groove is formed so as to surround a body fluid discharge site on the surface side of the liquid-permeable top sheet,
The absorbent article according to any one of claims 1 to 4, wherein each of the adhesive layers is formed outside the embossed groove.

  In the invention according to the fifth aspect, the adhesive layers are respectively formed on the outer side of the embossed grooves in order to prevent the diffusion of the body fluid that flows on the outer side of the embossed grooves.

  As the present invention according to claim 6, embossed on both sides along the longitudinal direction is formed in each region of the first adhesive layer by pressing from the surface side of the liquid-permeable surface sheet. The absorbent article in any one of -5 is provided.

  In the invention of claim 6, by forming both side embosses along the longitudinal direction by squeezing from the surface side of the liquid-permeable surface sheet, respectively, in the region of the first adhesive layer, the first A synergistic effect of body fluid damming by one adhesive layer and both-side embossing can be expected, and reversal of body fluid to the surface side when the polymer contained in the absorber compressed by the both-side embossing absorbs water can be prevented. It becomes like this.

As the present invention according to claim 7, an embossed groove is formed on the surface side of the liquid-permeable surface sheet so as to surround a body fluid discharge site,
A fourth adhesive layer in which an adhesive is applied in a planar shape along the embossed groove on either or both of the front side and the rear side of the embossed groove between the liquid-permeable surface sheet and the intermediate sheet. An absorbent article according to any one of claims 1 to 6 is provided.

  In the invention according to claim 7, the adhesive is applied in a planar shape along the embossed groove on either or both of the front and rear sides of the embossed groove formed so as to surround the body fluid discharge site. By forming the four adhesive layers, the body fluid diffused in the front-rear direction is blocked by the fourth adhesive layer, so that leakage from the front and rear end portions can be surely prevented.

  As the present invention according to claim 8, the intermediate sheet is a hydrophilic second sheet disposed between the liquid-permeable surface sheet and the absorber or an encapsulating sheet surrounding the absorber. An absorbent article according to any one of 1 to 7 is provided.

  As described above in detail, according to the present invention, it is possible to prevent body fluid before being absorbed by the absorber from diffusing between the sheets and leaking outside.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. It is the III-III arrow directional view of FIG. It is a principal part expanded sectional view of the sanitary napkin 1 which shows the flow of a bodily fluid. It is an expanded view of the sanitary napkin 1 which concerns on another form example. It is the VI-VI line arrow directional view of FIG. It is an expanded sectional view of the embossed groove 14 part on both sides. It is an expanded view of the sanitary napkin 1 which concerns on another form example. It is sectional drawing of the sanitary napkin 1 which concerns on another form example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Basic structure of sanitary napkin 1]
The sanitary napkin 1 according to the present invention, as shown in FIG. 1 to FIG. 3, is a liquid-impermeable back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc. The liquid surface sheet 3, the absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3, and the liquid-permeable surface sheet 3 and the absorbent body 4 are disposed. It is composed of a hydrophilic second sheet 6 and side nonwoven fabrics 7 and 7 disposed on both sides of the surface along the longitudinal direction. Further, around the absorbent body 4, at the front and rear edge portions in the longitudinal direction of the napkin, the outer edge portions of the liquid-impermeable back sheet 2, the liquid-permeable surface sheet 3 and the second sheet 6 are adhesives such as hot melt. The liquid-impervious back sheet 2 and the side nonwoven fabric 7 that are joined by an adhesive means such as heat seal or the like and that extend laterally from the edge of the absorbent body 4 at both side edges thereof are hot-melted. The outer periphery flap part in which the absorber 4 does not exist is formed on the outer periphery. Moreover, the embossing groove | channel 10 is formed so that the blood drainage part H may be enclosed by the embossing from the surface side (skin contact surface side) of the said liquid-permeable surface sheet 3. FIG. If necessary, an encapsulating sheet made of crepe paper, nonwoven fabric or the like surrounding the absorbent body 4 may be provided to maintain the shape of the absorbent body 4 and improve the diffusibility.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and having high compression recovery properties.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is, for example, a mixture of a superabsorbent resin in pulp or a mixture of chemical fibers in the pulp. In addition, those mixed with a superabsorbent resin are used. The absorbent body 4 can be surrounded by an encapsulating sheet in order to maintain the shape and quickly diffuse menstrual blood and the like, and to prevent reversal of once absorbed menstrual blood and the like. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and those made of 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 that can reduce the bulk may be used.

