JP2009201848A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which is simply structured and easily manufactured as well even while achieving adhesion to the crotch and a leakage preventing performance to sudden excretion. <P>SOLUTION: The absorbent article 100 is provided with a bonding means 30 for bonding the back surface of the part on the center part side in a left side part 21 and the back surface of the part on the left side in a center part 23 among the left side part 21, a right side part 22 and the center part 23 positioned between them in a cross direction intermediate area 20, and a bonding means 30 for bonding the back surface of the part on the center part side in the right side part 22 and the back surface of the part on the right side in the center part 23. Also, the left side part, the right side part and the center part are the parts provided with a liquid permeable top sheet, a back sheet 1 and an absorbent body 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article, such as a disposable diaper, an absorbent pad, and a sanitary napkin, which is worn on the body so as to cover the crotch.

In recent years, the adhesion of absorbent articles to the crotch has been improved to prevent transmission leakage, and when a liquid with a viscosity is rapidly excreted (typically urination, when excreted in a certain amount and a certain amount of time earlier) ) Has been proposed as an absorbent article having a structure that can be absorbed without leakage.
JP 2007-330383 A

However, this absorbent article has an upper surface on the top sheet of the first absorbent part (which corresponds to an absorbent article having a general structure) having a first absorbent body between the top sheet and the back sheet. The second absorbent part with the second absorbent body interposed between the sheet and the lower surface sheet is floated and attached. Since the second absorbent part is formed as a separate body, the structure is complicated. And, therefore, the manufacturing process becomes complicated and the manufacturing cost increases.
Therefore, the main problem of the present invention is to propose an absorbent article that has a simple structure and is easy to manufacture, while achieving both adhesion to the crotch and leakage prevention performance against rapid excretion.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In the absorbent article which has a liquid-permeable top sheet, a back sheet, and an absorbent body interposed between these, and is mounted so as to cover the crotch,
Among the left and right side portions in the front-rear direction intermediate region, and the central portion located between them, a joining means for joining the back surface of the central portion side portion of the left portion and the back surface of the left portion of the central portion, While having a joining means for joining the back surface of the central portion side portion in the right portion and the back surface of the right portion in the central portion,
The left part, the right part and the central part are the parts having the liquid-permeable top sheet, the back sheet and the absorber,
An absorbent article characterized by that.

(Function and effect)
In the absorbent article of the present invention, in use or in a product state in advance, the left side part is folded to the back side of the central part with the boundary with the central part as a fold, and the back side of the central part side part in the left side part and the left side part in the central part Join the back of the part, and similarly, fold the right side to the back of the center with the boundary with the center as the crease, and the back of the center on the right and the back of the right on the center At the same time, the non-joined part with the center part on the left side is folded back to the back side of the joined part with the boundary with the joint part (the part on the center part side) as the crease. By folding the part back to the back side of the joint part with the boundary with the joint part (part on the center part side) as a crease, the center part can be lifted to the crotch side with respect to the left side part and the right side part.

  Therefore, in the absorbent article of the present invention, the back surface of the left side and right side abuts on the inner surface of an outer such as underwear, and the central part is pushed out to the body side in a form supported by these, and the central part adheres between the crotch As a result, the excretion fluid from the crotch is immediately absorbed in the central portion, and transmission leakage is prevented. In addition, the left side and the right side located on both sides of the central part are separated by one step outside the central part, so that the excretion liquid that cannot be absorbed by the central part for sudden excretion is left from the central part. And after being released into the space between the right side and the body, it is absorbed by the left and right side absorbers.

  In addition, it should be noted that the absorbent article of the present invention has a very simple structure and includes a joining step of the joining means because it is only necessary to provide a joining means at a predetermined site with respect to the existing absorbent article. However, manufacturing becomes much easier.

<Invention of Claim 2>
2. The absorbent body according to claim 1, wherein at least in the front-rear direction intermediate region, a portion located on the left side portion, a portion located on the center portion, and a portion located on the right side portion are separated in the width direction. Absorbent articles.

