JP2008289640A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article excellent in the absorption of excretory liquid. <P>SOLUTION: The absorbent article 1 includes an absorbent 22, a top sheet 18 disposed so as to cover the surface of the absorbent 22 and at least partially constituted of a liquid permeable material, and a back sheet 20 disposed on the back surface of the absorbent 22 and composed of a liquid impermeable material. A diffusion sheet 23 is disposed inside the absorbent 22. Further, on the absorbent 22, a hole part 15 communicates from the surface of the absorbent 22 to the surface of the diffusion sheet 23 disposed inside is formed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article. More specifically, the present invention relates to an absorbent article having excellent excretory fluid absorbability.

  Absorbent articles include disposable diapers that absorb excretory fluids such as urine (for example, tape-type diapers, pants-type diapers, urine pads, etc.), sanitary napkins that absorb menstrual blood, and sheets that absorb caged items. It is used in. For example, a disposable diaper having a top sheet, a back sheet, and an absorbent body interposed between a part of both sheets as an absorbent article for infants or adults such as the elderly and persons with disabilities It is used.

  Such an absorbent article, for example, a disposable diaper is used by placing the surface of the top sheet in contact with the skin of the wearer so that the urine excreted by the wearer permeates through the top sheet and is absorbed. The back sheet that is absorbed and held by the body and excellent in leakage prevention prevents leakage of excretory fluid to the outside.

  In the conventional absorbent article, the excreted liquid that has permeated from the top sheet has been absorbed from the surface side (the wearer's skin side) of the absorbent body in accordance with the absorption speed of the absorbent body. However, when the excretion rate exceeds the absorption rate of the absorber, or when a large amount of excretion fluid is excreted at once, the phenomenon of excretion fluid flowing on the top sheet has occurred. In such a case, the excretory fluid that has not been absorbed and has flowed on the top sheet contaminated the wide range of the wearer's skin, causing an unpleasant feel as well as causing a rash. Furthermore, the excretory fluid that has flowed on the top sheet may leak out of the absorbent article.

  On the other hand, a lot of excretory liquid that is sequentially absorbed from the top sheet side of the absorbent article, that is, the surface side of the absorbent body, tends to be unevenly distributed on the surface side of the absorbent body in the thickness direction of the absorbent body. For this reason, when the wearer applies body pressure, the excretory fluid easily returns from the top sheet side, which is not only uncomfortable but also causes rashes.

  For this reason, an absorbent article in which a diffusion layer is disposed between the top sheet and the absorbent body has been proposed. This is because the excretory fluid that cannot be absorbed by the absorber is dispersed in the diffusion layer, the excretory fluid is temporarily stored, and the dispersion absorption is promoted in a wider range, thereby increasing the absorption rate and This has the effect of preventing the flow of excretory fluid in the water and preventing liquid leakage (see, for example, Patent Document 1).

JP-A-8-308873

  However, in the conventional absorbent article in which the diffusion layer is disposed between the top sheet and the absorbent body, only the absorption area on the surface of the absorbent body on the top sheet side is widened, and the diffused excreted liquid is removed from the surface of the absorbent body. Since it is not different from an absorbent article without a diffusion layer, the problem that the excretory liquid is unevenly distributed on the top sheet side and the excretory liquid tends to return has not been solved.

  The present invention has been made to solve such problems of the prior art, and provides an absorbent article having excellent excretory fluid absorbability.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventor diffused into the absorbent body as an absorbent body in an absorbent article including the absorbent body, the top sheet, and the back sheet. By using a sheet in which a sheet is disposed and forming a hole that communicates from the surface of the absorber to the surface of a diffusion sheet disposed inside the absorber, the above problem is solved. As a result, the present invention has been completed. Specifically, the following absorbent articles are provided by the present invention.

[1] An absorber, a top sheet that is arranged so as to cover the surface of the absorber, and at least a part is made of a liquid-permeable material, and a back sheet of the absorber that is made of a liquid-impermeable material. An absorbent article comprising a back sheet, wherein the absorbent body has a diffusion sheet disposed inside the absorbent body, and the absorbent body has a surface from the surface of the absorbent body. The absorbent article in which the hole part connected to the surface of the said diffusion sheet arrange | positioned inside the said absorber is formed.

[2] The absorber is configured by folding back so that both side edges cover a part of the diffusion sheet in a state where the diffusion sheet is disposed on one surface. The both side edge portions of the folded portion are folded back so that a gap is formed at least between the tip portions of the folded portion, and the gap between the tip portions is changed from the surface of the absorber to the surface of the diffusion sheet. The absorbent article according to the above [1], wherein the communicating hole is formed.

[3] The absorbent article according to [2], wherein the maximum width of the gap between the tip portions at the folded portion of the absorber is 5 to 35 mm.

[4] The absorbent article according to any one of [1] to [3], wherein the diffusion sheet is disposed inside the absorbent body at least in a region corresponding to the excretion site of the wearer.

[5] The absorbent article according to any one of [1] to [4], wherein the hole portion of the absorbent body is formed at least in a region corresponding to the excretion site of the wearer.

[6] The top sheet covers the surface of the absorber, covers the inner peripheral surface of the hole of the absorber, and the diffusion sheet exposed from the hole, The absorbent article according to any one of [1] to [5], wherein the top sheet and the diffusion sheet are joined at an opening on the surface side of the diffusion sheet.