  The absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the highly water-absorbent resin is desirably 10 to 60% of the weight of the absorber. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

  When providing an encapsulating sheet that surrounds the absorbent body 4, the encapsulating sheet is consequently interposed between the liquid-permeable surface sheet 3 and the absorbent body 4, and the encapsulating sheet is excellent in absorbency. As a result, body fluid is quickly diffused and reversal of menstrual blood and the like is prevented.

  On the other hand, side nonwoven fabrics 7 and 7 are provided on both side portions on the surface side of the sanitary napkin 1 along the longitudinal direction and over almost the entire length of the napkin 1, respectively. Wing-like flaps W and W are formed by a part of the liquid-impervious back sheet 2 that extends laterally and also laterally.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic It is desirable to use a hydrophilic treated non-woven fabric provided with.

As shown in FIG. 2, the inner side of the side nonwoven fabric 7 folds the side nonwoven fabric 7 almost double, and inside the double sheet, in the middle in the height direction, as appropriate at both ends or in the longitudinal direction. One or a plurality of, in the illustrated example, two thread-like elastic elastic members 8 and 8 are disposed, and the double sheet portion is erected on the skin side by the contraction force. Is formed.
[Embossed groove 10]
As shown in FIG. 1, an embossed groove 10 is formed on the surface side of the liquid-permeable surface sheet 3 so as to surround the blood outlet H.

  The embossed grooves 10 can be provided in various plane patterns. In this example, as shown in FIG. 1, a central emboss 11 having a generally oval closed shape that is long in the longitudinal direction of the napkin so as to surround the blood discharge port H, and a front side of the central emboss 11 The front emboss 12 having a substantially inverted U shape that is spaced apart and the blood drainage port H side is spaced apart in the width direction is spaced apart from the rear side of the central emboss 11 and the blood drainage port H side is wide. It is comprised from the back side embossing 13 which makes | forms the substantially U shape separated in a direction.

  The embossing groove 10 in the illustrated example will be described in more detail. The central embossing 11 makes the region surrounded by the central embossing 11 easier to adhere to the blood drainage port of the wearer, and in the lateral direction and the front-rear direction of the body fluid. Is to prevent side leakage and front-rear leakage. The front embossing 12 and the rear embossing 13 are for receiving body fluid that has diffused to the front side or the rear side beyond the central embossing 11 to prevent leakage of body fluid to the front side or the rear side.

  The central emboss 11 is long in the longitudinal direction of the napkin in a region including at least the blood drainage port H, preferably in a longitudinal region substantially the same as or longer than the base end length of the wing-shaped flap W as shown in FIG. Are formed in an oval, oval or oval shape. The groove width of the embossed groove may be the same throughout, but the groove width of the part extending in the substantially longitudinal direction on both sides may be made smaller than the groove width of the front and rear arc-shaped parts as shown in the example of the drawing. Good.

  The front embossing 12 is formed in an arc shape that bulges to the front side of the napkin, and both end portions on the rear side are spaced apart in the width direction, and extend substantially outward in the width direction from both end portions. It is formed in a U-shaped (substantially Ω-shaped) pattern. The clearance width of the arcuate portion in the napkin width direction is formed to be approximately equal to the clearance width of the central emboss 11 in the napkin width direction, and body fluid diffused to the front side of the central emboss 11 can easily enter the front emboss 12. ing. The groove width of the front emboss 12 is formed to be substantially equal throughout.