(Function and effect)
When the absorber is separated as described above, the central portion is easily lifted with respect to the left side portion and the right side portion, and the left side portion and the right side portion are easily placed at a predetermined position with respect to the central portion when the joining means is joined. You can wrap it.

<Invention of Claim 3>
The absorption pad according to claim 1, wherein a through-hole penetrating in the front and back direction is formed in a portion located in the central portion of the absorbent body.

(Function and effect)
Since the central part of the present invention has high adhesion to the crotch, if the rate of accepting the excretory fluid is slow, there is no possibility that the excretory fluid escapes during rapid excretion, leading to leakage and discomfort. Therefore, it is preferable to provide a through hole as described in this section to improve the excretion fluid receiving speed.

<Invention of Claim 4>
The absorbent article according to any one of claims 1 to 3, wherein an elastic elastic member is fixed to the back surface of the top sheet or the surface of the absorber in the central portion in a state of being stretched along the front-rear direction.

(Function and effect)
With such a structure, the portion on the top sheet side in the central portion contracts in the front-rear direction along with the elastic elastic member, so that the central portion is elastic to the crotch side with respect to the left side portion and the right side portion. Uplift. Therefore, the adhesiveness to the crotch of the central part is further improved.

  As described above, according to the present invention, there are advantages such as having a simple structure and facilitating manufacture while achieving both the adhesion to the crotch and the leakage prevention performance against rapid excretion.

  Hereinafter, although an example of a tape type disposable diaper is drawn and explained about one embodiment of the present invention, the present invention is applicable also to other absorptive articles, such as an absorption pad with which a diaper and an underwear inner surface are equipped.

(About tape-type disposable diapers)
1 to 6 show an example 100 of a tape-type disposable diaper according to the present invention. The disposable diaper 100 is formed between an inner surface of a back sheet 1 and a liquid-permeable top sheet 2 with an absorbent body 3. Is interposed. The crotch portion C means a portion corresponding to the crotch of the body at the time of use, and in most products, it is a central portion in the front-rear direction and a portion in the vicinity of the front and rear. Specifically, in the case of an absorbent article for adults, the range is ± 150 mm with respect to the center in the front-rear direction of the product. Further, the ventral part (front part) F means a part on the front side of the crotch part C, and the back part (rear part) B means a part on the rear side of the crotch part C.

As the back sheet 1, in addition to a polyethylene film, a sheet having moisture permeability can be used without impairing water shielding from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used. The weight per unit area of the backsheet 1 is preferably 13 to 40 g / m ² , and the thickness is preferably 0.01 to 0.1 mm.

As the liquid-permeable top sheet 2, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. The basis weight of the nonwoven fabric used for the liquid-permeable top sheet 2 is preferably 15 to 30 g / m ² , and the thickness is preferably 0.05 to 1 mm.

As the absorbent body 3, it is possible to use a laminate of pulp fibers, an aggregate of filaments such as cellulose acetate, or a nonwoven fabric, and a mixture obtained by mixing and fixing a superabsorbent polymer as necessary. . Moreover, the absorber 3 can be wrapped with crepe paper (not shown) as needed. Moreover, the shape of the absorber 3 can be determined as appropriate, but in addition to the hourglass shape as illustrated, a shape that extends from the front side to the rear side of the crotch portion, such as a rectangle, is preferable. It is desirable that the basis weight of the absorbent 4 is about 100 to 500 g / m ² and the thickness is about 1 to 15 mm. The basis weight of the highly water-absorbent resin is preferably about 0 to 300 g / m ² . If the content of the superabsorbent resin is too small, sufficient absorbability cannot be provided, and if it is too large, the entanglement between the pulp fibers is lost, and twisting or cracking is likely to occur.

