JP2011104014A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which prevents leakage of body fluids at side parts and shows an excellent leakproof property. <P>SOLUTION: Both side edges 2s, 2s of a surface sheet 2 are positioned on the same places as both side edges 4s, 4s of an absorber 4 or outside both side edges 4s, 4s in the width direction. A pair of side leakproof members 5, 5 are each configured by containing side sheets 6 for covering a side part of the surface sheet 2. At least one part of the side sheet 6 is joined to a side part of the surface sheet 2 in the outside of the inner side edge part 61 in the width direction, and an opening part 71 which opens when being worn is formed between the joining part 8 and the inner side edge part 61. Water-shedding treatment is performed on both side parts 21, 21 covered with the side sheet 6 in the surface sheet 2 and/or on surfaces facing the surface sheet 2 in the side sheet 6. Ink is applied to the parts where the water-shedding treatment is performed so that the parts are visible when the absorbent article 1 is seen from a skin abutment surface side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (cage sheet), and an incontinence pad.

  In absorbent articles such as sanitary napkins, leakage of body fluid at the side of the article often becomes a problem, and various techniques for solving such problems have been proposed. For example, Patent Document 1 describes a nonwoven fabric obtained by alternately laminating a hydrophilic nonwoven fabric and a hydrophobic nonwoven fabric in a specific arrangement. A hydrophilic thermoplastic fiber is provided at the center of the nonwoven fabric in the width direction, and the hydrophilic It is described that a nonwoven fabric in which hydrophobic thermoplastic fibers are positioned and integrated on both side edges of thermoplastic fibers is effective as a surface sheet or the like for absorbent articles. Patent Document 2 includes an absorbent main body having an absorbent layer and a leak-proof layer, and a pair of side sheets partially joined to both side portions on the skin contact surface side of the absorbent main body. And the absorbent article in which the pocket opened at the time of mounting | wearing was formed between the junction part and inner edge part of this side sheet | seat is described.

  In addition, it is known that a predetermined portion of the absorbent article is provided with colors and designs that can be visually recognized from the outside by printing or the like. For example, Patent Document 3 describes an absorbent article in which a pattern is formed by printing on a pair of side leakage preventing members provided on the skin contact surface side of the absorbent main body. In the absorbent article described in Patent Document 3, the design is made so as not to substantially contact the wearer's skin, and specifically, a recess provided on the skin contact surface side of the side leak-proof member. The pattern formed by transferring the ink to the bottom of is shown. In Patent Document 4, a concave portion is provided on the skin contact surface side of the absorbent main body and outside the absorbent body, and a printed portion to which ink is transferred is provided at the bottom of the concave portion to form a pattern. Absorbent articles are described.

  Further, in Patent Document 5, in an absorbent article including a top sheet, a back sheet, and an absorbent body disposed between both sheets, a member positioned above the absorbent body (for example, the top sheet and the absorbent body) It is described that an ink application region is provided on the second surface sheet, which is interposed between them, with increased hydrophobicity and at least partially visible in the finished article.

JP-A-2-229254 JP 2006-280765 A JP 2006-181192 A JP 2006-181193 A Special table 2009-512489 gazette

  The techniques described in Patent Documents 1 to 4 have been devised to prevent leakage of body fluids at the side portions of the absorbent article, and the technique described in Patent Document 5 where such a technique is not applied. Compared with this, high leakage resistance can be achieved. However, the current situation is that even higher leak-proof properties are required, and no absorbent article that meets this requirement has yet been provided. In addition, for example, when a user of a sanitary napkin sees body fluids such as menstrual blood adhering to the side of the napkin after use, the leakage occurred even though no leakage actually occurred Many people feel the same discomfort and anxiety about leakproofness that they feel in some cases, and the solution of such problems is desired.

  Therefore, the subject of this invention is providing the absorbent article which prevents the leakage of the bodily fluid in a side part and expresses high leak-proof property.

  The present invention relates to a substantially vertically long absorbent body comprising a liquid retaining absorbent body and a surface sheet disposed on the skin contact surface side of the absorbent body, and both side portions along the longitudinal direction of the absorbent body. Is the absorbent article provided with a pair of side leakage preventing members disposed on each of the side sheets, and whether both side edges along the longitudinal direction of the surface sheet are at the same position as both side edges along the longitudinal direction of the absorber Or a pair of the side leakage preventing members that are located on the outer side in the width direction from both side edges along the longitudinal direction of the absorber, and each of the pair of side leakage preventing members covers side portions along the longitudinal direction of the topsheet. The side sheet is at least partially joined to the side portion of the topsheet in the width direction outside of the inner edge along the longitudinal direction, and the joint portion and Between the inner edge and the inner Openings that stand up and open inwardly are formed, and are formed on both side portions of the topsheet that are covered with the sidesheet and / or on the surface of the sidesheet that faces the topsheet. Provided with an absorbent article that has been subjected to water treatment and the water-repellent treatment has been provided with ink and is visible when the absorbent article is viewed from the skin contact surface side By doing so, the above-mentioned problems are solved.

  According to the absorbent article of the present invention, leakage of body fluid at the side portion is effectively prevented by the side leakage preventing member and the water repellent treatment applied to the side leakage preventing member and / or the surface sheet in the vicinity thereof. Is done.

  In addition, since the water-repellent-treated portion is provided with ink and is visible when the skin contact surface of the absorbent article is visually observed, the user can be assured of leakage resistance. Furthermore, the body fluid such as menstrual blood adhering to the water-repellent treated portion is concealed to reduce the user's discomfort and anxiety about leakage prevention due to the body fluid adhesion. be able to.