  The rear emboss 13 is formed in an arc shape that bulges to the rear side of the napkin, and both front end portions are spaced apart in the width direction, and extend substantially outward in the width direction from both end portions. It is formed in a U-shaped (substantially inverted Ω shape) pattern. The rear embossing 13 is formed longer in the napkin longitudinal direction than the front embossing 12 in order to prevent leakage of the buttocks and the like so that body fluid can be received in a wider range in the napkin longitudinal direction. It has become. The groove width of the rear emboss 13 is also formed almost equally throughout.

The embossed groove 10 is preferably formed to a depth that compresses the absorber 4 to about 50% to 90%. The groove width (the width of the bottom surface of the embossed groove 10) is preferably about 1 mm to 5 mm.
[Adhesive layer]
In the sanitary napkin 1, as shown in FIGS. 1 and 2, the napkin is provided on both sides in the width direction of the region corresponding to the blood drainage port H between the liquid-permeable surface sheet 3 and the second sheet 6. Along the longitudinal direction, first adhesive layers 20 and 20 in which an adhesive such as hot melt is applied in a planar shape are formed, and the first adhesive layer 20 between the second sheet 6 and the absorber 4 is formed. Second adhesive layers 21, 21 in which an adhesive such as hot melt is applied in a planar shape along the longitudinal direction of the napkin in a region longer in the width direction and longer in the longitudinal direction than the first adhesive layer 20. Is formed.

  Further, as shown in FIG. 1 and FIG. 3, the adhesive was applied in a planar shape along the width direction at both ends of the napkin in the longitudinal direction between the liquid-permeable surface sheet 3 and the second sheet 6. Preferably, three adhesive layers 22 are formed.

  As a result, in the sanitary napkin 1, as shown in FIG. 4, the first adhesive layer 20 dams the body fluid that diffuses between the liquid-permeable surface sheet 3 and the second sheet 6 outward in the width direction. The body fluid thus stopped and dammed infiltrates into the lower layer side (absorber 4 side). For this reason, it is suppressed that a bodily fluid spread | diffuses to the width direction outer side from the said 1st adhesive bond layer 20, and a side leak of a bodily fluid can be prevented now.

  Further, in the sanitary napkin 1, the second adhesive layer 21 blocks the body fluid that diffuses between the second sheet 6 and the absorbent body 4 in the width direction outside, and the blocked body fluid is on the lower layer side. It penetrates into (the absorber 4 side). Moreover, since the second adhesive layer 21 is formed in a region outside the first adhesive layer 20 in the width direction and longer in the longitudinal direction than the first adhesive layer 20, the first adhesive layer It is possible to dam the body fluid that has been dammed at 20 and penetrated into the lower layer side by the second adhesive layer 21, so that side leakage of the body fluid can be reliably prevented.

  As described above, in the sanitary napkin 1, the body fluid is blocked from diffusing outside between the sheets over the two stages of the first adhesive layer 20 and the second adhesive layer 21. The body fluid before being absorbed by the body 4 can be reliably prevented from diffusing between the sheets and laterally leaking to the outside in the width direction of the sanitary napkin 1. In addition to providing the adhesive layer as a member for damming body fluid, it may be possible to arrange a film material having a water repellent function, but the raw material cost is low, the production line is not changed, and the nonwoven fabric. For example, when the adhesive layer is provided, the merit is greater because it penetrates into the layer and has a higher damming effect.

  Furthermore, in the sanitary napkin 1, the third adhesive layer 22 blocks the body fluid that diffuses outward in the longitudinal direction, and prevents longitudinal leakage from both ends in the longitudinal direction.

Hereinafter, the adhesive layer will be described in more detail.
As shown in FIGS. 1 and 2, the first adhesive layer 20 is formed between the liquid-permeable surface sheet 3 and the second sheet 6, and the liquid-permeable surface sheet 3 and the second sheet 6 are combined. It is provided for direct joining. That is, an adhesive constituting the first adhesive layer 20 is directly applied to the surface side of the second sheet 6 and the liquid-permeable surface sheet 3 is laminated on the upper surface thereof, whereby the liquid-permeable surface sheet 3 and the second sheet 6 The sheet 6 is directly joined by the first adhesive layer 20.