  The backsheet 1 extends outward from the periphery of the absorbent body 3 and has an hourglass shape having constricted portions along the periphery of the legs on both side edges. On the inner surface of the laterally extending portion of the backsheet 1, a portion 4x on the outer side in the width direction of the barrier sheet 4 is attached over the entire front-rear direction to constitute a side flap portion SF where the absorber 3 does not exist. A portion 4c on the center side in the width direction of the barrier sheet 4 extends to the top sheet 2, and an elongated elastic member 4G is stretched along the front-rear direction at the end on the center side in the width direction. It is fixed with a melt adhesive or the like. As the elongated elastic member 4G and the elongated elastic member 13 described later, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene formed in a thread shape, a string shape, a belt shape, or the like. Commonly used materials such as styrene butadiene, silicon, and polyester can be used.

  The liquid-permeable top sheet 2 has an hourglass shape that is slightly larger than the absorbent body 3, and a portion that extends slightly outward from the side edge of the absorbent body 3 is a hot melt adhesive between the barrier sheet 4 and the back sheet 1. And so on. This fixed portion is shown as a dot pattern in FIGS. As the material of the barrier sheet 4, a plastic sheet or a melt blown nonwoven fabric can be used. However, in terms of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.

  When the outer surface of the backsheet 1 is covered with a nonwoven fabric, the outer nonwoven fabric is extended outward from the periphery of the absorber 3 in place of the backsheet 1 and the absorber 8 is not present together with the side portion of the barrier sheet 4. The side flap part SF can also be configured. In this case, the backsheet 1 can be formed in the same shape as the topsheet 2 without extending to the side flap portion SF.

  As shown in FIGS. 3 and 4, both barrier sheets 4, 4 are not attached to and detached from the inner surface of the article (the top sheet 2 surface and the back sheet 1 inner surface in the illustrated embodiment) in the widthwise outer portion 4 x throughout the entire front-rear direction. The portion 4c on the center side in the width direction is fixed so as not to be attached to and detached from the inner surface of the article (the surface of the top sheet 2 in the illustrated embodiment) at both ends in the front-rear direction, and between the both ends in the front-rear direction. It is not fixed to the inner surface (the top sheet 2 surface in the illustrated form). As shown in FIG. 4, the non-fixed portion is a portion that becomes a barrier portion that can stand up with respect to the inner surface of the article (the surface of the top sheet 2 in the illustrated embodiment), and the standing base end 4 b has a width in the barrier sheet 4. It is located at the boundary between the fixed portion 4x on the outer side in the direction and the inner portion 4c.

  At both ends in the front-rear direction of the disposable diaper 100, the back sheet 1 and the liquid-permeable top sheet 2 are extended to the front and rear sides from the front and rear ends of the absorbent body 3, respectively, and end flap portions EF in which the absorbent body 3 does not exist are formed. Of these, in the end flap portion EF on the back side, a plurality of, in the illustrated example, three thread-like elastic members 7, 7... Are arranged along the width direction. As the thread-like elastic member 7, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester that are usually used can be used.

  In addition, the fastening tapes 5 and 5 are attached to both side flap portions SF in the waistline portion of the back side B1 so as to protrude sideways, and in the width direction on the waistline surface of the stomach side F1 of the disposable diaper 100. A front target tape 6 is attached along the front target tape 6, and the disposable diaper 100 is attached to the body by fastening the joining piece 8 a of the fastening tape 5 to the front target tape 6.

The fastening tape 5 in the illustrated example is attached by attaching the inner end side of one fastening base sheet 8 to the disposable diaper 100 side, and extends from the outer edge to the tip side and is laterally extended in two steps. Projecting joining pieces 8a, 8a are formed, and a perforation 10 is provided from the outer edge toward the inside and along the horizontal direction with respect to the fastening base sheet 8 portion between the joining pieces 8a, 8a. However, the present invention is not limited to this, and a known fastening tape can be used. Although various sheet materials can be used as the fastening base sheet 8, it is preferable to use a single-layer or multi-layer nonwoven fabric having a basis weight of 40 to 80 g / m ² . The processing method is preferably spunbond having excellent strength characteristics. On the inner surface side (liquid permeable surface sheet 2 side) of the joining pieces 8a and 8a, hook tapes (male materials of mechanical fasteners) 9 and 9 each having a large number of hook-shaped protrusions are attached, and the hook-shaped protrusions can be attached and detached. It can be joined to a front target tape (female material of a mechanical fastener) 6 having a surface that is hooked to the front.

