JP2006110058A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article provided with an absorbing medium which is thin and does not become voluminous even after excretion. <P>SOLUTION: An article body of the absorbent article is composed of at least a top sheet which is arranged on the skin-contacting side, a back sheet which is arranged on the outer surface and the absorbing medium which is interposed between these sheets and is composed of at least water-insoluble fibers. In this case, the absorbing medium is combined with water-soluble fibers. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an absorbent article such as a disposable paper diaper, a disposable swimsuit, a urine picking pad, and a sanitary napkin, and more particularly to an absorbent article that can be discarded without being bulky and has a good appearance when worn.

  Absorbent articles, such as disposable paper diapers, are disposed at least on the skin contact surface side, and are a top sheet made of nonwoven fabric and the like, and a back sheet that is placed on the outer surface side and is made of a plastic sheet such as polyethylene, nonwoven fabric, or a combination thereof. A paper diaper main body having a planar shape formed into an hourglass shape is constituted by an absorbent body interposed between the two sheets and entirely covered with a water absorbent paper such as a tissue.

  In recent years, such a disposable diaper has been required to be thin and compact from the viewpoint of carrying convenience and feeling of attachment, and further from the viewpoint of efficiency of distribution and resource saving. Thinning is required. However, if the thickness of the absorbent body is reduced, the amount of water-insoluble fibers such as cotton pulp used in the absorbent body must be reduced at the same time. There was a problem that occurred.

  In order to solve such a problem, for example, as shown in Patent Document 1, an absorbent article using an absorbent body in which a high water-absorbent resin is blended at a high rate of 50 to 95% in a water-insoluble fiber is proposed. Has been. In this way, when a high water-absorbent resin is blended in the absorbent body at a high rate, the thickness of the absorbent body before use can be reduced, and the absorbent article can be made thinner and more compact. In addition, it will be excellent in logistics efficiency. Even if the thickness of the absorber before use is reduced, the superabsorbent resin absorbs a large amount of body fluid such as urine, so that the amount of body fluid absorbed by the absorber can be maintained or increased.

  In addition, the superabsorbent resin becomes a gel when it absorbs water, and once it absorbs water, it is difficult to release water even if some pressure is applied. Therefore, an absorbent body containing a high percentage of superabsorbent resin also has excellent body fluid retention. .

  However, the highly water-absorbent resin also has a characteristic that when it absorbs water, it swells from several times to several thousand times its own volume. Therefore, when an absorbent body containing a high percentage of a superabsorbent resin is used in a paper diaper, it has the above-mentioned advantages, but excreted, and body fluids (especially urine and loose stool moisture) are superabsorbent resins. When water is absorbed, the highly water-absorbent resin swells and the thickness of the absorber increases, which increases the thickness of the paper diaper and causes a problem of bulkiness.

  When the thickness of the absorbent body increases and becomes bulky in this way, there is a problem in that the appearance of the wearer is not refreshed when worn and the appearance is deteriorated, and the wearer feels irritated and reduces the wearing feeling. It was.

  In addition, if the absorbent body is bulky, the used paper diaper cannot be folded in a compact manner at the time of disposal, and thus the dust cannot be reduced. For this reason, it is necessary to secure a large space for storing used paper diapers, particularly in places where the amount of used paper diapers is large, such as nursing homes and hospitals.

  Further, since the proportion of the superabsorbent resin in the absorbent body increases as the superabsorbent resin swells, there are no voids in the absorbent body. Therefore, the diffusibility of the body fluid is lowered and the absorption rate of the body fluid is lowered, so that the absorption capacity of the absorber is lowered.

  Furthermore, since the swollen superabsorbent resin is soft, it may be crushed when pressure is applied, and the superabsorbent resins in the vicinity may come into contact with each other (stick), thereby causing a so-called gel block. When gel block occurs in the absorbent body, the void volume in the absorbent body is reduced, so that the diffusibility of the body fluid is lowered, the absorption speed of the body fluid is lowered, and the absorption capacity of the absorbent body is lowered. For this reason, there was a problem that body fluid reverts on the top sheet or water is retained on the top sheet, resulting in leakage of body fluid.

In addition, the superabsorbent resin can absorb a large amount of body fluid when viewed as a single substance, and can improve the amount of body fluid absorbed by the absorber, but cannot absorb body fluid unless it is moistened to some extent. The initial absorption rate of body fluid is slow. Therefore, normally, the water-insoluble fibers constituting the absorber are blended in the form of, for example, granular powder, crushed powder, or pellets. In particular, since the blending ratio of the water-insoluble fiber is low, the initial absorption capacity of the body fluid is low. For this reason, there has been a problem that the body fluid retains water on the top sheet or the body fluid returns to the top sheet.
JP 2003-190211 A

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an absorbent article including an absorbent body that is thin and does not bulk even when excreted. It is in.

  The object of the present invention is to absorb at least a top sheet disposed on the skin contact surface side, a back sheet disposed on the outer surface side, and at least water-insoluble fibers interposed between the two sheets. This is achieved by providing an absorbent article comprising an article main body constituted by a body, wherein the absorbent article contains water-soluble fibers.

  Moreover, the said objective of this invention is achieved effectively by providing the absorbent article characterized by the superabsorbent resin being mix | blended with the said absorber.

  Moreover, the said objective of this invention is achieved effectively by providing the absorbent article characterized by the said water-soluble fiber having a dissolution rate of 10 g / min or more.

  The above-mentioned object of the present invention can be achieved more effectively by providing an absorbent article characterized in that the absorbent body contains 20% or more and less than 100% of the water-soluble fiber. .

  Further, the object of the present invention is that when the absorber is divided into a surface layer portion, a middle layer portion, and a lower layer portion in the thickness direction, the water-soluble fiber is 40% or more and 70% or less in the surface layer portion, This is achieved even more effectively by providing an absorbent article characterized in that it is blended in the middle layer portion to 30% to 60% and in the lower layer portion from 0% to 30%.

  Furthermore, the above-mentioned object of the present invention is that the water-soluble fiber is blended at 40% or more and 100% or less at the central portion in the longitudinal direction of the absorbent body, and 0% or more and 30% or less at both ends. This is achieved even more effectively by providing the absorbent article that is characterized.