  As shown in FIG. 1, when a central emboss 11 surrounding the blood drainage port H is formed on the surface side of the liquid-permeable top sheet 3, diffusion of body fluid that flows beyond the central emboss 11 to the outside in the width direction In order to prevent this, it is preferable that the first adhesive layer 20 be formed in a region outside the central emboss 11 in the width direction and spaced from the side edge of the central emboss 11. Since the majority of body fluid is blocked by the central emboss 11, the adhesive layer has a role of blocking body fluid diffused beyond the central emboss 11.

  As shown in FIG. 1, the range of the first adhesive layer 20 in the longitudinal direction of the napkin is a range including at least the blood drainage port H of the wearer in the napkin width direction, preferably the blood drainage port of the wearer. It is good to form in the long range before and behind H. In FIG. 1, the first adhesive layer 20 is longer than the blood drainage port H of the wearer, and is formed with a length substantially equal to the base end length of the wing-shaped flap W. It is formed slightly shorter than the length in the direction. As a result, the body fluid diffused outward from the blood drainage port H is effectively dammed by the first adhesive layer 20.

  As shown in FIG. 1, the first adhesive layer 20 is preferably formed on the both sides of the blood drainage port H in pairs on the left and right sides. A plurality of strips may be provided apart from each other.

  Next, as shown in FIGS. 1 and 2, the second adhesive layer 21 is formed between the second sheet 6 and the absorbent body 4 to directly bond the second sheet 6 and the absorbent body 4. Is provided. That is, the adhesive constituting the second adhesive layer 21 is directly applied to the surface side of the absorbent body 4, and the second sheet 6 is laminated on the upper surface thereof, whereby the second sheet 6 and the absorbent body 4 are The two adhesive layers 21 are directly joined. In the case where an encapsulating sheet surrounding the absorbent body 4 is provided, the second adhesive layer 21 is preferably formed between the second sheet 6 and the encapsulating sheet.

  As shown in FIGS. 1 and 2, the second adhesive layer 21 is formed on the outer side in the width direction than the first adhesive layer 20. Forming on the outer side in the width direction from the first adhesive layer 20 means that the end on the longitudinal center line side of the second adhesive layer 21 is on one half of the sanitary napkin 1 with the longitudinal center line as a boundary. This means that the first adhesive layer 20 is located on the outer side (side edge side of the sanitary napkin 1) from the end on the longitudinal center line side. As a result, the body fluid that has been dammed by the first adhesive layer 20 and permeated through the second sheet 6 can be effectively dammed by the second adhesive layer 21 from diffusing outward in the width direction. As shown in FIG. 1, the first adhesive layer 20 and the second adhesive layer 21 are preferably provided so as to have a separating portion that is spaced apart in the width direction in plan view, but partly in plan view. You may provide so that it may overlap.

  The position in the napkin width direction for forming the second adhesive layer 21 is preferably formed along both side edges of the absorbent body 4 as shown in FIG. As a result, the second sheet 6 is adhered to the absorbent body 4 while preventing the end portion from being turned over, and the body fluid that is dammed by the second adhesive layer 21 and permeates the lower layer side is surely attached to the absorbent body 4. Be absorbed. When the side edge of the absorber 4 is formed in a straight line along the longitudinal direction as in the illustrated example, the second adhesive layer 21 is a straight line along the longitudinal direction in accordance with the side edge of the absorber 4. In the case where the side edge of the absorbent body 4 has a curved or inclined straight line, it may be formed by a straight line along the longitudinal direction, or may be curved or inclined according to the side edge of the absorbent body 4 You may form so that it may have a straight line.