  Characteristically, among the left side portion 21, the right side portion 22, and the central portion 23 located between them in the front-rear direction intermediate region 20, the back surface of the portion on the central portion 23 side in the left side portion 21 and the left side in the central portion 23. And a joining means 30 for joining the back surface of the right side portion 22 and the back surface of the right portion of the central portion 23 to each other. Further, the left side portion 21, the right side portion 22, and the central portion 23 are portions having the liquid permeable top sheet 2, the back sheet 1, and the absorber 3.

  The dimensions of each part can be appropriately determined according to the product size, product type, etc. For example, the front-rear direction intermediate region 20 is a region extending from the abdominal part F through the crotch part C to the back part B. Although it is preferable, there may be a region including only the crotch portion C. Specifically, in the case of an absorbent article for adults, the front-rear direction intermediate region 20 is a range from a position of 40 to 400 mm on the front side to a position of 40 to 400 mm on the rear side with reference to the center in the front-rear direction of the product. Moreover, it is preferable to determine the center part 23 according to a wearer's crotch width, and it is preferable to set it as the width | variety of about 40-500 mm in the case of the absorbent article for adults. On the other hand, since the width of the left side portion 21 and the right side portion 22 is a portion that forms a space for temporarily storing excretory fluid, it is preferable to determine the dimensions from the viewpoint of securing the space. The width is preferably about 50 to 400 mm.

  As the joining means 30, in addition to means for releasably joining such as an adhesive, an adhesive tape, and a hook-and-loop fastener, means for joining such as an adhesive and adhesive tape that cannot be peeled can also be used. The illustrated example assumes a form in which the pressure-sensitive adhesive layer is formed by coating. However, in the form in which an exterior sheet (not shown) is attached to the outer surface of the back sheet 1, a male tape of a hook-and-loop fastener may be used as the joining means. . The joining means can be provided continuously in the front-rear direction as in the illustrated example, or can be provided intermittently (dotted line) in the front-rear direction.

  The position where the joining means 30 is provided may be determined as appropriate. In the illustrated example, the joining means 30 is provided only on the back surface of the left side portion 21 and the right side portion 22 on the central portion 23 side, but instead of or together with this, the back surface and right side of the left side portion of the central portion 23 are provided. You may provide the joining means 30 in the back surface of a part. In the case of the joining means 30 that functions independently like an adhesive layer, it is preferable to provide it only in any one of these joining portions. When joining with a male tape and a female tape of a hook-and-loop fastener, the male tape is provided at one of the joining portions and the female tape is provided at the other.

  The width of the joining portion by the joining means 30 can be determined as appropriate, but if it is too narrow, the liftability of the central portion 23 will be inferior, and if it is too wide, only the width of the folded portion will be widened. From this point of view, the width of the joined portion by the joining means 30 is preferably about 100 ± 90 mm with respect to the apparent thickness of the central portion 23, and is usually about 20 to 100 mm.

  In the disposable diaper thus configured, the left side portion 21 of the figure is folded to the back side of the central portion 23 with the boundary with the central portion 23 as a fold, and the back side portion of the left side portion 21 and the left side portion of the central portion 23 Similarly, the right side portion 22 is folded to the back side of the central portion 23 with the boundary with the central portion 23 as a fold, and the back side of the right side portion 22 on the central portion 23 side and the right side portion of the central portion 23 are While joining the back surface of a part, the non-joining part with the center part 23 in the left side part 21 is turned back to the back side of a joining part by making the boundary with a joining part (part by the side of the center part 23) into a crease, By folding back the non-joining portion of the portion 22 with the central portion 23 to the back side of the joining portion with the boundary with the joining portion (the portion on the central portion 23 side) as the fold, It can be lifted to the crotch side against the side 22.