  The absorptive article of the present invention is excellent in excretion fluid excretion. That is, the absorbent article of the present invention absorbs excreted fluid excreted from the wearer from the surface on the top sheet side of the absorbent body (the surface of the absorbent body), and excreted fluid that has flowed into the pores of the absorbent body. The diffusion sheet can be quickly passed and diffused, and the excretory fluid can be absorbed also from the inside of the absorber. For this reason, it is possible to increase the area of the site | part which actually contacts with excretion liquid and absorbs the excretion liquid, and can improve the absorption speed of an absorber significantly. For this reason, the absorptive article of the present invention can absorb a lot of excretion fluid which was not able to be processed conventionally, and excretion fluid with a fast excretion rate, and can prevent liquid leakage.

  Hereinafter, the best mode for carrying out the absorbent article of the present invention will be specifically described with reference to the drawings. However, the present invention broadly encompasses absorbent articles having the invention specific items, and is not limited to the following embodiments.

[1] Absorbent article:
The absorbent article of the present invention is arranged so as to cover the surface of the absorbent body 22 and the absorbent body 22, as in the absorbent article 1 shown in FIGS. 1 and 2, and at least a part thereof is made of a liquid-permeable material. It is the absorbent article 1 provided with the top sheet 18 which consists of, and the back sheet 20 which is arrange | positioned on the back surface of the absorber 22, and consists of a liquid-impermeable material.

  And the absorber 22 of the absorbent article 1 of the present invention has the diffusion sheet 23 disposed inside the absorber 22, and the absorber 22 absorbs from the surface of the absorber 22. A hole 15 communicating with the surface of the diffusion sheet 23 arranged inside the body 22 is formed.

  Here, FIG. 1 is a partially cutaway plan view showing an embodiment of the absorbent article of the present invention, and is a view showing a state in which the absorbent article is viewed from the top sheet side. FIG. 2 is a schematic cross-sectional view showing a cross section of the absorbent article shown in FIG. 1 cut along the line A-A ′.

  The absorbent article of the present invention absorbs excreted fluid excreted from the wearer from the surface on the top sheet side of the absorbent body (the surface of the absorbent body), and allows part of the excreted liquid to pass through the hole. The diffusion sheet can be quickly passed and diffused, and the excretory fluid can be absorbed also from the inside of the absorber. For this reason, it is possible to increase the area of the site | part which actually contacts with excretion liquid and absorbs the excretion liquid, and can improve the absorption speed of an absorber significantly. For this reason, the absorptive article of the present invention can absorb a lot of excretion fluid which was not able to be processed conventionally, and excretion fluid with a fast excretion rate, and can prevent liquid leakage.

  Further, the absorbent article of the present invention can increase the area of the site that absorbs the excretory fluid as described above, and the excreted fluid is not absorbed in a concentrated manner. Even when the liquid is excreted, the remaining capacity of the absorbent at the excretion site (for example, the crotch part of the wearer) (hereinafter sometimes referred to as “absorption capacity”) tends to remain. For this reason, for example, even when the wearer applies body pressure to the absorbent article, if the remaining absorption capacity remains, it is difficult for the excreted fluid absorbed to reverse (also referred to as liquid return). There is little sticking and it can be used well.

  Furthermore, since the excretory fluid can be directly absorbed from the inside of the absorber as described above, the absorbed excreted fluid is not unevenly distributed on the surface side of the absorber (that is, the skin side of the wearer) It is possible to effectively prevent the above-described excretory liquid from returning.

  Furthermore, in the absorbent article of the present invention, the hole formed in the absorbent body is formed into an elongated shape with the opening extending in the longitudinal direction, whereby the absorbent article is bent along the hole. The absorbent article can be easily adhered to the urination site of the wearer, and the fit to the wearer can be improved. In addition, when used as a disposable diaper composed of the front body, the crotch part, and the back body, it is possible to improve the fit around the legs and effectively prevent liquid leakage from the legs. Is also possible.

  Such an absorbent article of the present invention includes disposable diapers that absorb excretory fluids such as urine (for example, tape-type diapers, pants-type diapers, urine pads, etc.), sanitary napkins that absorb menstrual blood, It can be used as a sheet for absorbing cage.

  In the absorbent article of the present invention, it is preferable to use a sheet having higher liquid permeability than the absorber as the diffusion sheet disposed inside the absorber. By comprising in this way, excretion can be diffused via a diffusion sheet earlier than excretion is absorbed by an absorber. As a method for comparing the liquid permeability between the diffusion sheet and the absorber, the following methods can be used.

  First, an absorber (hereinafter, also referred to as “absorber A”) used for the absorbent article of the present invention and an absorber (hereinafter referred to as “absorber B”) in which a diffusion sheet is disposed on the upper surface of the same absorber. 2 types of absorbers are prepared. Each absorbent body (absorbers A and B) is interposed between the top sheet and the back sheet to absorb the same amount of physiological saline as the excretory fluid, and all the physiological saline is absorbed into the absorbent body. The time taken for absorption (absorption time) is measured.

  When the absorber B has a shorter absorption time, the liquid permeability of the diffusion sheet is higher than that of the absorber, and conversely, when the absorber A has a shorter absorption time, The liquid permeability is lower than that of the absorber.

[1-1] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  The absorber is interposed between the top sheet and the back sheet, and is interposed between the top sheet and the back sheet by sealing the periphery of the top sheet and the back sheet. Accordingly, a flap portion where no absorber is interposed between the top sheet and the back sheet is formed at the peripheral edge of the absorber, or the absorber edge portion is formed by at least one of the top sheet and the back sheet. Is wrapped.