  The range of the second adhesive layer 21 in the napkin longitudinal direction is longer than the first adhesive layer 20 in the napkin longitudinal direction, as shown in FIG. Forming long in the napkin longitudinal direction means that the front end of the second adhesive layer 21 is formed to extend forward in the napkin longitudinal direction from the front end of the first adhesive layer 20, and the rear end of the second adhesive layer 21 is In other words, the first adhesive layer 20 is formed so as to extend rearward from the rear end of the napkin in the longitudinal direction. By forming the second adhesive layer 21 longer in the longitudinal direction of the napkin than the first adhesive layer 20, the body fluid dammed up by the first adhesive layer 20 and permeating the lower layer side is diffused in the longitudinal direction while being spread in the width direction outside. Even if it diffuses, the second adhesive layer 21 can completely dam.

  As shown in FIG. 1, the front and rear ends of the second adhesive layer 21 may be formed to extend to the front and rear ends of the sanitary napkin 1, but at least with respect to the longitudinal dimension of the sanitary napkin 1. By forming with a length of 70% or more, it becomes possible to sufficiently cope with body fluid that diffuses between the second sheet 6 and the absorber 4 outward in the width direction. As shown in FIG. 1, when the embossed groove 10 surrounding the blood drainage port H is provided, the body fluid blocked by the embossed groove 10 is prevented from diffusing outward beyond the embossed groove 10. The second adhesive layer 21 is preferably formed in a range longer than the emboss groove 10 in the napkin longitudinal direction.

  Next, as shown in FIGS. 1 and 3, the third adhesive layer 22 is formed along the width direction at both ends in the longitudinal direction of the sanitary napkin 1. As shown in FIG. 1, the third adhesive layer 22 has a curved line that bulges outward in the longitudinal direction when the outline of the sanitary napkin 1 in the longitudinal direction ends. It is preferable to form it in a curved shape that bulges outward in the longitudinal direction.

  The third adhesive layer 22 is preferably formed between the liquid-permeable surface sheet 3 and the second sheet 6 and is applied at the same time in the step of applying the first adhesive layer 20. For simultaneous application with the coating process of the first adhesive layer 20, a plurality of unit adhesive layers 22a having a short linear pattern along the longitudinal direction of the napkin are provided in the napkin width direction as in the case of the first adhesive layer 20. It is preferable to form an adhesive layer along the width direction of the napkin as a whole by arranging without gaps. At this time, since the plurality of unit adhesive layers 22a, 22a... Is a linear pattern along the napkin longitudinal direction, as shown in FIG. 1, when the outline of the napkin longitudinal end is a curved line. Is applied so that the unit adhesive layer 22a is slightly shifted back and forth.

  The third adhesive layer 22 is preferably formed so that the inner edge in the longitudinal direction of the napkin extends to a position where it overlaps the absorbent body 4. Thereby, when the bodily fluid dammed up by the inner edge of the third adhesive layer 22 penetrates into the lower layer side, it is absorbed and held by the absorbent body 4.

  The range of the third adhesive layer 22 in the napkin width direction is preferably a range in which the absorber 4 is interposed, as shown in FIG. As a result, the body fluid that has been dammed by the third adhesive layer 22 and permeated the lower layer side can be absorbed and held in the absorbent body 4. The third adhesive layer 22 and the second adhesive layer 21 may partially overlap at the end in the napkin longitudinal direction, and as shown in FIG. The third adhesive layer 22 may be provided outside the napkin in the longitudinal direction.

  The first adhesive layer 20, the second adhesive layer 21, and the third adhesive layer 22 are formed in a substantially strip shape having a predetermined width continuous in the napkin longitudinal direction or the napkin width direction by applying the adhesive in a planar shape. Is formed. By applying the adhesive in a planar shape, an adhesive part to which the adhesive is applied is formed over the entire surface of each adhesive layer, and intermittently mixed with an adhesive part and a non-adhesive part. Compared to those, the body fluid damming effect is improved.