FIG. 1 is a plan view schematically showing a skin contact surface side (surface sheet side) of a sanitary napkin that is a first embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is a partially enlarged plan view schematically showing an enlarged part of the side sheet in the napkin shown in FIG. 1. FIG. 4: is a top view which shows typically the skin contact surface side (surface sheet side) of the sanitary napkin which is 2nd Embodiment of the absorbent article of this invention. FIG. 5 is a sectional view schematically showing a section taken along line II-II in FIG. 6 is a cross-sectional view schematically showing a cross section taken along line III-III in FIG. FIG. 7 is a view corresponding to FIG. 5 of a sanitary napkin that is a third embodiment of the absorbent article of the present invention. FIG. 8 is a view corresponding to FIG. 5 of a sanitary napkin that is a fourth embodiment of the absorbent article of the present invention.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. The napkin 1 of 1st Embodiment is substantially equipped with the surface sheet 2 arrange | positioned at the skin contact surface side of the liquid holding | maintenance absorber 4 and this absorber 4, as shown in FIG.1 and FIG.2. A vertically long absorbent main body 10 and a pair of side leak-proof members 5 and 5 disposed on both sides along the longitudinal direction of the absorbent main body 10 are provided.

  More specifically, the absorbent main body 10 is interposed between the top sheet 2 that forms the skin contact surface of the napkin 1, the back sheet 3 that forms the non-skin contact surface of the napkin 1, and both the sheets 2 and 3. 1 and has a long shape (substantially rectangular shape) in one direction in a plan view as shown in FIG. The absorptive main body 10 (napkin 1) has the front part A, the center part B, and the back part C in the longitudinal direction. The front part A, the central part B, and the rear part C in the napkin 1 of the first embodiment substantially correspond to each region when the absorbent main body 10 is divided into three in the longitudinal direction.

  In the present specification, the skin contact surface is a surface of the absorbent article or a component thereof that faces the wearer's skin when the absorbent article is mounted, and the non-skin contact surface is the absorbent article. Alternatively, the surface of the member is directed to the side opposite to the skin side (clothing side) when the absorbent article is mounted. Moreover, a longitudinal direction is a direction along the long side of an absorbent article or its structural member, and a width direction is a direction orthogonal to this longitudinal direction. In the drawing, the direction indicated by the symbol X is the article longitudinal direction (napkin longitudinal direction), and the direction indicated by the symbol Y is the article width direction (napkin width direction).

  As shown in FIG. 2, both side edges 2 s and 2 s along the longitudinal direction X of the topsheet 2 are located outward in the width direction Y from both side edges 4 s and 4 s along the longitudinal direction X of the absorbent body 4. . More specifically, the top sheet 2 covers the entire area of the skin contact surface of the absorbent body 4, and further extends outward in the width direction from the left and right side edges 4 s and 4 s of the absorbent body 4. In this way, when both side portions (both side edges 2s, 2s and their vicinity) along the longitudinal direction of the topsheet 2 extend outward in the width direction of the absorber 4, for example, the both side portions are the absorber 4 Since the dimension in the width direction Y of the top sheet 2 is shorter than the case where the top sheet 2 is interposed between the absorber 4 and the back sheet 3, the amount of the napkin component used is reduced. This reduces the manufacturing cost.

  As shown in FIG. 2, the back sheet 3 covers the entire area of the non-skin contact surface of the absorbent body 4 and further extends outward in the width direction from the left and right side edges 4 s and 4 s along the longitudinal direction X of the absorbent body 4. The extended portion and the extended portion of the surface sheet 2 described above are joined to each other by a known joining means such as an adhesive, heat seal, ultrasonic seal or the like. Further, the top sheet 2 and the back sheet 3 extend outward in the longitudinal direction from the front and rear ends of the absorbent body 4 in the longitudinal direction X, and are joined to each other by known joining means at their extending portions. As shown in FIG. 1, the absorber 4 has a substantially rectangular shape with rounded corners in plan view. The top sheet 2 and the back sheet 3 may be bonded to the absorber 4 with an adhesive.

  The left and right side portions in the longitudinal direction X on the skin contact surface (skin contact surface 2a of the topsheet 2) side of the absorbent main body 10 have both side portions (both side edges 4s, 4s and their side edges) of the absorbent body 4 in plan view. A pair of side leakage preventing members 5, 5 are arranged along the longitudinal direction X over substantially the entire length of the napkin 1 in the longitudinal direction X so as to overlap each other in the vicinity. Each of the pair of side leakage preventing members 5 and 5 includes a side sheet 6 that covers a side portion along the longitudinal direction X of the topsheet 2.

  As shown in FIG. 2, the side sheet 6 has a portion 6 </ b> A located near the center in the width direction Y of the napkin 1 as two layers by folding the sheet, and the folded part is the inner edge of the side sheet 6. Part 61 is formed. As shown in FIG. 1, the inner edge portion 61 is formed in a linear shape extending in the longitudinal direction X on the center portion side in the width direction Y of the napkin 1. As described above, when the side sheet 6 is folded in two layers so that the folded portion is located on the center side in the width direction Y of the napkin 1, an opening 71 (described later) is easily opened during mounting. preferable. The part 6 </ b> A in the side sheet 6 is fixed to the back sheet 3 together with the top sheet 2 at the front and rear ends in the longitudinal direction X of the napkin 1 by a known joining means. Moreover, the part 6B located in the outer side of the width direction Y of the napkin 1 in the side sheet 6 is joined to the back sheet 3 by a known joining means. The back sheet 3 and the side sheet 6 have a maximum extension length in the width direction Y from the side edge 4s of the absorbent body 4 in the central portion B. Wings 7, 7 are formed.

  As shown in FIG. 2, the side sheet 6 has a skin contact surface 2 a on the side of the top sheet 2 on the absorbent body 4 outside the inner edge 61 along the longitudinal direction X in the width direction Y. The inner edge portion 61 stands up and opens to the inner side in the napkin width direction Y between the joint portion (first joint line 8) and the inner edge portion 61 at the time of mounting. 71 is formed. More specifically, each of the pair of side sheets 6, 6 includes a first joining line 8 that is concave toward the center side in the width direction Y of the absorbent main body 10, and a longitudinal direction of the first joining line 8. It is joined to the absorptive main body 10 by the 2nd joining line 9 which is located before and behind X, and extends so that the longitudinal direction of the absorptive main body 10 may be crossed, and the 1st joining line in each of a pair of side sheets 6 and 6 8 and an inner edge 61 are formed between the surface sheet 2 and an opening 71 that is opened during mounting.