  The object of the present invention is to absorb at least a top sheet disposed on the skin contact surface side, a back sheet disposed on the outer surface side, and at least water-insoluble fibers interposed between the two sheets. An absorbent article comprising a body and an article body, wherein at least one web-like sheet containing water-soluble fibers is intermittently disposed inside the absorbent body. This is achieved by providing a sex article.

  The object of the present invention is to absorb at least a top sheet disposed on the skin contact surface side, a back sheet disposed on the outer surface side, and at least water-insoluble fibers interposed between the two sheets. An absorbent article comprising an article body constituted by a body, wherein a web-like sheet in which water-soluble fibers are blended is provided on the skin contact surface side and / or the lower surface side of the absorbent body. This is accomplished by providing an absorbent article.

  In addition, the object of the present invention is to provide an absorbent article characterized in that a web-like sheet in which water-soluble fibers are blended is provided on the skin contact surface side and / or the lower surface side of the absorbent body. Can be effectively achieved.

  The above-mentioned object of the present invention can be achieved more effectively by providing an absorbent article characterized in that the absorbent body contains water-soluble fibers and / or a superabsorbent resin. The

  According to the absorbent article according to the present invention, since water-soluble fibers are blended in the absorber, there is excretion, and when the body fluid is absorbed by the absorber, the water-soluble fibers are dissolved. Therefore, since the volume of the absorbent body after excretion can be reduced and the thickness of the absorbent body can be kept thin, the appearance at the time of wearing is refreshed and the appearance is improved even after the excretion.

  In addition, even after excretion, the thickness of the absorbent body can be kept thin, so that it does not become bulky, and when the absorbent article is discarded, the used absorbent article can be folded compactly, Can be reduced.

  Moreover, even if a highly water-absorbent resin swells due to excretion, an absorbent containing water-soluble fibers has a void at the position where the water-soluble fibers are dissolved immediately after excretion. Therefore, since a space | gap can be maintained in an absorber, the diffusibility of a bodily fluid does not fall, and the fall of the absorption capacity of an absorber can be prevented.

  Moreover, since the water-soluble fiber used in the present invention has a dissolution rate of 10 g / min or more, it is dissolved before the next urination.

  In addition, by mixing 20% or more and less than 100% of water-soluble fiber in the absorbent body, there is excretion, body fluid is absorbed into the absorbent body, and the volume of voids formed by dissolving the water-soluble fiber is a certain size. Since it can be set as the above, the thickness of an absorber can be made thin reliably.

  Further, when the absorbent body is divided into the surface layer portion, the middle layer portion, and the lower layer portion in the thickness direction, the blending ratio of the water-soluble fibers is lowered in the order in which the body fluid passes, that is, more water is added to the surface layer portion. By blending the conductive fiber, the absorption capacity of the absorber can be further improved.

  Moreover, the absorption capability of an absorber can be further improved by mix | blending more water-soluble fiber with the center part in the longitudinal direction of an absorber, ie, the vicinity of the position where excretion concentrates.

  According to the absorbent article of the present invention, since at least one web-like sheet in which water-soluble fibers are blended in the absorbent body is disposed intermittently, there is excretion, and the body fluid is web-like. When absorbed by the sheet, the water-soluble fibers of the web-like sheet are dissolved, and the volume of the absorbent body is reduced. Therefore, the thickness of the absorber is reduced and the bulk is not increased.

  According to the absorbent article of the present invention, since the web-like sheet containing water-soluble fibers is provided on the skin contact surface side and / or the lower surface side of the absorbent body, there is excretion and the body fluid is web-like. When absorbed in the sheet, the water-soluble fibers are dissolved, and the volume of the web-like sheet is reduced. Accordingly, the thickness of the absorbent article is reduced, and the absorbent article is not bulky.

  According to the absorbent article according to the present invention, the water-soluble fiber is blended on the skin contact surface side and / or the lower surface side of the absorbent body in which the web-like sheet blended with the water-soluble fiber is disposed. By providing the web-like sheet, the thickness of the absorbent body can be made thinner and less bulky, and the diffusibility of body fluid can be improved, so that the absorbent capacity of the absorbent body can be improved.

  Hereinafter, the absorbent article according to the present invention will be described in detail with reference to the drawings, taking as an example the case where the absorbent article is a tape-type paper diaper. The present invention is not necessarily limited to the following examples, and it is needless to say that the configuration can be appropriately changed without departing from the scope of the claims.

  FIG. 1 is a view of a tape-type paper diaper (hereinafter referred to as “book diaper”) 10 according to the present invention as viewed from the skin contact surface side, and FIG. 2 is a cross-sectional view taken along line XX in FIG. FIG. In addition, as this paper diaper 10 mentions later, other structures except the structure of an absorber are substantially the same as the conventional paper diaper mentioned above.

  That is, the present paper diaper 10 is arranged at least on the skin contact surface side as in the conventional paper diaper described above as shown in the drawing, and is disposed on the outer surface side with a top sheet 11 made of nonwoven fabric or the like, and a plastic sheet such as polyethylene And a non-woven fabric, or a back sheet 12 made of a combination of these, and an absorbent body 14 interposed between the two sheets 11 and 12 and entirely covered with a water absorbent paper 13 such as a crepe paper. A diaper main body 15 is formed. As shown in the figure, when the absorbent body 14 is covered with the water absorbent paper 13, body fluid such as urine (hereinafter referred to as “body fluid”) is quickly diffused in the absorbent body 14, and the body fluid returns to the top sheet 11. This water-absorbing paper 13 can be omitted as appropriate.

  In the present paper diaper 10, a second sheet 16 is disposed between the top sheet 11 and the absorber 14, and a waterproof film 17 is disposed between the absorber 14 and the back sheet 12. The second sheet 16 and the waterproof film 17 can be omitted as appropriate.

  Further, in the longitudinal direction of both side edges of the absorbent body 14, a three-dimensional gathered sheet 18 made of nonwoven fabric or the like provided on the skin contact surface side, and a plurality of yarns made of thread rubber or the like disposed along the inner edge. A three-dimensional gather 10BS that stands on the skin contact surface side is formed by the elastic elastic member 19.