  The absorbent body used in the absorbent article of the present invention is one in which a diffusion sheet is disposed inside the absorbent body. Further, the absorbent body is disposed from the surface of the absorbent body to the inside of the absorbent body. A hole communicating with the surface of the diffusion sheet is formed.

  In addition, as a specific example of such an absorber, the thing like the absorbent article 1 shown in FIG.1 and FIG.2 can be mentioned. In the absorbent article 1 shown in FIGS. 1 and 2, the absorbent body 22 is folded back so that both side edges cover a part of the diffusion sheet 23 in a state where the diffusion sheet 23 is disposed on one surface. The both side edges of the absorber 22 are folded so that there is a gap at least between the tip portions of the folded portion, and the gap between the tip portions is A hole 15 that communicates from the surface of the absorber 22 to the surface of the diffusion sheet 23 is formed.

  By comprising in this way, the absorber with which the diffusion sheet was arrange | positioned inside can be obtained simply. The absorbent body used in the absorbent article of the present invention is not limited to the one formed by bending both side edges so as to sandwich the diffusion sheet as described above. When the body is manufactured, a diffusion sheet may be embedded therein.

  In FIG. 1 and FIG. 2, an absorbent body whose overall shape is a rectangle is used as the absorbent body before folding back both side edges, and a gap is formed between the tip portions of the folded portions of the absorbent body. The example in which the hole 15 extending in the longitudinal direction from one end edge to the other end edge of the absorber 22 is formed by providing is shown in FIG. 3 to FIG. It is also possible to use an hourglass-type absorber as shown in FIG. 5 and to fold back both side edges of the absorber so that the constricted portion of the hourglass-type absorber becomes a hole. This absorber is folded back so that the front ends of the folded portions of both side edges are in contact with both ends of the absorber, and corresponds to the constricted portion of the hourglass-shaped absorber in the central portion of the absorber. A hole is formed. Although the example which has arrange | positioned the diffusion sheet 23 to the absorber 22 longitudinal direction whole region is shown in FIG. 1, you may arrange | position only in the position which covers the hole 15 like FIG.

  FIG. 6 shows an example in which two holes 15 are formed in the absorbent body 22 of the absorbent article 1. An elongated hole 15a is formed in the urination portion so that the urination portion can be attached in close contact with the excretion site and the excretion liquid can be absorbed quickly. On the other hand, a large hole 15b is formed in the butt portion (defecation portion) for storing defecation and damming loose stool. Although one diffusion sheet 23 is arranged in the drawing, different diffusion sheets may be arranged for the urination site and the defecation site. In this case, you may arrange | position the diffused sheet colored in one or each.

  Here, FIG. 3 is a partially cutaway plan view showing another embodiment of the absorbent article of the present invention, and is a view showing a state in which the absorbent article is viewed from the top sheet side. 4 is a schematic cross-sectional view showing a cross section of the absorbent article shown in FIG. 3 cut along the line BB ′, and FIG. 5 shows the absorbent article shown in FIG. 3 along the line CC ′. It is a schematic sectional drawing which shows the cross section cut | disconnected along line. FIG. 6 is a partially cutaway plan view showing still another embodiment of the absorbent article of the present invention, and is a view showing a state in which the absorbent article is viewed from the top sheet side.

  In the absorbent article of the present invention, other than the hourglass type absorber, for example, although not shown, a known absorber such as a gourd type or a T-shape is used as the absorber before the folding. May be. Also for such an absorbent body, by folding back both side edges so that the tip of the folded portion abuts, an absorbent body in which holes corresponding to the respective outer peripheral shapes are formed can be obtained.

  About the shape of the hole part of an absorber, it is a thing of the shape where a part of excretion liquid which permeate | transmitted the top sheet and reached | attained the absorber flows in, and the excretion liquid which passed this hole penetrate | infiltrated a diffusion sheet If there is no particular limitation, for example, the hole of the absorber preferably has an elongated shape whose opening extends in the longitudinal direction of the absorber.

  Thus, by forming the hole along the longitudinal direction of the absorbent body, the absorbent article can be folded along the hole, and the absorbent article can be easily adhered to the urination site of the wearer. The fitting property with respect to the wearer can be improved. Furthermore, by configuring in this way, the fit around the legs can be improved. For this reason, the effect of preventing liquid leakage can be further improved. In addition, the flow of excretion fluid in the width direction of the absorbent body having the shortest distance from the excretion site to the outside of the absorbent article is stopped, and the excretion fluid is guided in the longitudinal direction to prevent liquid leakage from the crotch. Can do. Moreover, when diffusing excretion liquid through a diffusion sheet, excretion liquid becomes easy to diffuse, and excretion liquid can be absorbed efficiently.

  In addition, by forming a hole in the longitudinal direction, when excreted fluid is absorbed from the inside of the absorbent body via the diffusion sheet disposed inside the absorbent body, the excreted liquid is easily diffused, efficiency It can absorb the excretory fluid well.

  Examples of the absorbent material constituting the absorber include conventionally known absorbent materials commonly used for general absorbent articles such as disposable diapers, such as fluff pulp, super absorbent polymer (Super Absorbent Polymer; hereinafter) , "SAP"), hydrophilic sheets, and the like. It is possible to use wood pulp or non-wood pulp defibrated as fluff pulp, sodium polyacrylate as SAP, tissue, absorbent paper, hydrophilized nonwoven fabric as hydrophilic sheet preferable. Moreover, synthetic fibers, such as a heat-fusion fiber, may be included as a countermeasure against deformation of the absorber.