  As shown in FIG. 1, the pair of first joining lines 8, 8 is provided in the central portion B having the pair of wing portions 7, 7. A central region in the width direction Y of the central portion B is an excretion portion facing portion (not shown) facing the excretion portion of the wearer of the napkin 1, and the pair of first joining lines 8 and 8 are the excretion portions. It exists on the left and right sides of the longitudinal direction X of the napkin 1 across the part-opposing part.

  As shown in FIG. 3, the first joining line 8 extends in the longitudinal direction X in an arc shape, and has portions 81 and 81 that are close to the inner edge 61 and a portion 82 that is far from the inner edge 61. The length L1 in the longitudinal direction of the first joint line 8 and the separation distance W1 (oscillation width) between the portion 81 near the inner edge 61 of the first joint line 8 and the portion 82 far from the inner edge 61 are: It is preferable that the relationship of L1> W1 is satisfied. L1 preferably has a length of 10 to 50% with respect to the total length (product length) of the napkin 1 in the longitudinal direction X. In the first embodiment, the length L1 of the first joining line 8 is substantially the same as the length of the base portion of the wing portion 7. Further, W1 preferably has a width of 3 to 30% with respect to the product width. The product width here means the length in the width direction between the front and rear end portions of the pair of wing portions 7 and 7 in the napkin 1. Further, the terms “near” and “far” as used herein have a relative meaning that they are nearer than a far part and farther than a close part.

  The first and second joining lines 8 and 9 are preferably one joining line that is substantially continuous as a whole. That is, the first joint line 8 and the second joint line 9 are substantially continuous joint lines, and the first joint line 8 and the second joint line 9 are also substantially continuous. It is preferable. The term “substantially continuous” means that, in addition to the continuous joining line as in the first embodiment, 1) a plurality of joined parts are assumed to be an arbitrary straight line parallel to the width direction Y of the napkin 1 and the straight line. It is arranged continuously so that there are no overlapping parts, or 2) It consists of many discontinuous joints when viewed microscopically, but as a whole, linear joints are formed It includes a joining line formed by arranging a number of joining portions in the longitudinal direction X of the napkin 1 so as to overlap each other.

  As shown in FIG. 2, the first joining line 8 is formed by joining a part of the portion 6 </ b> A located near the center of the napkin 1 in the width direction by a known joining means such as heat embossing. Has been. The first joint line 8 may be formed by pressing the side sheet 6 together with the top sheet 2 and the absorber 4. In this case, there is an advantage that liquid bleeding and diffusion are suppressed by the groove formed in the first joint line 8 portion.

  A portion 62 (see FIG. 3) between the inner edge 61 and the first joining line 8 in each of the pair of side sheets 6, 6 is not joined to the topsheet 2, and the portion 62 and the topsheet 2 An opening 71 (see FIG. 1) is formed therebetween. The opening 71 is opened when the napkin 1 is mounted, and body fluid that has moved in the width direction Y of the napkin 1 is captured in the space formed by the opening, so that the leakproof property of the napkin can be improved. Moreover, since it can be easily understood that the leak-proof property in the width direction is high in appearance, it is also preferable in terms of giving the wearer a sense of security.

  Furthermore, at least a part of the first joining line 8 overlaps with the absorber 4 in plan view, so that the liquid captured by the opening 71 is smoothly absorbed by the absorber 4 and the leakage prevention property is further improved. This is preferable. The liquid captured by the opening 71 is absorbed by the absorber 4 while moving from the front of the opening 71 to the back, or reaches the back of the opening 71 and then returns to the absorber 4 side for absorption. Is done. Here, it overlaps with the absorber 4 in a plan view means that the whole or part of the first joining line 8 is an area where the absorber 4 is disposed (in FIG. 1, the outline of the absorber 4 is shown). It means to exist within the area surrounded by a dotted line. It is preferable that a part of the swing width W1 (see FIG. 3) of the first joining line 8 overlaps the absorber 4, and that the entire swing width W1 overlaps the absorber 4. preferable. In the first embodiment, as shown in FIG. 1, the first joining line 8 has the entire swinging width W1 overlapping the absorber 4 over the entire length thereof.

  As shown in FIG. 3, the second joint lines 9 positioned before and after the first joint line 8 in the longitudinal direction X alternately have portions 91 close to the inner edge 61 and portions 92 far from the inner edge 61. And zigzag shape along the longitudinal direction X. Between the portion 91 close to the inner edge portion 61 and the portion 92 far from the inner edge portion 61, the joining line forming the second joining line 9 extends and is connected so as to intersect the longitudinal direction X. To describe further, the second joining line 9 has a shape in which arc-shaped portions that are convex toward the center side in the width direction Y of the napkin 1 and arc-shaped portions that are concave toward the center side are alternately connected. The napkin 1 does not have a portion parallel to the longitudinal direction X.

  In the second joint line 9, the distance L2 between the portions 91, 91 close to the adjacent inner edge 61 is shorter than the length L1 in the longitudinal direction X of the first joint line 8, as shown in FIG. Yes. The distance L <b> 2 is a length obtained by measuring the distance between the points 91 and 91 close to the adjacent inner edge 61 between the points closest to the inner edge 61 along the longitudinal direction X. Further, the separation distance W3 (oscillation width) between the portion 91 near the inner edge 61 of the second joint line 9 and the portion 92 far from the inner edge 61 is larger than the seal width W2 of the first joint line 8 described above. Longer is preferred. The first joint line 8 has a predetermined width, and both side edges of the first joint line 8 can be regarded as two parallel straight lines microscopically. Therefore, the seal width W2 is defined between the two parallel straight lines. The distance.

  A portion 63 (see FIG. 3) between the second joining line 9 and the inner edge 61 in each of the pair of side sheets 6 and 6 is not joined, and an opening is provided between the portion 63 and the top sheet 2. A portion 72 is formed. The opening 72 is preferably opened when the napkin 1 is mounted, like the openings 71 located on the left and right sides in the longitudinal direction X across the excretory part-facing part.