  Furthermore, a fastening tape 22 having a hook tape 20 is connected to left and right overhanging portions at the back side position 10BP of the diaper main body 15, that is, to the widthwise ends of both side panel portions 10SP, thereby constituting fastening means 22. Has been. The fastening means 22 may be formed at the abdomen side position 10FP of the diaper main body 15.

  FIG. 3 is a cross-sectional view in the width direction of the absorbent body 14 before use (before excretion) according to the first embodiment of the present invention. As shown in the figure, the absorbent body 14 is composed of a water-soluble fiber 23, a water-insoluble fiber 24, and a highly water-absorbent resin 25.

  The water-soluble fiber 23 is a fiber that changes into a gel or liquid form after a certain period of time has passed after contact with water. Examples of such water-soluble fibers 23 include known water-soluble fibers such as starch and sodium carboxymethyl cellulose, polyvinyl alcohol, polyacrylamide, cationic resins, polyacrylic acid and derivatives thereof, and synthetic fibers such as polyethylene oxide. Various fibers can be used. Of these, polyvinyl alcohol fibers are particularly preferably used. These water-soluble fibers 23 may be used alone or in combination of two or more.

  Moreover, the shape of the water-soluble fiber 23 in the absorbent body 14 may be one in which short fibers are heat-sealed, or one in which an adhesive is used or mechanically entangled and bonded. Long fibers may be intertwined, or these short fibers and long fibers may be mixed. However, as will be described later, in order to make the volume of the void 26 formed by dissolving the water-soluble fiber 23 equal to or larger than a certain size and prevent the absorption capacity of the absorbent body 14 from decreasing, the water-soluble fiber 23 is: Rather than being present in the absorbent body 14 in the state of long fibers (filament state), it is preferable to exist in the state of short fibers having a volume greater than a certain size.

The volume of the water-soluble fiber 23 is equal to or greater than the volume when the superabsorbent resin 25 having a particle diameter of 400 μm swells 100 times, that is, 3 mm ³ or more, so that the water-soluble fiber 23 is dissolved. It is preferable because the volume of the gap 26 can be set to a certain size or more, and a decrease in the absorption capacity of the absorber 14 can be prevented.

  In addition, since the water-soluble fiber 23 used in the present invention is preferably dissolved after 30 minutes (until the next excretion), the dissolution rate of the water-soluble fiber 23 is 10 g / min or more. Is preferred.

  As water-insoluble fiber 24, well-known various things, such as cotton-like pulp, can be used.

  Examples of the superabsorbent resin 25 include a cross-linked polyacrylate, a self-crosslinked polyacrylate, a saponified acrylate-vinyl acetate copolymer cross-linked product, a cross-linked isobutylene / maleic anhydride copolymer, Various known products such as cross-linked polysulfonate and water-swellable polymers such as polyethylene oxide and polyacrylamide may be used. Of these, those based on acrylic acid or acrylate that are excellent in water absorption and absorption speed are preferred. These superabsorbent resins 25 may be used alone or in combination of two or more. Further, these highly water-absorbent resins 25 can adjust the water absorption force and the absorption speed by adjusting the crosslinking density and the crosslinking density gradient in the production process.

  In addition, a deodorant, a disinfectant, etc. may be appropriately mixed in the absorbent body according to the purpose of use and needs, and various known deodorants and disinfectants should be used. Can do.

  Moreover, it is preferable that thickness T1 of this absorber 14 before use is 15 mm or less. If the thickness T1 is greater than 15 mm, it is difficult to make the paper diaper 10 thin and bulky. Therefore, the paper diaper 10 cannot be folded in a compact manner, and carrying convenience and efficiency of physical distribution are hindered.

  FIG. 4 is a cross-sectional view in the width direction of the absorbent body 14 immediately after excretion. As shown in the figure, when the body fluid is absorbed by the absorber 14, the superabsorbent resin 25 absorbs the body fluid and swells, so the thickness T2 of the absorber 14 immediately after excretion is the thickness of the absorber 14 before excretion. It becomes thicker than T1, that is, T1 <T2.

  On the other hand, the water-soluble fiber 23 dissolves when it absorbs the body fluid, and a void 26 is formed at this dissolved position. Therefore, even if the highly water-absorbent resin 25 absorbs the body fluid and swells, it remains constant in the absorber 14. The space | gap 26 more than a volume is ensured. Therefore, since the path | route through which a bodily fluid passes can be ensured, the diffusibility and absorption speed of a bodily fluid do not fall, and the fall of the absorption capacity of the absorber 14 can be prevented.

  Moreover, since the space | gap 26 more than fixed volume can be ensured in the absorber 14, even if the highly water-absorbent resin 25 swells, the path | route through which a bodily fluid passes can be ensured, and a gel block is prevented. Can do.

  FIG. 5 is a cross-sectional view in the width direction of the absorbent body 14 after a fixed time has elapsed since excretion. As shown in the drawing, in the absorbent body 14, when a certain time has passed since excretion, the void 26 formed at the position where the water-soluble fiber 23 is dissolved is not crushed by the body pressure of the wearer. Therefore, the absorbent body 14 shown in FIG. 5 has a smaller volume than the volume of the void 26 formed by dissolving the water-soluble fiber 23, and the absorbent body 14 shown in FIG. After that, the thickness T3 of the absorber 14 becomes thinner than the thickness T2 of the absorber 14 shown in FIG. 4, that is, T2> T3.

In addition, it is preferable that thickness T3 of the absorber 14 after fixed time passes after excretion is 20 mm or less after a pressurization of 2.068 × 10 ³ Pa. When the thickness T3 of the absorbent body 14 after pressurization is 20 mm or less, even when there is excretion, the appearance when the disposable diaper 10 is worn is refreshed and the appearance is improved. Further, when the used paper diaper 10 is discarded, the paper diaper 10 can be folded in a compact manner, so that dust does not become large and bulky. Therefore, even in a place where the used disposable diaper 10 is discarded, the storage space for the used disposable diaper can be made smaller than before.