  The so-called medium-high shape in which the central portion 23 is lifted can be formed by the user as needed when used, or can be formed in a product state in advance. Even in the latter case, by making the bonding means 30 peelable, the bonding means 30 can be peeled off as necessary when the user uses it, and the medium-high shape can be changed to a flatter shape without folding.

  Therefore, the back surfaces of the left side portion 21 and the right side portion 22 come into contact with the inner surface of an outer such as underwear, and the central portion 23 is pushed out to the body side in a form supported by these, so that the central portion 23 comes into close contact with the crotch. The excretion fluid from the crotch is immediately absorbed by the central portion 23, and transmission leakage is prevented. Moreover, since the left side part 21 and the right side part 22 which are located on both sides of the central part 23 are separated from the central part 23 by one step outside, the excretion liquid that cannot be absorbed by the central part 23 for sudden excretion is generated. After being escaped from the central portion 23 to the space between the left side portion 21 and the right side portion 22 and the body, it is absorbed by the absorber 3 of the left side portion 21 and the right side portion 22.

  On the other hand, the absorbent body 3 may be continuous in the width direction from the left side portion 21 to the right side portion 22, but in that case, the central portion 23 is difficult to lift with respect to the left side portion 21 and the right side portion 22. Therefore, as in the illustrated example, at least in the front-rear direction intermediate region 20, the absorber 3 is separated in the width direction into a portion located on the left side portion 21, a portion located on the central portion 23, and a portion located on the right side portion 22. It is preferable. Such a separation structure may be formed by an appropriate method. However, as shown in the illustrated example, the separation structure is continuous to both the front and rear sides of the intermediate region 20 in the front-rear direction, and from the position corresponding to the left side portion 21 in the width direction from the right side portion. The slits 40 are respectively formed at the boundaries between the central portion 23, the left side portion 21 and the right side portion 22 with respect to the integral absorbent body 3 which continues to the position corresponding to 22, and each portion is separated by these slits. One preferred form. Of course, it is also a preferable form that the whole absorber located in each part 21-23 is mutually separated (that is, three absorbers are arranged in parallel). When the slit 40 is provided, the position thereof is preferably the boundary between the central portion 23 and the left and right side portions 21 and 22 or the vicinity thereof.

  When the absorber 3 has such a separation structure, the center portion 23 is easily lifted with respect to the left side portion 21 and the right side portion 22 as shown in FIG. Further, when the joining means 30 is joined, the left side portion 21 and the right side portion 22 can be easily folded back at a predetermined position with respect to the central portion 23.

  On the other hand, since the central portion 23 has high adhesion to the crotch, if the receiving speed of the excretory fluid is slow, there is no possibility of the excretory fluid to escape during rapid excretion, which may lead to leakage or discomfort. Therefore, as shown in FIG. 8 and FIG. 9, a through hole 50 that penetrates in the front and back direction is formed in the portion located in the central portion 23 of the absorbent body 3, and the excretion liquid receiving speed in the central portion 23 is improved. Is preferred.

The size and number of the through holes 50 may be determined as appropriate, but the through holes 50 are preferably cylindrical with a cross-sectional area of 3 mm ² or more, and 9 to 81 are formed per 3 cm square of the central portion 23. Is preferred. The formation region of the through hole 50 can also be determined as appropriate, and can be the entire central portion 23, but can also be a part. In a normal case, the through hole 50 preferably occupies an area of about 3 to 80% with respect to the area of the central portion 23. The arrangement of the through holes 50 when viewed in a plan view may be irregular, but is preferably provided regularly. In particular, a staggered arrangement as in the illustrated example or a matrix arrangement (not shown) is provided. preferable.