  Similarly to the first bonding line 8, the second bonding line 9 is a part of the portion 6 </ b> A located near the center in the width direction Y of the napkin 1 by a known bonding means such as heat embossing. It is formed by bonding. In addition, for the joining of the second joining line 9 and the absorbent main body 10, the description of the first joining line 8 described above is appropriately applied. Further, as shown in FIG. 1, at least a part of the second bonding line 9 overlaps with the absorber 4 in a plan view, so that the liquid captured by the opening 72 is smoothly absorbed by the absorber 4. This is preferable because the leak-proof property is further improved.

  The length L1 in the longitudinal direction X of the first joint line 8 in the napkin 1 of the first embodiment is preferably 40 to 100 mm, and the length in the longitudinal direction X of the second joint line 9 (region where meandering is repeated) ) Is preferably 4 to 50 mm, and L1 is preferably longer. Moreover, it is preferable that the said distance L2 in the 2nd joining line 9 is 4-30 mm. L2 / L1 is preferably 4 to 75%. The swing width W1 of the first joint line 8 is preferably 2 to 15 mm, and the swing width W3 of the second joint line 9 is preferably 2 to 15 mm. W1 is preferably the same as W3 or larger than W3.

  In the first embodiment, water repellent treatment is performed on both side portions of the top sheet 2 covered with the side sheet 6. That is, as shown in FIG. 2, the entire area of both sides of the top sheet 2 from the portion located below the inner edge 6 of the pair of side sheets 6, 6 to the side edge 2 s is the side sheet 6. The side sheet covering portion 21 is covered with a water repellent treatment, and the whole or a part of the side sheet covering portion 21 is water repellent.

  As described above, the water repellent treatment is performed on both side portions (side sheet covering portion 21) of the topsheet 2 that is disposed so as to cover the left and right side portions of the absorbent body 4 and is covered with the side sheet 6. This effectively prevents bleeding of the body fluid in the side portion of the napkin 1, and coupled with the effect of capturing the body fluid moved in the width direction Y of the napkin 1 by the side leakage preventing member 5 (side sheet 6), The leakage of body fluid at both sides of the napkin 1 is effectively prevented. Such a water repellent treatment is particularly effective when the top sheet 2 is a sheet subjected to a hydrophilic treatment.

  The water repellent treatment can be performed by applying a water repellent to a predetermined portion of the top sheet 2. Conventionally known water repellents can be used as the water repellent, and examples thereof include various sizing agents, silicone resins, and fluororesins. The application of the water repellent is performed by coating, impregnating, spraying, etc., using a water repellent or a water repellent-containing liquid obtained by dissolving or dispersing the water repellent in a solvent using a known coating means. Can be implemented.

  The water repellent treatment may be performed on the entire side sheet covering portion 21 or may be performed on a part thereof, but from the viewpoint of more surely improving the leakage resistance by the water repellent treatment, at least the It is preferable to apply to the left and right sides in the longitudinal direction X of the napkin 1 with the excretory part facing part interposed therebetween. In the first embodiment, the water repellent property is applied to the entire region of the side sheet covering portion 21 of the topsheet 2 that extends over the front portion A, the central portion B, and the rear portion C and is located in the central portion B. Processing has been applied. That is, the portion of the top sheet 2 where the opening 71 is formed (the bottom of the opening 71. Between the first joining line 8 and the inner edge 61 of the side sheet 6 in plan view of the top sheet 2. And a portion extending outward in the width direction Y from the portion is subjected to water repellent treatment.

  The water repellent treatment may be applied to A) the skin contact surface of the top sheet 2 (opposite surface to the side sheet 6), and B) the non-skin contact surface of the top sheet 2 (opposite surface to the absorber 4) ) Or on both sides. The water repellent treatment method of A) is more effective than the water repellent treatment method of B) in terms of preventing bleeding of body fluids, and a portion that has been subjected to water repellent treatment by applying ink as described later. Is visually effective, it is also effective in improving the visibility. However, in order to perform a water-repellent treatment on the skin contact surface that is a joint surface with the side sheet 6, There is a concern that the bonding strength between the side sheets 6 is lowered. As will be described later, when the water repellent treatment is accompanied by a color treatment by applying printing ink, in the water repellent treatment method of A), the ink applied to the skin contact surface of the top sheet 2 is the side sheet 6. There is a concern about so-called color transfer that shifts to other members. On the other hand, the water repellent treatment method of B) is for water repellent treatment of the non-skin contact surface of the top sheet 2 that does not face the side sheet 6 and is not exposed to the skin contact surface side of the napkin 1. Inconveniences caused by the water repellent treatment method A) can be eliminated. In general, the water repellent treatment method of A) is preferable from the viewpoint of leakage prevention and visibility of the water-repellent treatment portion, and the water repellent treatment method of B) from the viewpoint of workability during the production of the napkin. Can be said to be preferable.

  In the first embodiment, the portion subjected to the water repellent treatment is provided with ink, and when the napkin 1 is viewed from the skin contact surface (skin contact surface 2a of the topsheet 2) side. Visible. That is, the side sheet covering portion 21 in the central portion B, which is the portion that has been subjected to the water repellent treatment, is provided with ink of a color other than the ground color (usually white) of the portion together with the water repellent by printing. Thus, it can be visually recognized from the skin contact surface 2a side through the side sheet 6 covering the portion. That is, the water repellent treatment in the first embodiment is performed by applying an ink containing a water repellent (water repellent ink) to a predetermined part by printing, and is accompanied by a coloring process by applying printing ink.

  In this way, the water-repellent treated portion is colored with ink and made visible by visual observation, so that the presence of the portion can be strongly appealed to the user, and the user can be prevented from leaking. A sense of security can be given to sex. In addition, since the water-repellent treated portion is colored with ink, the stain on the portion is less noticeable and the body fluid adhering to the portion is concealed. Anxiety about pleasure and leakproofness can be reduced.