In addition, as for this absorber 14, it is preferable that the bodily fluid absorption amount at the time of pressurization is 3 g / cm < ² > or less.

  The blending ratio of the constituent elements 23, 24, and 25 of the absorbent body 14 is such that the water-soluble fiber 23 is 20% or more and less than 100%, the water-insoluble fiber 24 is 80% or less, and the rest is the superabsorbent resin 25. Preferably there is.

  When the mixing ratio of the water-soluble fibers 23 is less than 20%, the volume of the voids 26 formed by dissolving the water-soluble fibers 23 does not exceed a certain size, and absorption after a certain time has passed since excretion. The thickness T3 of the body 14 cannot be reduced to a desired thickness. In addition, since the volume of the voids 26 formed by dissolving the water-soluble fibers 23 cannot be a certain size or more, when the highly water-absorbing resin 25 absorbs water and swells, the spaces between the highly water-absorbing resins A contact cannot be avoided and the absorption capacity of the absorber 14 will be reduced.

  In addition, when the blending ratio of the water-insoluble fiber 24 is higher than 80%, the blending ratio of the water-soluble fiber 23 is inevitably lowered. Therefore, as described above, the thickness of the absorbent body 14 after a certain time has passed since excretion. T3 cannot be reduced to a desired thickness.

Further, the highly water-absorbent resin 25 is blended so that the basis weight is 400 g / m ² or less. If the basis weight of the superabsorbent resin 25 exceeds 400 g / m ² , the amount of superabsorbent resin 25 blended in the absorber 14 increases, so that the fluid retention of the absorber 14 can be improved, Since the superabsorbent resin 25 swells when it absorbs body fluid, the thickness T2 or T3 of the absorbent body 14 after excretion becomes too thick and bulky. Therefore, the appearance is not refreshed when worn and the appearance is deteriorated. Further, the used disposable diaper 10 is bulky and cannot be folded compactly, and the dust cannot be reduced.

  In addition, since the water-absorbing resin 25 cannot exhibit water absorbing power unless it is wet to some extent, the initial absorption speed (absorption speed until the water-absorbing resin 25 gets wet to some extent) is slow. For this reason, the body fluid that has reached the absorbent body 14 is first absorbed by the water-soluble fibers 23 and the water-insoluble fibers 24 that have a significantly higher initial absorption rate than the high water-absorbent resin 25, and then the water-soluble fibers 23 and the water-insoluble fibers. The body fluid that is not absorbed by the fibers 24 and retained in the absorbent body 14 moves to the superabsorbent resin 25. For this reason, when the blending amount of the superabsorbent resin 25 increases, the blending ratio of the water-soluble fibers 23 and the water-insoluble fibers 24 inevitably decreases, so that the amount of body fluid absorbed at the initial stage decreases. As a result, the body fluid that is not absorbed by the water-soluble fiber 23 or the water-insoluble fiber 24 and is retained in the absorbent body 14 returns to the top sheet 11 or is retained on the top sheet 11, which is not preferable.

  Further, when the amount of the superabsorbent resin 25 blended in the absorber 14 increases, the amount of the superabsorbent resin 25 that moves in the absorber 14 increases, and local absorption of body fluid occurs in the absorber 14, Since the absorption capacity is lowered, it is not preferable.

  Furthermore, if the blending amount of the superabsorbent resin 25 blended in the absorbent body 14 is increased, it will be rough and uncomfortable for the wearer.

Further, the absorbent body 14 preferably has a plane area of 50 cm ² or more from the viewpoint of body fluid absorption ability and body fluid retention.

  In addition, the preferable relationship between the plain area of the absorber 14 of this paper diaper 10 and the compounding ratio of each component 23,24,25 of the absorber 14 is as follows.

That is, when the planar area of the absorbent body 14 is 50 cm ² or more and less than 300 cm ² , the mixing ratio of each component of the absorbent body 14 is 30 to 50% for the water-soluble fiber 23 and 20% for the water-insoluble fiber 24. The remainder is preferably the superabsorbent resin 25. Also, when the plane area of the absorber 14 is less than 300 cm ² or more 600 cm ^2, the mixing ratio of each component of the absorber 14, the water-soluble fibers 23 20-40% water insoluble fiber 24 is 20% The remainder is preferably the superabsorbent resin 25. Furthermore, when the plane area of the absorbent body 14 is 600 cm ² or more, the blending ratio of each component of the absorbent body 14 is 20 to 30% for the water-soluble fiber 23, 20% for the water-insoluble fiber 24, and the rest. Is preferably a superabsorbent resin 25. With such a relationship, the paper diaper 10 can be made thin and compact before use, and it can be folded compactly without being bulky even when the used paper diaper 10 is discarded. It will be smaller and will look better when worn and will look better.

  As described above, the absorber 14 used in the disposable diaper 10 according to the present invention has been described with respect to the absorber 14 in which the superabsorbent resin 25 is blended. However, in the present invention, the superabsorbent resin 25 is not blended. The present invention can also be applied to an absorber.

  FIG. 6 shows an absorbent body 14A according to a modification of the first embodiment of the present invention described above. In addition, since this absorber 14A is substantially the same as the above-described absorber 14 except for the fact that the superabsorbent resin 25 is not blended, it is the same for the same components below. A description will be given with reference numerals.

  Fig.6 (a) is sectional drawing of the width direction of 14 A of absorbers before use. As shown in the figure, the absorbent body 14 </ b> A is composed of water-soluble fibers 23 and water-insoluble fibers 24. Note that a deodorant, a bactericide, or the like may also be mixed in the absorbent body 14A.

  Moreover, it is preferable that the thickness T1 of the absorber 14A before use is 15 mm or less, like the absorber 14 described above.

  FIG. 6B is a cross-sectional view in the width direction of the absorbent body 14A immediately after excretion. As shown in the drawing, when the body fluid is absorbed by the absorbent body 14A, the water-soluble fiber 23 is dissolved, and a void 26 is formed at this dissolved position. In addition, since the superabsorbent resin 25 is not blended in the absorbent body 14A, the thickness T2 of the absorbent body 14A immediately after excretion is not different from the thickness T1 of the absorbent body 14A before use, that is, T1 = T2.