  In applying the adhesive in a planar shape, it is preferable to form the adhesive layer by applying a hot melt adhesive by contact-type slot coating. In the case of a non-contact coating method such as spray coating or curtain coating, the adhesive splatters from the nozzle and the edge of the adhesive application area becomes unclear. The stopping effect is reduced. On the other hand, by forming the adhesive layer by contact-type slot coating, the peripheral edge of the adhesive layer becomes clear, and the effect of blocking body fluid can be further improved. In addition, intermittent application with a mixture of bonded and non-bonded parts, such as spiral coating and spray coating, makes it easy for body fluids to enter the non-bonded part beyond the bonded part, and the damming effect is sufficient. Not. On the other hand, by using the contact-type slot coating, an adhesive is applied over the entire surface of the adhesive layer, so that intrusion of body fluid into the adhesive layer can be prevented, The damming effect can be improved.

  The preferred dimensions of the first adhesive layer 20, the second adhesive layer 21 and the third adhesive layer 22 are 1 mm to 1 mm as the width L1 of the first adhesive layer 20, as shown in FIGS. 10 mm, preferably 2 mm to 5 mm, the length L2 of the first adhesive layer 20 is 50 mm to 100 mm, preferably 55 mm to 65 mm, and the left and right separation width L3 is 30 mm to 55 mm The thickness is preferably 40 mm to 50 mm. The width L4 of the second adhesive layer 21 is 5 mm to 20 mm, preferably 7 mm to 13 mm. The length L5 of the second adhesive layer 21 is 190 mm to 300 mm, preferably about 220 mm to 250 mm. The left and right separation width L6 is 50 mm to 70 mm, preferably 60 mm to 70 mm. Further, the separation width L7 between the first adhesive layer 20 and the second adhesive layer 21 is 3 mm to 15 mm, preferably 3 mm to 7 mm. The unit adhesive layer 22a constituting the third adhesive layer 22 has a width L8 of 3 to 30 mm, preferably 15 to 25 mm, and the unit adhesive layer 22a has a length L9 of 5 mm. -25 mm, preferably 5 mm to 15 mm.

The basis weight of the adhesive of the first adhesive layer 20, the second adhesive layer 21, and the third adhesive layer 22 is 5 g / m ^{2 to} 50 g / m ² , preferably 20 g / m ^{2 to} 40 g /. good to the m ^2.

  As the pressure-sensitive adhesive forming the adhesive layers 20 to 22, for example, a styrenic polymer, a tackifier, or a plasticizer is preferably used as a main component. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, and styrene-isoprene-styrene copolymers. It may be used or two or more polymer blends. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

  Next, modifications of the sanitary napkin 1 will be described with reference to FIGS. In the sanitary napkin 1 shown in FIG. 5 and FIG. 6, both embossments 14 are formed along the longitudinal direction by pressing from the surface side of the liquid-permeable surface sheet 3 in the region of the first adhesive layer 20. Has been given. The both-side embossing 14 is disposed in the region of the first adhesive layer 20 and is spaced apart from the central embossing 11 on both sides in the widthwise direction of the central embossing 11 along the longitudinal direction of the napkin, It is formed substantially parallel to both sides of the central emboss 11. By providing the embosses 14 on both sides, the flow of body fluid to the outside in the width direction is blocked, and side leakage can be prevented. Further, as shown in FIG. 7, the first adhesive layer 20 is provided between the liquid-permeable surface sheet 3 and the second sheet 6 in the portion where the both-side embossing 14 is applied. When the polymer absorbs water and expands, the expansion of the polymer is suppressed by the compressive force of the embosses 14 on both sides, and the body fluid absorbed by the polymer can be prevented from returning to the surface side of the liquid-permeable surface sheet 3. Thereby, it is also possible to avoid side leakage of the body fluid that has been reversed.

  In the illustrated example, the both side embosses 14 are formed in a curved shape that bulges outward in the width direction so as to be parallel to a portion along the longitudinal direction of the napkin of the adjacent central emboss 11, but bulges inward in the width direction. It may be formed by a curved line or a straight line, a wavy line that repeats unevenness in the width direction, or the like.