From the viewpoint of making the portion subjected to the water repellent treatment more surely visible, when the side sheet 6 is a nonwoven fabric, the side sheet 6 is preferably composed of one nonwoven fabric layer. When the side sheet 6 is composed of the above nonwoven fabric layers, the total basis weight of all nonwoven fabric layers constituting the side sheets 6 is preferably 150 g / m ² or less. From the same viewpoint, when the side sheet 6 is a resin film, the light transmittance of the resin film is preferably 40% or more. From the same viewpoint, the nonwoven fabric or resin film constituting the side sheet 6 is formed with a large number of apertures penetrating the nonwoven fabric or the resin film in the thickness direction, and the water-repellent treatment is performed by the apertures. The visible part can also be made visible. The opening is preferably one having a diameter in the range of 0.3 to 2 mm.

The concealment effect of the body fluid by the application of such ink is particularly the color after coloring (ink color) of the portion subjected to the water repellent treatment, the color of the body fluid excreted (or the body fluid is water repellent treated). The color can be further enhanced by making the color similar to the color of the part when the part is soaked. For example, in the sanitary napkin as in the first embodiment, the color of the water-repellent part is changed from red to orange (Lab color) in accordance with the color of menstrual blood (red) that is excreted body fluid. A ^* ≧ -15, b ^* ≧ -15 in the system) or cold color (dark color) (range of a ^* ≦ 15, b ^* ≦ 15 in the Lab color system) preferable.

  The ink application pattern in the portion subjected to the water repellent treatment may be a so-called solid coating pattern in which ink is applied to substantially the entire area of the part (applying the entire area of the part with ink), A predetermined pattern composed of a formed figure, character, or the like may be arranged in a predetermined pattern. From the viewpoint of improving leakage prevention, the former solid coating pattern is preferable.

  The ink used in the present invention is not particularly limited as long as it is applicable to printing of this type of absorbent article. In addition to the water repellent described above, the ink contains dyes, pigments, and the like used in ordinary printing inks as coloring components, and usually contains various solvents, surfactants, and the like. Moreover, as an ink application method (water repellent treatment method), a normal printing method can be used as appropriate, and examples thereof include an ink jet printing method and a gravure printing method. The ink may be applied by in-line processing using an absorbent article manufacturing apparatus in which a printing apparatus such as an ink jet printer is incorporated, or a constituent member of the absorbent article (in the first embodiment, a surface sheet) Ink may be previously applied to 2) by printing, and an absorbent article may be produced using the printed component.

  As the surface sheet 2, various materials conventionally used in the technical field can be used without particular limitation, and for example, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to hydrophilic treatment are used. In particular, a nonwoven fabric is preferable. When a hydrophilic treated nonwoven fabric or the like is used as a surface sheet, there is a concern about bleeding of body fluid. In the present invention, such bleeding of body fluid can be prevented by the water repellent treatment described above. As a nonwoven fabric which can be used for the surface sheet 2, an air through nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric, a spun bond-melt blow nonwoven fabric, etc. are mentioned, for example.

  Further, as described above, since the surface sheet 2 is subjected to a water repellent treatment accompanied by a coloring process by the application of ink, from the viewpoint of improving the color developability of the ink, the surface sheet 2 is particularly preferably an ink. A non-woven fabric with good coatability, that is, a non-woven fabric in which constituent fibers are densely packed (the gap between fibers is relatively small) and the surface is smooth is preferable. Examples of such a non-woven fabric include an embossed air-through non-woven fabric; a non-woven fabric in which the ink coating surface is constituted by a denser structure with fibers of 2.2 dtex or less. Accordingly, the surface sheet 2 is particularly preferably one including these nonwoven fabrics.

  Moreover, as the side sheet | seat 6, the various things conventionally used in the said technical field can be especially used without a restriction | limiting, For example, the sheet | seat made from a water-repellent nonwoven fabric or a resin film can be used, for example. In particular, it is preferable to use a water-repellent air-through non-woven fabric from the viewpoint of touch and prevention of lateral leakage. As the side sheet 6, a laminate of a nonwoven fabric and a resin film can be used. Further, when the side sheet 6 is subjected to a water repellent treatment accompanied by a coloring process by the application of ink, similarly to the surface sheet 2, at least a portion to which the ink is applied (a portion to which the water repellent treatment is applied). It is preferable to use the same material as that of the surface sheet 2 described above.

  The napkin 1 according to the first embodiment will be described further. As shown in FIG. 1, the absorbent body 4 and the napkin 1 in the plan view of the napkin 1 on the skin contact surface of the napkin 1 (skin contact surface 2 a of the surface sheet 2). In the overlapping region, a linear groove portion 11 in which the top sheet 2 and the absorber 4 are integrally recessed toward the back sheet 3 is formed. The groove part 11 forms a closed ring surrounding the excretory part facing part in plan view. In the groove part 11, the surface sheet 2 and the absorber 4 are integrated by thermal fusion or the like. As described above, since the groove portion 11 in which the topsheet 2 and the absorbent body 4 are integrated is formed on the skin contact surface side of the napkin 1, the liquid diffusion in the planar direction of the absorbent body 4 is effective. In addition, the absorber 4 can be prevented from being twisted. The formation of the groove 11 is particularly effective for preventing diffusion of excretory fluid such as menstrual blood and improving adhesion to the body when worn. The groove 11 can be formed according to a conventional method by embossing such as embossing with or without heat, or ultrasonic embossing.

  The material for forming each part in the napkin 1 will be described. As the back sheet 3, various materials conventionally used in the technical field can be used without particular limitation. The back sheet 3 may be liquid-impermeable or liquid-permeable. For example, a resin film that does not have moisture permeability, a resin film that has micropores and has moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, these and other A laminate with a sheet can be used.