  FIG.6 (c) is sectional drawing of the width direction of 14 A of absorbers after a fixed time passes since excretion. As illustrated, in the absorbent body 14A as well, the gap 26 formed at the position where the water-soluble fiber 23 is dissolved is not crushed by the wearer's body pressure.

  Therefore, similarly to the above-described absorber 14, the absorber 14 </ b> A is also based on the volume of the void 26 formed by dissolving the water-soluble fiber 23, from the absorber 14 </ b> A shown in FIGS. 6 (a) and 6 (b). Since the volume is also reduced, the thickness T3 of the absorbent body 14A after a certain time has passed since excretion becomes thinner than the thicknesses T1 and T2 of the absorbent body shown in FIGS. 6 (a) and 6 (b). T1 = T2> T3.

  Therefore, even if the absorbent body 14A is not blended with the superabsorbent resin 25, the paper diaper 10 can be made thinner and more compact before use, and the thickness of the absorbent body 14A can be reduced even if excreted. Since it does not increase and does not become bulky, the appearance at the time of wearing is refreshed and the appearance is improved. In addition, when the used disposable diaper 10 is discarded, the disposable diaper 10 is not bulky and can be folded compactly, so that dust can be reduced.

  FIG. 7 shows an absorbent body 14B (before use) according to another modification of the first embodiment of the present invention. FIG. 7A is a cross-sectional view in the width direction of the absorbent body 14B. FIG. 7B is a top view of the absorbent body 14B. In addition, since this absorber 14B is substantially the same as the above-described absorbers 14 and 14A except for the mixing ratio of the water-soluble fiber 23 in the thickness direction and the longitudinal direction, the same configuration is used hereinafter. Elements will be described with the same reference numerals.

  As shown in FIG. 7A, the absorbent body 14B increases the blending ratio of the water-soluble fibers 23 on the skin contact surface side (top sheet 11 side) of the absorbent body 14B, and increases the outer surface side (back sheet 12 side). ), The blending ratio of the water-soluble fiber 23 is lowered. Thus, it is preferable to reduce the blending ratio of the water-soluble fibers 23 in the order in which the body fluid passes, since the absorption capacity of the absorbent body 14B can be improved.

  In this case, for example, when the absorber 14B is divided into three in the thickness direction, a surface layer portion (layer on the top sheet 11 side) 27, a middle layer portion 28, and a lower layer portion (layer on the back sheet 12 side) 29, The water-soluble fiber 23 is preferably blended in the surface layer portion 27 in a proportion of 40% to 70%, in the middle layer portion 28 in a proportion of 30% to 60%, and in the lower layer portion 29 in a proportion of 0% to 30%. As described above, when the mixing ratio of the water-soluble fibers 23 is set as the surface layer portion 27> the middle layer portion 28> the lower layer portion 29, that is, when the mixing ratio of the water-soluble fibers 23 is decreased in the order in which the body fluid passes, the absorption capacity of the absorbent body 14B. Can be improved.

  Further, as shown in FIG. 7B, the absorbent body 14B has a high blending ratio of the water-soluble fibers 23 in the central portion in the longitudinal direction. When the water-soluble fiber 23 is blended in this way, a large amount of the water-soluble fiber 23 is blended in the vicinity of the position where excretion concentrates, and thus the absorption capacity of the absorbent body 14B can be further improved.

  In this case, for example, when the absorbent body 14B is divided into the A region, the B region, and the C region in the longitudinal direction, the water-soluble fiber 23 is 0% or more and 30% or less in the A region and in the B region. 40% or more and 100% or less, blended in the C region at a rate of 0% or more and 30% or less, that is, the central portion in the longitudinal direction of the absorber 14B is 40% or more and 100% or less, and both ends are 0% or more and 30%. It is preferable that it is blended at a ratio of% or less. Thus, when more water-soluble fibers 23 are blended in the central portion of the absorbent body 14 in the longitudinal direction, that is, in the vicinity of the position corresponding to the urination port, more water-soluble fibers 23 are blended in the position where excretion is concentrated. Therefore, the absorption capacity of the absorber 14B can be further improved.

  Therefore, the absorbent body 14B as described above can reduce the thickness T3 even when excreted, so that it does not become bulky and can further improve the absorption capacity.

  FIG. 8 shows an absorbent body 14C (before use) according to still another modification of the first embodiment of the present invention, and FIG. 8A is a cross-sectional view in the width direction of the absorbent body 14C. FIG. 8B is a top view of the absorbent body 14C. In addition, since this absorbent body 14C is substantially the same as the absorbent body 14 described above except for the mixing ratio in the longitudinal direction of the water-soluble fiber 23, the same reference numerals are used for the same constituent elements below. Will be described.

  As shown in FIG. 8A, the absorbent body 14C has water-soluble fibers 23 uniformly blended in the thickness direction, that is, the surface layer portion 27, the middle layer portion 28, and the lower layer portion 29 of the absorbent body 14C. The water-soluble fibers 23 are blended in each layer at the same blending ratio.

  Moreover, as for absorber 14C, as shown in FIG.8 (b), the compounding rate of the water-soluble fiber 23 of the center part (B area | region) of a longitudinal direction is made high. When the water-soluble fiber 23 is blended in this way, a large amount of the water-soluble fiber 23 is blended in the vicinity of the position where excretion concentrates, so that the absorption capacity of the absorbent body 14C can be improved. Even in this case, the water-soluble fibers 23 are blended in a proportion of 0% to 30% in the A region, 40% to 100% in the B region, and 0% to 30% in the C region. Is preferred.

  Even if it is such an absorber 14C, when excretion occurs, the thickness T3 can be reduced, so that it does not become bulky, and the absorption capacity of the absorber 14C can be improved.

  FIG. 9 shows an absorbent body 14D (before use) according to still another modification of the first embodiment of the present invention, and FIG. 9A is a cross-sectional view in the width direction of the absorbent body 14D. FIG. 9B is a top view of the absorbent body 14D. In addition, since this absorbent body 14D is substantially the same as the above-described absorbent body 14 except for the mixing ratio in the thickness direction of the water-soluble fiber 23, the same reference numerals are used for the same components below. Will be described.