  The first adhesive layer 20 is formed in a range including the both-side embossing 14, that is, a range larger than the both-side embossing 14. In addition, the first adhesive layer 20 is formed in a range where the thickness does not decrease due to the embossing 14 on both sides, specifically, in a range having a thickness of 80% or more with respect to the thickness of the portion not affected by pressing. Is preferred. As a result, it is possible to reliably prevent reversing up to a range where the influence of the pressing due to the embossing 14 on both sides hardly reaches.

  Next, a modification of the sanitary napkin 1 shown in FIG. 8 will be described. In this sanitary napkin 1, in order to enhance the effect of preventing front and rear leakage at both ends of the napkin in the longitudinal direction, both or either of the front side and the rear side of the embossed groove 10 between the liquid-permeable surface sheet 3 and the second sheet 6 are provided. Furthermore, a fourth adhesive layer 23 is formed along the embossed groove 10 by applying an adhesive on the surface. That is, the fourth adhesive layer 23 has a rear emboss 13 disposed on the front side and the rear side of the front emboss 12 disposed on the front side of the emboss groove 10 formed so as to surround the blood drainage port H. It is formed in both or one of the regions on the rear side. Thereby, the body fluid which is going to diffuse to the outside in the longitudinal direction from the front embossing 12 or the rear embossing 13 is blocked by the fourth adhesive layer 23, and the front-rear leakage can be surely prevented. On the other hand, in order to promote the diffusion of body fluid inside the front emboss 12 and the rear emboss 13 formed in an Ω shape or a reverse Ω shape, an adhesive layer is not provided inside these embosses. In the illustrated example, the fourth adhesive layer 23 is provided on both the front side of the front emboss 12 and the rear side of the rear emboss 13. However, the fourth adhesive layer 23 may be provided only on one of them.

  A sanitary napkin 1 according to the present invention in which the adhesive layer shown in FIGS. 1 to 3 is formed in a predetermined region by contact-type slot coating (Example), a sanitary napkin without the adhesive layer ( Comparative Example 1), a sanitary napkin (Comparative Example 2) in which the adhesive layer was formed in a predetermined region by spiral coating was subjected to a test for comparing the diffusion range of body fluids.

In the sanitary napkin 1 according to the embodiment, the first adhesive layer 20 and the second adhesive layer 21 are formed, and the basis weight is 30 g / m ² . The dimension of each part shown by FIG.1 and FIG.2 was L1 = 5mm, L2 = 60mm, L3 = 45mm, L4 = 10mm, L5 = 240mm, L6 = 65mm, L7 = 5mm.

In the sanitary napkin according to Comparative Example 2, the adhesive layers corresponding to the first adhesive layer 20 and the second adhesive layer 21 are respectively applied in a continuous spiral shape with a hot melt adhesive. The basis weight of the adhesive is 10 g / m ² and the spiral pitch is about 5 mm. The width of the adhesive layer corresponding to the first adhesive layer 20 was 10 mm, and the width of the adhesive layer corresponding to the second adhesive layer 21 was 20 mm. Other dimensions are the same as in the above embodiment.

  The test method is as follows: The artificial menstrual blood diffusion range at each time when 3 cc of artificial menstrual blood (viscosity 8) is repeatedly dropped 3 times at 1 minute intervals into the central portion of the liquid-permeable surface sheet of each napkin. (Maximum length in the longitudinal direction and width direction of the napkin) was measured with a ruler. The artificial menstrual blood used was a component of 100 ml of glycerin, 4.6 g of CMC (carboxymethylcellulose sodium), 875 ml of purified water, 10 g of sodium chloride, and 10.7 g of sodium carbonate.

  As a result, as shown in Table 1, in Comparative Example 1 in which the adhesive layer is not provided, body fluid easily diffuses in a wider range in the width direction as compared with Comparative Example 2 and Example in which the adhesive layer is provided. .