As a material constituting the absorbent body 4, various materials conventionally used in the technical field can be used without particular limitation, for example, a fiber assembly made of hydrophilic fibers such as wood pulp and synthetic fiber, or A fiber assembly in which particulate superabsorbent resin is held can be used. The absorbent body 4 includes a liquid-retaining absorbent core (not shown) made of the fiber assembly and the like, and a liquid-permeable core wrap sheet (not shown) that covers the absorbent core. In this case, the absorbent core and the core wrap sheet may be joined to each other by a joining means such as a hot-melt pressure-sensitive adhesive at a predetermined site. As a core wrap sheet which coat | covers an absorptive core, paper, such as tissue paper, various nonwoven fabrics, an apertured film, etc. can be used, for example. The basis weight excluding the middle and high parts of the absorbent body 4 is preferably 100 to 500 g / m ² , more preferably 150 to 300 g / m ² .

  The napkin 1 according to the first embodiment is used by being attached to underwear in the same manner as a sanitary napkin having a known wing part. According to the napkin 1 of the first embodiment, at the time of mounting, the pair of first joining lines 8 arranged on both the left and right sides in the longitudinal direction X of the napkin 1 with the excretory part-facing part sandwiched therebetween are open at the central part B. 71, and the two pairs of second joining lines 9 positioned before and after that form an opening 72 in each of the front part A and the rear part C. Can be captured at the openings 71, 72. Moreover, since the water-repellent treatment is performed on the side sheet covering portion 21 in the central portion B where the opening 71 is formed, bleeding of body fluid in the portion can be suppressed. The napkin 1 according to the first embodiment is unlikely to leak body fluid at the side due to the body fluid capturing effect by the side leakage preventing member 5 (side sheet 6) and the body fluid bleeding preventing effect by the water repellent treatment. .

  Further, the napkin 1 of the first embodiment is such that the water repellent portion (the side sheet covering portion 21 of the central portion B) is applied to the skin through the side sheet 6 that covers the portion by applying printing ink. Since it can be visually recognized from the contact surface 2a side, it is possible to make the user strongly aware of the presence of the portion and to give the user a sense of security with respect to leakage prevention. In addition, since the water-repellent treated portion is colored with printing ink, the stain on the portion is less noticeable, and the body fluid adhering to the portion is concealed, and the user's trouble caused by the adhesion of the body fluid is hidden. Anxiety about pleasure and leakproofness can be reduced.

  Moreover, as for the napkin 1 of 1st Embodiment, the junction part (the 1st joining line 8 and the 2nd joining line 9) with the surface sheet 2 of the side sheet | seat 6 is arcuate in planar view as shown in FIG. Therefore, for example, compared with the case where the joint portion is linear in the longitudinal direction X, twisting of the joint portion between the side sheet 6 and the top sheet 2 can be prevented during mounting, and a good mounting feeling can be obtained. The openings 71 and 72 described above can be easily formed, and the operational effects resulting from the application of the printing ink are excellent.

  Below, other embodiment of the absorbent article of this invention is described with reference to FIGS. In other embodiments to be described later, components different from those of the first embodiment described above will be mainly described, and similar components will be denoted by the same reference numerals and description thereof will be omitted. The description of the first embodiment is appropriately applied to components that are not particularly described.

  The sanitary napkin which is 2nd Embodiment of the absorbent article of this invention is shown by FIGS. In the following, the right side of the napkin will be mainly described based on FIGS. 5 and 6, but the left side is configured in the same manner as the right side unless otherwise specified. The napkin 1 of 2nd Embodiment is provided with a pair of side leak-proof member 12 and 12 arrange | positioned at each of the both sides along the longitudinal direction X of the absorptive main body 10, as shown in FIG.

  As shown in FIGS. 5 and 6, both side edges 2 s and 2 s along the longitudinal direction X of the topsheet 2 are at the same position as both side edges 4 s and 4 s along the longitudinal direction X of the absorbent body 4. It does not exist with the back sheet 3. Here, “both side edges along the longitudinal direction of the surface sheet are in the same position as both side edges along the longitudinal direction of the absorbent body” means that the both side edges 2 s and 2 s of the top sheet 2 are respectively attached to the absorbent body 4. It exists on the surface of the upper layer (skin side layer) when it is divided into the upper layer and the lower layer divided into two in the thickness direction, and the side edge 4s of the absorber 4 (projects most in the width direction Y in the absorber 4). It means the case where it is located within 5 mm along the surface of the absorber 4 from the edge. Thus, when both side portions (both side edges 2s, 2s and their vicinity) along the longitudinal direction of the surface sheet 2 are located at the same positions as both side portions of the absorber 4, the surface sheet 2 as in the first embodiment is formed. Similarly to the case where both side portions along the longitudinal direction extend outward in the width direction of the absorbent body 4, the amount of use of the constituent members of the napkin can be reduced and the manufacturing cost can be reduced.

  As shown in FIGS. 4 and 5, the pair of side leakage preventing members 12, 12 in the second embodiment includes a side sheet 13 that covers the side portion along the longitudinal direction X of the topsheet 2, and the side sheet, respectively. 13 is a so-called three-dimensional gather. As shown in FIG. 4, each side leakage preventing member 12 is provided over the entire length in the longitudinal direction X of the absorbent main body 10, and as shown in FIG. 5, the skin contact surface side of the absorbent main body 10. A base wall portion 15 standing along the longitudinal direction of the absorbent main body 10 and an elastic expansion / contraction portion 16 connected to the upper end portion 15a of the base wall portion 15 and contacting the wearer's skin when worn. It is configured.

  The elastic expansion / contraction part 16 is connected over the full length of the longitudinal direction of the upper end part 15a. An elastic member 14 is provided along the longitudinal direction of the absorbent main body 10 to the elastic stretchable portion 16 to impart elastic stretchability. The expansion / contraction direction of the side leak-proof member 12 (elastic expansion / contraction part 16) coincides with the longitudinal direction of the absorbent main body 10. It is preferable that the elastic member 14 is disposed at least in the central portion B and further extends to the front portion A and / or the rear portion C side.