  Also, as shown in FIGS. 8 and 9, in order to improve the adhesion of the central portion 23 to the crotch, elastic elastic members 60 are arranged on the back surface of the top sheet 2 or the surface of the absorber 3 in the central portion 23. It is also a preferred form to fix in a stretched state along the direction. With such a structure, as a result of the portion on the top sheet 2 side in the central portion 23 contracting in the front-rear direction along with the elastic elastic member 60, the central portion 23 is against the left side portion 21 and the right side portion 22. It rises elastically on the crotch side. Therefore, the adhesiveness to the crotch of the center part 23 becomes much more.

  The position of the elastic expansion / contraction member 60 may be determined as appropriate, and may be provided at the center in the width direction of the central portion 23, but is preferably provided at least along both side edges of the central portion 23. As the elastic elastic member 60, natural rubber, synthetic rubber, foamed resin, or the like formed in an elongated shape such as a thread shape, a string shape, or a belt shape can be suitably used. When using synthetic thread rubber, it is preferable to fix one having a thickness of about 570 to 1640 dtex in a stretched state to 120 to 350%. The elastic expansion / contraction member 60 is provided so that the contraction force acts only in the intermediate region 20, such as being provided only in the intermediate region 20, or being fixed only in the intermediate region 20 and not fixing the other parts. However, as in the illustrated example, the contraction force acts from the intermediate region 20 to the outside of the intermediate region 20 such as by continuously providing from the inside of the intermediate region 20 to the outside of at least one of the front side and the rear side of the intermediate region 20. When provided, the entire front and rear direction of the intermediate region 20 is effectively raised, which is preferable.

  The present invention can be applied to a wide range of uses such as a disposable diaper such as a tape type or a pants type, a sanitary napkin, a panty liner, a cage sheet, and an incontinence pad.

It is a top view which shows the inner surface side of the expansion | deployment state of a tape-type disposable diaper. It is VV sectional drawing of FIG. It is XX sectional drawing of FIG. It is WW sectional drawing of FIG. It is a principal part enlarged plan view. It is a top view which shows the outer surface side of the expansion | deployment state of a tape-type disposable diaper. It is sectional drawing in the middle-high state at the time of use. It is a top view which shows the inner surface side of the expansion | deployment state of another tape type disposable diaper. It is YY sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Back sheet, 2 ... Liquid-permeable top sheet, 3 ... Absorber, 4 ... Barrier sheet, 5 ... Fastening tape, 6 ... Target tape, 7 ... Elastic member, 8 ... Base material sheet, 9 ... Hook tape, 10 DESCRIPTION OF SYMBOLS Perforation, 20 ... Middle area | region, 21 ... Left side part, 22 ... Right side part, 23 ... Center part, 30 ... Joining means, 40 ... Slit, 50 ... Through-hole, 60 ... Elastic elastic member, 100 ... Tape type disposable diaper .

Claims (4)

In the absorbent article which has a liquid-permeable top sheet, a back sheet, and an absorbent body interposed between these, and is mounted so as to cover the crotch,
Among the left and right side portions in the front-rear direction intermediate region, and the central portion located between them, a joining means for joining the back surface of the central portion side portion of the left portion and the back surface of the left portion of the central portion, While having a joining means for joining the back surface of the central portion side portion in the right portion and the back surface of the right portion in the central portion,
The left part, the right part and the central part are the parts having the liquid-permeable top sheet, the back sheet and the absorber,
An absorbent article characterized by that.   2. The absorbent body according to claim 1, wherein at least in the front-rear direction intermediate region, a portion located on the left side portion, a portion located on the center portion, and a portion located on the right side portion are separated in the width direction. Absorbent articles.   The absorption pad according to claim 1, wherein a through-hole penetrating in the front and back direction is formed in a portion located in the central portion of the absorbent body.   The absorbent article according to any one of claims 1 to 3, wherein an elastic elastic member is fixed to the back surface of the top sheet or the surface of the absorber in the central portion in a state of being stretched along the front-rear direction.

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