  Further, in Comparative Example 2 in which the adhesive layer was applied in a spiral pattern, since the curved adhesive portion and the non-adhesive portion coexist, body fluid easily enters the non-adhesive portion beyond the adhesive portion. Thus, the body fluid diffuses over a wide range in the width direction.

  On the other hand, in the example, the adhesive layer is formed by applying the adhesive in a planar shape, so that the body fluid that diffuses outward by the adhesive layer is reliably dammed up, Comparative Example 1, Compared with 2, diffusion in the width direction can be suppressed.

From the above results, by providing an adhesive layer in which the adhesive is applied in a planar shape in a predetermined region, diffusion of body fluid is suppressed, and body fluid before being absorbed by the absorber diffuses between the sheets to the outside. It will be possible to prevent leakage.

[Other examples]
In the above embodiment, a hydrophilic second sheet 6 is disposed between the liquid-permeable surface sheet 3 and the absorber 4, and the first adhesive layer 20 is disposed on the liquid-permeable surface sheet 3 and the second sheet 6. 9 and the second adhesive layer 21 was formed between the second sheet 6 and the absorbent body 4, but instead of this, as shown in FIG. Without disposing, the absorbent body 4 is surrounded by the encapsulating sheet 5, the first adhesive layer 20 is formed between the liquid-permeable surface sheet 3 and the encapsulating sheet 5, and the second adhesion The agent layer 21 may be formed between the encapsulating sheet 5 and the absorber 4. As a result, the second sheet 6 is not necessary, and the raw material cost can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Absorber, 6 ... Second sheet, 7 ... Side nonwoven fabric, 10 ... Embossed groove, 11 ... Center emboss, 12 ... Front embossing, 13 ... Rear embossing, 14 ... Both sides embossing, 20 ... First adhesive layer, 21 ... Second adhesive layer, 22 ... Third adhesive layer, 23 ... Fourth adhesive layer

Claims (8)

In the absorbent article in which an absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and an intermediate sheet is disposed between the liquid-permeable surface sheet and the absorbent body,
A first adhesive layer in which an adhesive is applied in a planar shape is formed along the longitudinal direction on both sides in the width direction of the region corresponding to the body fluid discharge site between the liquid-permeable surface sheet and the intermediate sheet. In addition, the adhesive is faced along the longitudinal direction in a region outside the first adhesive layer between the intermediate sheet and the absorbent body in the width direction and longer in the longitudinal direction than the first adhesive layer. An absorbent article, characterized in that a second adhesive layer applied in a shape is formed.   A third adhesive layer in which an adhesive is applied in a planar shape is formed along the width direction at both ends in the longitudinal direction of the absorbent article between the liquid-permeable surface sheet and the intermediate sheet. Item 10. An absorbent article according to Item 1.   The absorbent article according to claim 1, wherein each of the adhesive layers is formed by contact-type slot coating.   The absorbent article according to claim 1, wherein the second adhesive layer is formed with a length of 70% or more with respect to the longitudinal dimension of the absorbent article. An embossed groove is formed so as to surround the body fluid discharge site on the surface side of the liquid-permeable surface sheet,
The said adhesive layer is an absorbent article in any one of Claims 1-4 currently formed in the outer side from the said embossing groove | channel.   The both sides embossing is formed in the area | region of a said 1st adhesive bond layer along the longitudinal direction by the pressing from the surface side of the said liquid-permeable surface sheet, The absorptivity in any one of Claims 1-5. Goods. An embossed groove is formed so as to surround the body fluid discharge site on the surface side of the liquid-permeable surface sheet,
A fourth adhesive layer in which an adhesive is applied in a planar shape along the embossed groove on either or both of the front side and the rear side of the embossed groove between the liquid-permeable surface sheet and the intermediate sheet. The absorbent article in any one of Claims 1-6 formed.   The absorption according to any one of claims 1 to 7, wherein the intermediate sheet is a hydrophilic second sheet disposed between the liquid-permeable surface sheet and the absorber or an encapsulating sheet surrounding the absorber. Sex goods.

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