  These absorbent materials are usually used as a single-layer or multi-layer mat. Under the present circumstances, 1 type may be used independently among the said absorptive materials, and 2 or more types may be used together. Especially, what used together about 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be uniformly mixed in each mat of fluff pulp, or may be arranged in layers between the layers of the multilayer fluff pulp.

  Although not shown, the absorbent body is a sheet-like hydrophilic sheet as a carrier in order to prevent leakage of the superabsorbent polymer or to prevent deformation of the absorbent body on the production line. The structure which wraps the back surface and side surface of an absorber is generally employ | adopted, and also in the absorbent article of this invention, you may wrap an absorber with such a hydrophilic sheet | seat.

  The absorber has another diffusion sheet (hereinafter referred to as “surface-side diffusion sheet”) for diffusing liquid such as urine and body fluid on the surface side (for example, between the absorber and the top sheet). May be incidentally arranged. When this surface side diffusion sheet is attached, even if the excretory fluid is excreted at a rate higher than the absorption rate of the absorber, the surface side diffusion sheet can temporarily hold and diffuse the excretion fluid, so Has the effect of preventing leaking by flowing over the top sheet without being in time.

  As a material which comprises a surface side diffusion sheet, what was comprised similarly to the diffusion sheet arrange | positioned inside an absorber can be used. Specific examples of the material include hydrophilic and liquid-permeable materials such as woven fabric, non-woven fabric, and porous plastic. Examples of these constituent materials include polypropylene, polyethylene, polyester, rayon, and composite fibers thereof.

  Although not particularly limited, when the opening of the hole has an elongated shape extending in one direction, the width is preferably 5 to 35 mm, and more preferably 10 to 25 mm. preferable. If the width of the opening of the hole is too narrow, sufficient fit may not be obtained when the absorber is bent at the hole and pressed against the urination site. Moreover, when the width | variety of the opening part of a hole part is too narrow, excretion liquid may become difficult to pass a hole part. Furthermore, when the absorbent body is kinked or out of shape, or when the absorbent body swells, the periphery of the hole part may collapse and the hole part may be blocked, and a sufficient effect may not be obtained. . On the other hand, if the width of the opening is too wide, the absorbent capacity of the absorber at the urination site is reduced, and the absorber may be easily torn from the hole.

  For this reason, for example, as described above, when the absorbent body used in the absorbent article of the present invention is configured to be folded so that both side edges cover part of the diffusion sheet. Is preferably 5 to 35 mm, more preferably 10 to 25 mm, of the maximum width of the gap between the tip portions at the folded portion of the absorber.

  In addition, although there is no restriction | limiting in particular about the position of the hole part of an absorber, For example, it is preferable that it is formed in the wearer's excretion part at least. By comprising in this way, the excretion liquid which the wearer excreted can make it easy to pass a hole.

[1-2] Diffusion sheet:
The diffusion sheet used for the absorbent article of the present invention is disposed inside the absorber. When the excretory fluid flows into the holes of the absorber, the diffusion sheet can diffuse the excretory fluid by penetrating the diffusion sheet.

As such a diffusion sheet, a nonwoven fabric, a porous plastic film, etc. can be used. Examples of main fibers and resins constituting the diffusion sheet include polyolefins such as polypropylene and polyethylene, polyamides such as polyester and nylon, acrylic, vinylon, and composite fibers or composite resins thereof. In the case of a nonwoven fabric, a diffusion sheet can be obtained by forming these fibers by a method such as a thermal bond method, a chemical bond method such as a resin bond, a needle punch method, or a spunlace method. Particularly preferred are bulky card hot-air nonwoven fabrics formed with hot air among thermal bond methods and resin-bonded nonwoven fabrics formed with coarse eyes by chemical bond methods. Its basis weight is preferably 10 to 50 g / ^{m 2,} and still more preferably from 20 to 35 g / ^{m 2.} In the case of porous plastic film, its basis weight is preferably from 15 to 60 g / ^{m 2,} and still more preferably from 20~45g / ^{m 2.}

  The diffusion sheet used in the absorbent article of the present invention preferably has a wet strength of 3.0 N / 25 mm or more and 6.0 N / 25 mm or more in order to prevent tearing from the hole. Is more preferable. The wet strength is a value measured according to JIS P8135.

  There is no restriction | limiting in particular about the length of the width direction of a diffusion sheet. In the absorbent article 1 shown in FIG.1 and FIG.2, the example by which the diffusion sheet of the width | variety comparable as the width | variety inside the absorber by which the side edge part was turned back is arrange | positioned is shown.

  In the absorbent article of the present invention, the width of the diffusion sheet is preferably 80% or less of the width at the excretion site of the absorber. By comprising in this way, the effect of this invention can fully be acquired, and since the usage-amount of a comparatively expensive diffusion sheet can be decreased, an absorbent article can be made cheaper. it can. In addition, if the width of the diffusion sheet is too narrow, the excretion liquid cannot be sufficiently diffused, and the absorption rate of the excretion liquid may decrease. The width is preferably 50% or more, and more preferably 65% or more. By comprising in this way, excretion can be favorably diffused from the inside of an absorber.

  Moreover, although the diffusion sheet may be arrange | positioned over the whole longitudinal direction of an absorber, you may arrange | position to a part of longitudinal direction of an absorber. Although there is no particular limitation, the length in the longitudinal direction of the diffusion sheet is preferably 35% or more of the length in the longitudinal direction of the absorber, and more preferably 50% or more. By comprising in this way, an excretion site | part can be covered, excretion liquid can be spread | diffused favorably in a longitudinal direction, and an absorption rate can be improved favorably. In addition, when using a thing shorter than the length of the longitudinal direction of an absorber as a diffusion sheet, a diffusion sheet may be arranged inside an absorber at least in a field corresponding to a wearer's excretion part. preferable.