  The side sheet 13 constituting the side leak-proof member 12 is a sheet having a certain width in the longitudinal direction X, and has a shape in which the elastic stretchable part 16 is continuously provided on the base wall part 15 and its upper end part 15a. It is folded back. Accordingly, the side leakage preventing member 12 formed by folding the side sheet 13 has a two-layer structure in the base wall portion 15 and the elastic stretchable portion 16 as shown in FIG. As shown in FIGS. 5 and 6, the side sheet 13 is joined to the skin contact surface 2 a of the top sheet 2. A lower end portion 15b of the base wall portion 15 is disposed between the absorber 4 and the back sheet 3 and is fixed at the portion by a known joining means such as an adhesive.

  In the second embodiment, as shown in FIG. 5, the elastic stretchable portion 16 projects horizontally from the upper end portion 15 a of the base wall portion 15, and thereby has a planar shape (planar shape in the plan view of the napkin 1). ). That is, the elastic stretchable portion 16 includes an inward elastic stretchable portion 16A that projects substantially horizontally from the upper end portion 15a inward in the width direction Y of the absorbent main body 10, and an elastic stretchable portion 16 in the width direction Y of the absorbent main body 10 from the upper end portion 15a. It is comprised from the outward elastic expansion-contraction part 16B which protrudes outward substantially horizontal, and contacts a wearer's skin at surface shape in the center part B at least. The side edge along the longitudinal direction X of the inward elastic expansion / contraction part 16A is the inner edge part of the side seat 13, and as shown in FIG. 4, the longitudinal direction X is on the center part side in the width direction Y of the napkin 1. It is formed in a straight line extending in the direction.

  One or more elastic members 14 are arranged in each of the inner elastic stretchable portion 16A and the outer elastic stretchable portion 16B to give elastic stretchability. The elastic member 14 is arranged in an extended state between the two layers of side sheets 13 and 13 constituting the inner elastic expansion / contraction part 16A and the outer elastic expansion / contraction part 16B. It is joined to the sheets 13 and 13. As described above, in the second embodiment, the inner elastic expansion / contraction part 16A and the outer elastic expansion / contraction part 16B are integrally formed in a planar shape, and the elastic expansion / contraction part 16 and the base wall part 15 are: As shown in FIG. 5, the side leakage preventing member (three-dimensional gather) 12 has a T shape in a cross-sectional view in the width direction Y.

  In the second embodiment, as shown in FIG. 5, the overhanging widths of the inner elastic stretchable portion 16A and the outer elastic stretchable portion 16B are different, but they may be the same. The ratio of the overhanging width of the inward elastic expansion / contraction part 16A to the overhanging width of the outer elastic expansion / contraction part 16B (the former: the latter) is determined by the fit of the three-dimensional gather to the body and the gathers to the inside of the absorption surface when used. From the viewpoint of preventing the attachment of body fluid due to falling, the ratio is preferably 3: 1 to 1: 3, more preferably 2: 1 to 1: 2. Further, the length from the free end along the longitudinal direction of the inner elastic stretchable portion 16A to the free end along the longitudinal direction of the outward elastic stretchable portion 16B, that is, the width of the planar elastic stretchable portion 16 is the fit. 10-20 mm is preferable from the viewpoint of making the side and the side leakage preventing member 12 difficult to get dirty.

  As shown in FIGS. 4 and 6, the side leak-proof member 12 has an elastic stretchable portion fixing portion 17 in which an elastic stretchable portion 16 is joined to the absorbent main body 10. In the elastic stretchable part fixing part 17, since the standing of the base wall part 15 is inhibited by the elastic stretchable part 16 being joined to the absorbent main body 10, the side leak-proof member (three-dimensional gather) 12 stands up. Not. As shown in FIG. 6, the elastic stretchable portion fixing portion 17 is a surface sheet that constitutes the absorbent main body 10 via a base wall portion 15 in which at least the inner elastic stretchable portion 16 </ b> A of the elastic stretchable portion 16 is folded. It is formed by being fixed to 2.

  As shown in FIG. 4, the elastic expansion / contraction part fixing | fixed part 17 is formed in the both ends of the longitudinal direction X of the side leak-proof member 12 (elastic expansion / contraction part 16), and the center where the said excretion part opposing part exists It is not formed in the longitudinal direction inner part of the side leak-proof member 12 sandwiched between these both ends including the part B. Therefore, the side leak-proof member (three-dimensional gather) 12 does not stand up at both ends in the longitudinal direction where the elastic stretchable part fixing part 17 is formed, and the longitudinal direction where the elastic stretchable part fixing part 17 is not formed. In the inward portion, the elastic member 14 stands up due to the contraction force. Further, due to the contraction of the elastic stretchable part 16, the overall shape in the longitudinal direction of the absorbent main body 10 is curved in a concave shape on the skin contact surface side (surface sheet 2 side).

  In addition, an opening 73 is formed between the standing side leak-proof member 12 and the top sheet 2 and is opened when the seat is mounted. More specifically, as shown in FIG. 5, the side sheet 13 constituting the standing side leak-proof member 12 has an inner edge along the longitudinal direction X (along the longitudinal direction X of the inward elastic stretchable portion 16 </ b> A). It is joined to the skin contact surface 2a of the side part of the surface sheet 2 on the absorber 4 on the outer side in the width direction Y from the side edge), and between the joint part 18 and the inner edge part. An opening 73 is formed that opens when mounted.

  As the side seat | sheet 13 which comprises the side leak-proof member 12, the thing similar to the side seat | sheet 6 in 1st Embodiment can be used. Moreover, as the elastic member 14 which comprises the side leak-proof member 12, the various things conventionally used in the said technical field can be especially used without a restriction | limiting, A thread form or a strip | belt shape may be sufficient.