  As shown in FIG. 9A, the absorbent body 14D increases the blending ratio of the water-soluble fibers 23 on the top sheet 11 side of the absorbent body 14D, and blends the water-soluble fibers 23 toward the back sheet 12 side. The rate is low. Thus, if the compounding rate of the water-soluble fiber 23 is lowered in the order in which the body fluid passes, the absorption capacity of the absorbent body 14D can be improved. Even in this case, the water-soluble fiber 23 is 40% or more and 70% or less in the surface layer portion 27 of the absorbent body 14D, 30% or more and 60% or less in the middle layer portion 28, and 0% or more and 30% or less in the lower layer portion 29. It is preferable that they are blended in proportions.

  Moreover, as shown in FIG. 9B, the absorbent body 14D has water-soluble fibers 23 uniformly blended in the longitudinal direction. That is, the water-soluble fiber 23 is blended in the same proportion in each of the A region, the B region, and the C region of the absorbent body 14D.

  Even if it is such an absorber 14D, when excretion occurs, the thickness T3 can be reduced, so that it does not become bulky, and the absorption capacity of the absorber 14D can be improved.

  As mentioned above, although the absorbent article which concerns on this invention was demonstrated based on one Embodiment, the structure of the absorbent article which concerns on this invention can be changed as follows.

  FIG. 10 shows an absorbent body 14 ′ (before use) used in a disposable diaper 10 ′ (not shown) according to the second embodiment of the present invention. FIG. 10 (a) shows the absorbent body 14 ′. FIG. 10B is a top view of the absorbent body 14 ′.

  As shown in FIG. 10, the absorbent body 14 ′ is composed of water-insoluble fibers 24, and one web-like sheet 30 is intermittently disposed inside the absorbent body 14 ′. Yes.

  The web-like sheet 30 is a non-woven fabric mainly composed of synthetic fibers such as polyethylene, polypropylene, polyester, etc., and water-soluble fibers 31 are blended in the web-like sheet 30 used in the present invention. In addition, as the water-soluble fiber 31, like the water-soluble fiber 23 mix | blended with the absorber 14 mentioned above, a dissolution rate is 10 g / min or more, A well-known various thing can be used.

  In addition to the water-soluble fiber 31, the material for forming the web-like sheet 30 includes various known fibers such as natural fibers such as cotton, wool and hemp, and regenerated fibers such as rayon and cupra. May be.

  When the web-like sheet 30 in which the water-soluble fibers 31 are blended in this way is intermittently provided inside the absorbent body 14 ′, body fluid reaches the absorbent body 14 ′ and is absorbed by the web-like sheet 30. Then, the water-soluble fiber 31 is dissolved. Accordingly, since the volume of the web-like sheet 30 is reduced by the amount of the water-soluble fiber 31 dissolved, the thickness of the absorbent body 14 'can be reduced. Therefore, the thickness of the disposable diaper 10' after urination can be reduced. And it will not be bulky.

  Further, when the web-like sheet 30 is provided inside the absorbent body 14 'in this way, the diffusibility of body fluid is improved and local absorption of the absorbent body 14' can be prevented. Absorption capacity can be improved.

  Furthermore, it is preferable that the thickness T1 of the absorbent body 14 'before use is 15 mm or less from the viewpoints of carrying out the disposable diaper 10' and improving the efficiency of carrying.

  As shown in the figure, the web-like sheet 30 is not limited to the case where one sheet is disposed inside the absorbent body 14 ′, and a plurality of sheets may be disposed. Moreover, the arrangement | positioning position will not be specifically limited if it is arrange | positioned inside absorber 14 '.

  As described above, the case where the absorbent body 14 ′ used in the paper diaper according to the present embodiment is an absorbent body composed of the water-insoluble fiber 24 has been described, but the absorbent body 14 ′ according to the present embodiment is In addition, an absorber in which the water-soluble fiber 23 and / or the highly water-absorbent resin 25 are blended, that is, an absorber (not shown) constituted by the water-insoluble fiber 24 and the highly water-absorbent resin 25, or the above-mentioned According to the first embodiment, the absorbent body 14 composed of the water-soluble fiber 23, the water-insoluble fiber 24, and the highly water-absorbent resin 25 as shown in FIG. 3, or the water-soluble fiber as shown in FIG. The present invention can also be applied to various known absorbers such as the absorber 14 </ b> A composed of the water-soluble fiber 23 and the water-insoluble fiber 24. That is, the desired effect of the present invention is obtained by intermittently disposing at least one web-like sheet 30 containing the water-soluble fiber 31 as described above in the absorbent body. be able to.

  In addition, when applying the absorber to which water-soluble fiber 23 is mix | blended as absorber 14 ', ie, the absorber 14 which concerns on 1st Embodiment, etc. to this embodiment, it is used for the web-like sheet | seat 30. FIG. The blending amount of the water-soluble fiber 31 is not included in the blending amount of the water-soluble fiber 23 used in the absorbent body 14 ′.

  Moreover, when using the absorber with which the water-soluble fiber 23 is mix | blended, it is preferable that the water-soluble fiber 23 is mix | blended 20% or more and less than 100% similarly to 1st Embodiment mentioned above.

  Moreover, when using the absorber with which the water-soluble fiber 23 is mix | blended, when the absorber is divided into the surface layer part 27, the middle layer part 28, and the lower layer part 29 in the thickness direction, surface layer part 27 to 40% to 70%, the middle layer portion 28 to 30% to 60%, and the lower layer portion 29 to 0% to 30%.

  Furthermore, it is preferable that the water-soluble fiber 23 is blended at 40% or more and 100% or less at the central portion in the longitudinal direction of the absorbent body and at 0% or more and 30% or less at both ends.

  The configuration of the disposable diaper according to the present invention can be changed as follows.

  FIG. 11 is a cross-sectional view in the width direction of a disposable diaper 10 ″ according to the third embodiment of the present invention, and FIG. 12 is a cross-sectional view in the width direction of the absorbent body and the web-like sheet before use used in FIG. FIG.