  The thickness of the diffusion sheet is not particularly limited. For example, when a porous plastic film is used as the diffusion sheet, the thickness is preferably 200 to 1500 μm, and more preferably 350 to 1200 μm. .

  When a porous plastic film is used as the diffusion sheet, the shape of the holes of the porous plastic film is funnel-shaped, that is, the size of the opening of the hole from the front surface side to the back surface side of the porous plastic film. It is preferable that the shape gradually decreases. By comprising in this way, excretion liquid can pass favorably from the hole of the porous plastic film, and liquid return is reduced.

  Normally, porous plastic films with large pore diameters are excellent in excretory fluid diffusivity, but when placed directly under the top sheet, the liquid is applied to the top sheet, which is the upper part of the non-porous film. It tends to remain, and the dryness of the surface sometimes worsens. In the absorbent article of the present invention, the diffusion sheet is disposed inside the absorber, and a hole communicating from the surface of the absorber to the surface of the diffusion sheet is formed. Even though it is arranged with a large area, it is arranged so that it is isolated from the top sheet, or in contact with the top sheet with a limited area, so the liquid residue of the top sheet is reduced as described above, Sufficient diffusibility can be exhibited.

  Moreover, the diffusion sheet used for the absorbent article of the present invention may be colored. By using the colored diffusion sheet, it becomes easy to confirm the hole portion of the absorbent body from the top sheet side, and when the wearer uses the absorbent article, the absorbent article can be easily bent along the hole portion.

[1-3] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the surface (surface located in a wearer's skin side at the time of wearing of a diaper when an absorbent article is used as a disposable diaper) may be covered. At least a part (all or a part) of the top sheet is made of a liquid-permeable material because the absorber disposed on the back side of the top sheet needs to absorb excretion fluid such as urine of the wearer.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and subjected to a hydrophilic treatment. The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials.

  Moreover, in the absorbent article of this invention, the structure by which a top sheet is arrange | positioned along the surface of an absorber, for example, opening of the surface side of the hole 15 formed in the absorber 22, as shown in FIG. For example, the top sheet covers the surface of the absorber and is exposed from the inner surface of the hole of the absorber and the hole. The diffusion sheet is covered, and the top sheet and the diffusion sheet may be joined at the opening on the surface side of the diffusion sheet.

  For example, in the absorbent article 1 shown in FIG. 7, the top sheet 18 covers the surface of the absorber 22, and the diffusion sheet 23 exposed from the inner surface of the hole 15 of the absorber 22 and the hole 15. In this example, the top sheet 18 and the diffusion sheet 23 are joined at the opening on the surface side of the diffusion sheet, that is, inside the absorber 22.

  By comprising in this way, an absorber becomes easy to bend along a hole, and the fit nature to a wearer can further be improved. In addition, since the excretory fluid that has passed through the top sheet disposed in the hole directly permeates the diffusion sheet, more diffusion fluid can be diffused by the diffusion sheet, and the absorption rate of the excretory fluid is further improved. be able to. Furthermore, since the top sheet is disposed along the hole, it is possible to effectively prevent the hole from being deformed.

  Here, FIG. 7 is a cross-sectional view showing still another embodiment of the absorbent article of the present invention. In addition, in FIG. 7, about the thing comprised similarly to each element of the absorbent article shown in FIG. 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.

[1-4] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the surface located in a wearer's clothing side may be covered when the back surface of an absorber, for example, an absorbent article is used as a disposable diaper. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the excretion liquid such as urine from leaking to the outside.

  Examples of the liquid-impermeable material constituting the back sheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impermeable but moisture permeable. Therefore, when used as a disposable diaper, the inside of the diaper There is an advantage that stuffiness can be prevented.

  In addition, when using the absorbent article of this invention as a disposable diaper, you may bond a sheet | seat material (cover sheet | seat) to this back sheet on the outer surface side. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[2] Disposable diapers:
Next, an embodiment in which the absorbent article of the present invention is used as a disposable diaper will be described. The absorbent article of the present invention can be applied to disposable diapers such as tape-type diapers, pants-type diapers, and urine pads. Hereinafter, a one-piece type tape diaper will be described as an example.

  In the present specification, the “tape diaper” refers to the absorbent body 22, the top sheet 18 made of at least a part of a liquid permeable material, and a liquid impervious like the tape diaper 100 shown in FIG. 8. A back sheet 20 made of material, and composed of a front body 2, a crotch 4 and a back body 6, and arranged so as to extend from the left and right side edges 6 a and 6 b of the back body 6. The disposable diaper further includes a fastening tape 7 for fixing the back body 6 to the front body 2.

  Further, in the present specification, the term “pants-type diaper” refers to the side edges corresponding to the front body 2 and the back body 6 (side edges 2a, 6a, side) as in the pants-type diaper 110 shown in FIG. By joining the edge portions 2b and 6b), a joint portion 8, one waist opening portion 10 and a pair of leg opening portions 12a and 12b are formed, which means a diaper configured in a pants shape in advance. To do.

  The “one-piece type” is different from the two-piece type described later in that it includes a top sheet, a back sheet, and an absorbent body. However, the absorbent body that absorbs and retains the gap between the top sheet and the back sheet. It means a type of diaper that is integrated (built-in) and configured integrally with at least one of a top sheet and a back sheet that have a mounting function.