  In the second embodiment, the water repellent treatment described above is performed on both sides of the top sheet 2 covered with the side sheet 13. That is, as shown in FIGS. 5 and 6, the top sheet 2 includes a portion positioned below the inward elastic stretchable portion 16 </ b> A (the inner edge portion of the side seat 13 and the vicinity thereof), and is wider than the portion. The side part located outside Y is covered with a side sheet 13 to form a side sheet covering part 21, and water repellent treatment is applied to the whole or part of the side sheet covering part 21. It is applied and has water repellency. More specifically, of the side sheet covering portion 21 of the topsheet 2 that extends over the front portion A, the central portion B, and the rear portion C, the side leak-proof member 12 rises to form the opening 73 when mounted. The portion (the portion near the central portion B of the central portion B and the rear portion C) is subjected to the above-described water repellent treatment accompanied by the coloring treatment by applying the printing ink. The water repellent treatment is not performed on the portion where the elastic stretchable portion fixing portion 17 is formed.

  The effect similar to 1st Embodiment is show | played also by the napkin of 2nd Embodiment. That is, according to the napkin of the second embodiment, the body fluid capturing effect (body fluid damming effect) by the side leakage preventing member 12 (side sheet 13) functioning as a so-called three-dimensional gather and the body fluid bleeding preventing effect by the water repellent treatment. Therefore, it is difficult for body fluid to leak from the side. Further, the body leakage due to the side leakage preventing member 12 (three-dimensional gather) falling to the inside of the absorption surface can be prevented during use, and the effect of security given to the appearance is also high. In addition, the water repellent portion (the portion in which the opening 73 is formed at the time of mounting) allows the napkin to be applied from the skin contact surface (skin contact surface 2a of the topsheet 2) side by applying printing ink. Since it is visible when visually observed, it is possible to make the user strongly aware of the presence of the portion and to give the user a sense of security with respect to leakage prevention. In addition, since the water-repellent treated portion is colored with printing ink, the stain on the portion is less noticeable, and the body fluid adhering to the portion is concealed, and the user's trouble caused by the adhesion of the body fluid is hidden. Anxiety about pleasure and leakproofness can be reduced.

  FIG. 7 shows a view corresponding to FIG. 5 of a sanitary napkin which is a third embodiment of the absorbent article of the present invention. In the napkin of the third embodiment, the elastic expansion / contraction part 26 is composed of only an outward elastic expansion / contraction part that protrudes substantially horizontally from the upper end 15a of the base wall part 15 to the outside in the width direction Y of the absorbent main body 10. This is different from the second embodiment. However, the elastic stretchable part 26 in the third embodiment is the same as the elastic stretchable part 16 in the second embodiment in that it is formed in a planar shape. The effect similar to 2nd Embodiment is show | played by the napkin of 3rd Embodiment.

  FIG. 8 is a view corresponding to FIG. 5 of a sanitary napkin that is a fourth embodiment of the absorbent article of the present invention. The napkin of the fourth embodiment is different from the second embodiment in that the elastic stretchable part 36 is not formed in a planar shape. That is, the elastic expansion / contraction part 36 is not substantially formed in the horizontal direction from the upper end part 15a of the base wall part 15 (the extension width is 2 mm or less), and is not formed in a planar shape in the plan view of the napkin. The effect similar to 2nd Embodiment is show | played also by the napkin of 4th Embodiment.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the water repellent treatment is performed only on the skin contact surface and / or the non-skin contact surface of the top sheet 2, but in addition to this, the top sheet 2 in the side sheets 6 and 13. May be provided on the opposite surface (the surface overlapping the surface sheet 2 in a plan view as shown in FIGS. 1 and 4), or may be provided only on the opposite surface of the side sheets 6 and 13. . Moreover, in addition to the center part B including the said excretion part opposing part, the water repellent process may be given to the front part A and / or the rear part C located in the front and back.

  In the second and third embodiments, the side leak-proof member 12 (three-dimensional gather) has the base wall portion 15 and the elastic expansion / contraction portions 16 and 26 integrally formed. The part 15 and the elastic expansion / contraction parts 16 and 26 may be joined and formed.

  Moreover, in the said embodiment, although the sanitary napkin was mentioned as one of the application examples of the absorbent article of this invention, For example, it can apply also to a disposable diaper, a panty liner (orimono sheet), an incontinence pad, etc.

1 Sanitary napkin (absorbent article)
2 Surface sheet 2 a Skin contact surface 3 of the surface sheet Back sheet 4 Absorbers 5, 12 Side leakage preventing members 6, 13 Side sheet 7 Wing portion 8 First joint line 9 Second joint line 10 Absorbent body 14 Elastic member 15 Base wall parts 16, 26, 36 Elastic elastic part 16A Inward elastic elastic part (inner edge of side seat)
16B Outer elastic expansion / contraction part 17 Elastic expansion / contraction part fixing | fixed part 21 Side sheet coating | coated part 61 of a surface sheet Inner edge 71,72,73 of a side sheet Opening part A Front part B Center part C Back part X Napkin longitudinal direction Y Napkin width direction

Claims (2)

A substantially vertically long absorbent main body having a liquid retaining absorbent body and a surface sheet disposed on the skin contact surface side of the absorbent body, and disposed on both sides along the longitudinal direction of the absorbent main body. An absorbent article comprising a pair of side leakage preventing members,
Both side edges along the longitudinal direction of the surface sheet are located at the same position as both side edges along the longitudinal direction of the absorbent body, or are located more outward in the width direction than both side edges along the longitudinal direction of the absorbent body. And
Each of the pair of side leakage preventing members includes a side sheet that covers a side portion along the longitudinal direction of the top sheet,
At least a part of the side sheet is joined to the side part of the topsheet in the width direction outside of the inner edge part along the longitudinal direction, and between the joint part and the inner edge part. , An opening is formed in which the inner edge stands up when installed and opens inward;
Water repellent treatment is performed on both sides of the top sheet that are covered with the side sheet and / or the surface of the side sheet that faces the top sheet. The absorbent article which is provided and is made visible when the absorbent article is viewed from the skin contact surface side.   The part to which the said water-repellent process was performed exists in the longitudinal direction left and right both sides of this absorbent article on both sides of the excretion part opposing part which opposes the excretion part of the wearer of the said absorbent article. Absorbent articles.

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