  In other words, as shown in the figure, the present paper diaper 10 ″ includes an absorbent body composed of a top sheet 11, a second sheet 16, a web-like sheet 32, and water-insoluble fibers 24 in order from the skin contact surface side. The diaper main body 15 is constituted by 14 ″, the web-like sheet 32, the waterproof film 17, and the back sheet 12. The second sheet 16 and the waterproof film 17 may be omitted as appropriate.

  The web-like sheet 32 is blended with water-soluble fibers 33 having a dissolution rate of 10 g / min or more, and is formed in the same manner as the web-like sheet 30 used in the second embodiment described above. Therefore, when the web-like sheet 32 is provided on the skin contact surface side and the lower surface side of the absorbent body 14 ″, there is excretion, and when the body fluid reaches the web-like sheet 32, the water-soluble fibers 33 are dissolved. Accordingly, since the volume of the web-like sheet 32 is reduced by the amount of the water-soluble fiber 33 dissolved, the thickness of the disposable diaper 10 ″ after urination can be reduced and the bulk is not increased.

  Further, when the web-like sheet 32 is provided on the skin contact surface side and the lower surface side of the absorbent body 14 in this way, body fluid is diffused to some extent by the web-like sheet 32, and thus the entire upper surface of the absorbent body 14 ″. Thus, the body fluid can be absorbed, and the absorption capacity of the absorber 14 ″ is improved. Similarly, it is preferable to provide the web-like sheet 32 on the lower surface side of the absorbent body 14 ″ because the body fluid diffusibility of the absorbent body 14 is further improved.

  The web-like sheet 32 is not necessarily disposed on the skin contact surface side and the lower surface side of the absorbent body 14 ″, and at least the skin contact surface side or the lower surface side of the absorbent body 14 ″. It is sufficient to be disposed in any of the above.

  As mentioned above, although the case where the absorber 14 '' used for the paper diaper 10 '' according to the present embodiment is an absorber composed of the water-insoluble fibers 24 has been described, the absorber according to the present embodiment is as follows. In addition, since it is not particularly limited, an absorbent body in which the water-soluble fiber 23 and / or the highly water-absorbent resin 25 are blended, that is, the water-insoluble fiber 24 and the highly water-absorbent resin 25 are included. Absorber (not shown), or an absorption device comprising the water-soluble fiber 23, the water-insoluble fiber 24, and the superabsorbent resin 25 as shown in FIG. 3 according to the first embodiment described above. The present invention can also be applied to various known absorbers such as the body 14.

  That is, if the web-like sheet 32 in which the water-soluble fiber 33 is blended is provided on the skin contact surface side and / or the lower surface side of the absorbent body, when there is excretion, the disposable diaper 10 ″ The thickness can be reduced, and it is not bulky. In particular, when an absorbent body containing the water-soluble fiber 23 according to the first embodiment is used as the absorbent body 14 ', the thickness of the disposable diaper 10 "after the excretion is reduced. Can become bulky.

  Further, when the absorbent body in which the water-soluble fiber 23 is blended, that is, the absorbent body 14 according to the first embodiment is applied to this embodiment, the blend of the water-soluble fiber 33 used in the web-like sheet 32 is blended. The amount is not included in the blending amount of the water-soluble fiber 23 used in the absorber.

  In addition, it is preferable that thickness T1 of absorber 14 '' before use is 15 mm or less.

  Furthermore, the configuration of the disposable diaper according to the present invention can be changed as follows.

  FIG. 13: is sectional drawing of the width direction of the absorber before use used for the paper diaper which concerns on 4th Embodiment of this invention, and a web-shaped sheet | seat.

  As illustrated, the disposable diaper 10 ″ ″ (not shown) according to the present embodiment includes at least one absorber 14 ′ ″ according to the second embodiment, that is, at least one inside the absorber. The absorbent body in which the web-like sheet 30 is provided intermittently is used, and the web-like sheet 32 is provided on the skin contact surface side and the lower surface side.

  Each of the web-like sheets 30 and 32 is blended with water-soluble fibers 31 and 33 and formed in the same manner as the web-like sheets 30 and 32 according to the second and third embodiments described above. can do.

  Thus, when the web-like sheet 32 in which the water-soluble fiber 33 is blended is provided on the skin contact surface side and the lower surface side of the absorbent body 14 ′ according to the second embodiment, when there is excretion, the body fluid is First, the web-like sheet 32 is reached, and the water-soluble fibers 33 are dissolved. Next, the body fluid reaches the absorbent body 14 '' ', reaches the web-like sheet 30 disposed therein, and the water-soluble fibers 31 are dissolved. Accordingly, since the volume of the web-like sheets 30 and 32 is reduced by the amount of the water-soluble fibers 31 and 33 dissolved, the thickness of the paper diaper 10 ″ ″ after urination can be further reduced, and it is not bulky and absorbed. The absorption capacity of the body 14 '' 'can be improved.

  An absorbent body in which a web-like sheet 30 in which water-soluble fibers 31 are blended is intermittently disposed inside the absorbent body in which water-soluble fibers 23 are blended. When used, the thickness of the disposable diaper 10 ′ ″ after urination can be further reduced, and it will not be bulky.

  Note that the web-like sheet 32 is not necessarily disposed on the skin contact surface side and the lower surface side of the absorbent body 14 ′ ″, but at least the skin contact surface side of the absorbent body 14 ′ ″ or What is necessary is just to be arrange | positioned in either of the lower surface side.

  As mentioned above, although the case where the absorbent article is a paper diaper has been described as an example of the absorbent article according to the present invention, the present invention can also be applied to sanitary napkins.

  The preferred relationship between the area of the absorbent body when the absorbent article is a sanitary napkin and the blending ratio of each component of the absorbent body (water-soluble fiber, water-insoluble fiber, superabsorbent resin) is as follows. It is. In addition, since the other structure except the relationship between the plain area of an absorber and the compounding ratio of each component of an absorber is substantially the same as the paper diaper mentioned above, below, it is the same to the same component. This will be described with reference numerals.