  In addition, in this specification, “front body” means a part that covers the abdomen (front of the body) of the wearer when a diaper is worn on the wearer, and “inseam” means that the wearer wears a diaper. When the wearer wears a diaper, the part covering the inseam of the wearer means the part covering the back side (back of the body) of the wearer.

[2-1] Configuration of tape-type diaper:
The tape-type diaper which is an embodiment of the absorbent article of the present invention includes an absorbent body configured in the same manner as the absorbent body constituting the absorbent article described so far.

  That is, in the tape-type diaper according to the present embodiment, the absorbent body is one in which a diffusion sheet is disposed inside the absorbent body. Further, the absorbent body is separated from the surface of the absorbent body by the inside of the absorbent body. The hole part connected to the surface of the diffusion sheet arrange | positioned in is formed.

  The tape-type diaper shown in FIG. 8 is a tape-type diaper 100 including an absorbent body 22 configured in the same manner as the absorbent body used in the absorbent article shown in FIG. That is, the diffusion sheet 23 is disposed inside the absorber 22, and the absorber 22 has a hole 15 that communicates from the surface of the absorber 22 to the surface of the diffusion sheet 23 disposed inside the absorber 22. Is formed.

  The tape-type diaper of this embodiment is a disposable diaper excellent in the excretion fluid absorbability. That is, excreted liquid such as urine is absorbed at the urine site of the absorber, and part of the excreted liquid passes through the holes of the absorber and permeates the diffusion sheet, and passes through this diffusion sheet. And absorbed from the inside of the absorber. Thus, since excretory fluid is absorbed in a wider area, it is excellent in absorbency.

  In addition, as the absorbent body, the top sheet, and the back sheet constituting the tape-type diaper of the present embodiment, those configured similarly to the respective constituent elements in the absorbent article of the present invention described so far are preferably used. Can do.

  Moreover, in the tape-type diaper of this embodiment, the top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials. For example, the form which comprises the top sheet arrange | positioned at the upper surface part of an absorber and the top sheet arrange | positioned at the part of the side flap of a diaper by a different sheet | seat is also utilized frequently. The tape-type diaper 100 shown in FIG. 8 has a top sheet 18 (center sheet 18a) made of a liquid-permeable material at the center of the diaper, and the side flap 5 portion of the diaper is resistant to liquid permeation. It is the example which has arrange | positioned the top sheet 18 (side sheet 18b) which consists of ventilation water-repellent material which shows.

  Further, for example, the back sheet may be configured to match the outer shape of the diaper, or a sheet material (cover sheet) may be bonded to the outer surface side of the back sheet. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet. In addition, in the tape-type diaper 100 shown in FIG. 8, the example which has arrange | positioned the back seat | sheet 20 of the shape corresponding to the external shape of a diaper is shown. Moreover, the back sheet should just be arrange | positioned in the range which covers an absorber at least. By disposing the back sheet in a range slightly larger than the absorbent body and configuring the side flap portion corresponding to the side portion of the wearer with the cover sheet and the side sheet, a disposable diaper with better breathability can be obtained. You may comprise a side flap part with a separate nonwoven fabric.

[2-2] Solid gather:
In the tape type diaper of this embodiment, in order to prevent the side leakage of the urine excreted by the wearer, a three-dimensional gather may be provided. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather becomes a breakwater, and side leakage from the opening around the leg of the diaper can be effectively prevented.

  The structure used for the conventional disposable diaper and other absorbent articles can be adopted as the structure of the three-dimensional gather. For example, a stretchable material (a three-dimensional gathered stretchable material) disposed on a part of the water-repellent sheet material and a sheet (gather) formed on the sheet material by the three-dimensional gathered stretchable material can be suitably used.

  The three-dimensional gather may be formed of a sheet material that is completely different from the top sheet and the back sheet, but may be formed by folding back a top sheet such as a center sheet or a side sheet. For example, the tape-type diaper 100 shown in FIG. 8 is an example in which the three-dimensional gather 26 (26a, 26b) is formed by folding back the side sheet 18b. However, the three-dimensional gather may be formed by folding back a member other than the top sheet such as a back sheet.

  In order to prevent leakage from the crotch part, this three-dimensional gather may be formed at least in the crotch part, but may be formed in the front body or the back body. For example, in the tape-type diaper 100 shown in FIG. 8, a pair of three-dimensional gathers 26 (26a, 26b) are continuously formed from the crotch part 4 to both the front body 2 and the back body 6 along the longitudinal direction of the diaper. An example is shown. Further, at least one pair of solid gathers must be formed, but two or more pairs may be formed.

  The three-dimensional gather may be an inward gather that tilts toward the inside of the diaper, or may be an outward gather that tilts toward the outside of the diaper. Moreover, it can also be set as the three-dimensional gathers (C fold gather, Z fold gather, etc.) which formed the bending part and the folding | turning part in a part of height direction. For example, the tape-type diaper 100 shown in FIG. 8 is an example in which the three-dimensional gathers 26 (26a, 26b) are inwardly gathered.

[2-3] Fastening tape:
A fastening tape is a tape for making a wearer wear a tape type diaper. There are no particular restrictions on the shape and structure of the diaper so long as it can be attached to the wearer by fixing the back and abdomen of the diaper to a pant-type diaper.

  For example, a tape-type diaper 100 shown in FIG. 8 is one in which two pairs of fastening tapes 7 are arranged on both side edges of the back body 6. These fastening tapes 7 are configured to be capable of being attached to a front patch 11 disposed on the outer surface of the front body 2. By sticking the fastening tape 7 to the front patch 11, the back body 6 and the front body 2 of the diaper are fixed to each other, and the diaper can be attached to the wearer.

  Moreover, although the tape-type diaper 100 shown in FIG. 8 is provided with two pairs of fastening tapes 7, the same effect can be obtained even if the fastener tape 7 is provided with only one pair or three or more pairs. be able to. Moreover, the double tape which the two fastening parts extended to the front-end | tip of a pair of fastening tape 7 may be sufficient.

  In the present invention, as the fastening tape, any of an adhesive tape, a mechanical fastener and the like may be used. The mechanical fastener is, for example, a convex member (hook member) having a large number of protrusions (such as hooks, mushrooms, hooks, etc.) formed on the surface and loop fibers disposed on the surface, or short fibers. A combination of a concave material (loop material) such as a configured nonwoven fabric is often used. In this fastener, the hook material is overlapped on the surface of the loop material, and a large number of protrusions of the hook material are engaged with the surface of the loop material, so that both members can be peeled and firmly fixed. It can be done.

[2-4] Various elastic materials:
In a tape-type diaper, it is preferable to arrange an elastic material around the legs and arrange an elastic material around the waist.

  The leg circumference elastic material is an elastic material arranged along the leg circumference opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it is difficult to form a gap around the leg, and liquid leakage from the leg opening can be effectively prevented. Further, when the leg stretchable material is disposed, the leg stretchable material contracts on both sides of the absorbent body when changing the diaper, so that the vicinity of the crotch portion is deformed into a bowl shape and a recess is formed. For this reason, urine and body fluid accumulate in the concave portion, and the diaper can be easily replaced without spilling urine and body fluid.

  For example, a tape-type diaper 100 shown in FIG. 8 is an example in which leg gathers are formed by arranging two leg elastic members 40 linearly along the longitudinal direction of the diaper. The leg-around elastic member 40 is made of rubber thread. However, the leg-surrounding elastic members are not necessarily arranged linearly, and may be arranged in a curved line along the curve of the leg-periphery opening, for example.

  The leg-surrounding elastic member 40 is preferably formed in a portion outside the upright line 46 of the three-dimensional gather 26, for example, like a tape-type diaper 100 shown in FIG. With such a configuration, it is possible to improve the wearing feeling and wearing feeling of the crotch part while ensuring a sufficient leakage preventing effect of the three-dimensional gather.

  Note that the tape-type diaper 100 shown in FIG. 8 shows an example in which the shape, arrangement position, number of arrangements, etc. of the leg-surrounding elastic members 40 are bilaterally symmetric, but those that are bilaterally asymmetric are also included in the scope of the present invention. It is. And in the tape-type diaper 100 shown in FIG. 8, although the example in which the leg periphery elastic material 40 was arrange | positioned per one side was shown, only one may be arrange | positioned and three or more may be arrange | positioned. Good. Further, when using a plurality of leg-surrounding stretchable materials, the thickness, stretch rate, etc. may be set as appropriate according to the purpose, and it is not necessary to use the same for all.

  The waist elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist, so that liquid leakage from the waist can be prevented, the fit of the diaper to the wearer is good, and the diaper is prevented from falling down.

  In addition, the tape-type diaper 100 shown in FIG. 8 is the example which has arrange | positioned the waist surrounding elastic material 42 which consists of a strip-shaped urethane film along the edge of the back body 6 of a diaper. This belt-like waist elastic member 42 may be made of a stretchable foam such as urethane foam. In the illustrated example, the waist elastic member 42 is disposed only on the back body (back side), but the waist elastic material may be disposed on the front body (abdominal side).

  For these stretchable materials, after considering the degree of shrinkage of gathers, etc., the constituent material, the elongation rate of the material, the stretched state at the time of fixing, etc. may be determined.

  As an elastic material, the elastic material which has been used with the conventional disposable diaper can be used conveniently. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc., as well as thread rubber and flat rubber made of elastic materials such as natural rubber and synthetic rubber (urethane rubber, etc.). .

  The stretchable material is preferably fixed in the stretched state in order to exert a sufficient stretch force. For example, when the elastic material is natural rubber or synthetic rubber, it is preferably fixed in a stretched state of 110 to 400%, and more preferably fixed in a stretched state of 200 to 300%. By fixing in the extended state in such a range, a sufficient stretching force can be applied.

  The stretchable material as described above is fixed to other constituent members of the diaper by an adhesive or other means. The fixing method may be, for example, adhesion using a hot melt adhesive or other highly fluid adhesive, or may be welding by heat such as heat sealing or ultrasonic waves.

[2-5] Tape type diaper manufacturing method:
Hereinafter, the manufacturing method of the tape type diaper which is an absorbent article of this invention is demonstrated in the example in the case of manufacturing the tape type diaper 100 shown in FIG. First, the absorber used for the tape-type diaper 100 is manufactured. In this absorbent body, a diffusion sheet is disposed inside the absorbent body, and a hole is formed that communicates from the surface of the absorbent body to the surface of the diffusion sheet disposed inside the absorbent body.