That is, when the planar area of the absorbent body 14 is 50 cm ² or more and less than 100 cm ² , the mixing ratio of each component of the absorbent body 14 is 60 to 80% for the water-soluble fiber 23 and 40 to 40 for the water-insoluble fiber 24. It is preferable that 20% and the remainder is the superabsorbent resin 25. Also, when the plane area of the absorber 14 is less than 100 cm ² or more 200 cm ^2, the mixing ratio of each component of the absorber 14, the water-soluble fibers 23 50-70% water insoluble fiber 24 is 50 It is preferable that 30% and the balance is the superabsorbent resin 25. Furthermore, when the planar area of the absorber 14 is 200 cm ² or more, the blending ratio of each component of the absorber 14 is 40 to 60% for the water-soluble fiber 23 and 60 to 40% for the water-insoluble fiber 24. The remainder is preferably the superabsorbent resin 25.

  In addition, when the absorbent article is a sanitary napkin, it is particularly required that the absorbent body after excretion is thin and not bulky compared to a paper diaper, and that the appearance is clean and attractive when worn. For this reason, the blending ratio of the superabsorbent resin is preferably 1% or less. As described above, the absorbent used for the sanitary napkin has a high blending ratio of water-soluble fibers and a low blending ratio of the highly water-absorbent resin. Therefore, the thickness of the absorbent body of the sanitary napkin is the same as that of the paper diaper described above. However, T2> T3> T1 is not always satisfied, and T2> T1> T3 may be satisfied.

The present invention is not limited to the tape-type disposable paper diaper as described above, but can be applied to various other known absorbent articles such as a pants-type disposable paper diaper, a urine collection pad, a disposable swimsuit, and an incontinence pad. be able to.

It is a development top view of a tape type paper diaper concerning the present invention. It is XX sectional drawing of FIG. It is sectional drawing of the width direction of the absorber before use which concerns on 1st Embodiment of this invention. It is sectional drawing of the width direction of the absorber just after the excretion which concerns on 1st Embodiment of this invention. It is sectional drawing of the width direction of the absorber after fixed time passes from the excretion which concerns on 1st Embodiment of this invention. It is a figure which shows the absorber which concerns on the example of a change of 1st Embodiment of this invention. It is a figure which shows the absorber which concerns on the other modification of 1st Embodiment of this invention. It is a figure which shows the absorber which concerns on another modification of 1st Embodiment of this invention. It is a figure which shows the absorber which concerns on another modification of 1st Embodiment of this invention. It is a figure which shows the absorber used for the absorbent article which concerns on 2nd Embodiment of this invention. It is sectional drawing of the width direction of the absorbent article which concerns on 3rd Embodiment of this invention. It is sectional drawing of the width direction of the absorber used for the absorbent article which concerns on 3rd Embodiment of this invention. It is sectional drawing of the width direction of the absorber used for the absorbent article which concerns on 4th Embodiment of this invention, and a web-shaped sheet | seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Paper diaper 14,14 ', 14'',14''''Absorber 23,31,33 Water-soluble fiber 24 Water-insoluble fiber 25 High water-absorbent resin 26 Cavity 27 Surface layer part 28 Middle layer part 29 Lower layer part 30, 32 Web Sheet T1, T2, T3 Absorber thickness

Claims (14)

  The article body is composed of at least a top sheet disposed on the skin contact surface side, a back sheet disposed on the outer surface side, and an absorbent body interposed between the two sheets and composed of at least water-insoluble fibers. An absorbent article comprising the absorbent body and water-soluble fibers.   The absorbent article according to claim 1, wherein a superabsorbent resin is blended in the absorbent body.   The absorbent article according to claim 1, wherein the water-soluble fiber has a dissolution rate of 10 g / min or more.   The absorbent article according to any one of claims 1 to 3, wherein the absorbent body contains 20% or more and less than 100% of the water-soluble fiber.   When the absorbent body is divided into a surface layer portion, a middle layer portion, and a lower layer portion in the thickness direction, the water-soluble fiber is 40% to 70% in the surface layer portion, and 30% to 60% in the middle layer portion. The absorbent article according to any one of claims 1 to 4, wherein 0 to 30% is blended in the lower layer portion.   6. The water-soluble fiber is blended at 40% or more and 100% or less at the central part in the longitudinal direction of the absorbent body, and 0% or more and 30% or less at both ends. The absorbent article in any one of.   The article main body is composed of at least a top sheet disposed on the skin contact surface side, a back sheet disposed on the outer surface side, and an absorbent body interposed between the two sheets and composed of at least water-insoluble fibers. In this absorbent article, the absorbent article is characterized in that at least one web-like sheet containing water-soluble fibers is intermittently disposed inside the absorbent body.   The article main body is composed of at least a top sheet disposed on the skin contact surface side, a back sheet disposed on the outer surface side, and an absorbent body interposed between the two sheets and composed of at least water-insoluble fibers. An absorbent article comprising a web-like sheet in which water-soluble fibers are blended on the skin contact surface side and / or the lower surface side of the absorbent body.   The absorbent article according to claim 7, wherein a web-like sheet in which water-soluble fibers are blended is provided on the skin contact surface side and / or the lower surface side of the absorbent body.   The absorbent article according to any one of claims 7 to 9, wherein the absorbent body contains water-soluble fibers and / or a highly water-absorbent resin.   The absorbent article according to any one of claims 7 to 10, wherein the water-soluble fiber has a dissolution rate of 10 g / min or more.   The absorbent article according to claim 10 or 11, wherein the absorbent body contains 20% or more and less than 100% of the water-soluble fiber.   When the absorbent body is divided into a surface layer portion, a middle layer portion, and a lower layer portion in the thickness direction, the water-soluble fiber is 40% to 70% in the surface layer portion, and 30% to 60% in the middle layer portion. The absorbent article according to any one of claims 9 to 12, wherein 0% to 30% is blended in the lower layer portion.   14. The water-soluble fiber is blended at 40% or more and 100% or less at the central portion in the longitudinal direction of the absorbent body, and 0% or more and 30% or less at both ends. The absorbent article in any one of.

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