  Such an absorber is formed by folding both side edges of the absorber so as to cover a part of the diffusion sheet arranged on the surface in a state where the diffusion sheet is arranged on one surface of the absorber. Can do. When folding both side edges of the absorbent body, it is folded back so that there is a gap at least between the front end portions in the folded portion of both side edge portions of the absorbent body. The hole portion of the absorber is formed. In addition, although such an absorber can also be formed one by one by the above-mentioned method, for example, after disposing a diffusion sheet on the surface of the long absorbent body using this long absorbent body, By folding the side edges of the long absorbent body to form an absorbent continuous body containing a diffusion sheet inside the long absorbent body, and then cutting the absorbent continuous body to a predetermined length It can also be formed continuously.

  After obtaining the absorbent body 22 of the tape-type diaper 100 shown in FIG. 8 by the above method, the obtained absorbent body 22 is placed on the upper surface of a long sheet material (backsheet material) that is the material of the backsheet 20. Place. Moreover, the leg periphery elastic material 40 is mounted in the site | part corresponded to the leg periphery of a diaper. Further, by placing a long sheet material (top sheet material) as a material of the top sheet 18 on these upper surfaces, a laminate (diaper continuous body) serving as an intermediate body of the diaper is obtained.

  In addition, two types of top sheet materials are used: a top sheet material corresponding to the center sheet 18a and a top sheet material corresponding to the side sheet 18b. A three-dimensional gather 26 is formed by providing a folded portion on the sheet material corresponding to the side sheet 18b.

  In the diaper continuous body obtained as described above, a portion corresponding to the opening around the leg of the diaper is cut out in an arc shape and cut (R cut) to form an opening around the leg. Finally, the fastening tape 7 is attached, and the continuous diaper is cut into individual diapers, whereby the tape-type diaper 100 is manufactured.

  In addition to the above-described method, a fastening tape is previously attached to the top sheet material, and a diffusion sheet, an absorbent body and a leg-around elastic material are placed on the upper surface of the back sheet material, and further, the fastening is performed on the upper surface. A diaper continuous body may be obtained by placing a top sheet material provided with a tape. The series of steps as described above can be continuously performed by mechanical means. For example, by adopting a method / apparatus such as continuously feeding a long sheet material from a roller, continuous production of a tape-type diaper becomes possible, which contributes to improvement of productivity.

[2-6] Applicable objects for disposable diapers:
The application object of the disposable diaper which is an absorptive article of the present invention is not restricted to the above-mentioned 1 piece type tape type diaper, for example, can also be applied to a 2 piece type tape type diaper. Moreover, it is applicable also to a 1 piece type and 2 piece type underpants type diaper. Moreover, it can also be applied to a urine pad that is used by being placed in a crotch part such as a diaper. That is, also in these disposable diapers, the same effects as those of the one-piece type tape diapers described so far are obtained by adopting the same configuration as the absorbent body configured in the same manner as the absorbent articles described so far. Can be obtained.

  “Two-piece type” means an absorbent main body that functions to absorb and retain the excrement of the wearer (absorption / holding function) and an exterior member that functions to encapsulate the wearer's body (mounting function) And a diaper of the type in which an absorbent main body is disposed inside the exterior member.

  The absorbent main body is a member including an absorbent body, a top sheet, and a back sheet as constituent elements, and is manufactured by sandwiching the absorbent body between the top sheet and the back sheet and sealing the peripheral edge of the absorbent body. Can do. An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

  On the other hand, the exterior member is a member having a mounting function for encapsulating the wearer's body, and specifically, is a sheet-like member that forms the front body, the crotch part, and the back body. The two-piece type tape-type diapers and pants-type diapers absorb and retain the excretion fluid of the wearer, and the absorption / retention function is exclusively performed by the absorbent main body. There is no need to use an impermeable material. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

  The absorbent article of the present invention is a urine pad for absorbing excretory fluid by being placed inside a tape-type or pants-type disposable diaper or clothing for infants or adults such as the elderly or the disabled. It can be used as a sanitary napkin that absorbs blood, a sheet of cage that absorbs cage, and the like.

It is a partially cutaway top view showing one embodiment of an absorbent article of the present invention, and is a figure showing the state where the absorbent article was seen from the top sheet side. It is a schematic sectional drawing which shows the cross section which cut | disconnected the absorbent article shown in FIG. 1 along the A-A 'line. It is a partially notched top view which shows other embodiment of the absorbent article of this invention, and is a figure which shows the state which looked at the absorbent article from the top sheet side. It is a schematic sectional drawing which shows the cross section which cut | disconnected the absorbent article shown in FIG. 3 along the B-B 'line. It is a schematic sectional drawing which shows the cross section which cut | disconnected the absorbent article shown in FIG. 3 along the C-C 'line. It is a partially notched top view which shows other embodiment of the absorbent article of this invention, and is a figure which shows the state which looked at the absorbent article from the top sheet side. It is sectional drawing which shows other embodiment of the absorbent article of this invention. It is a partially notched top view which shows the tape-type diaper as other embodiment of the absorbent article of this invention, is a figure which expand | deploys a tape-type diaper and shows the state seen from the top sheet side. It is a schematic perspective view which shows the underpants type diaper as other embodiment of the absorbent article of this invention, and is a figure which shows the state which looked at the underpants type diaper from the front.

Explanation of symbols

1: Absorbent article, 2: Front body, 2a, 2b: Side edge, 4: Crotch, 5: Side flap, 6: Rear body, 6a, 6b: Side edge, 7: Fastening tape, 8: Joining Part, 10: opening around the waist, 11: front patch, 12, 12a, 12b: opening around the leg, 15, 15a, 15b: hole, 18: top sheet, 18a: center sheet, 18b: side sheet, 20 : Back sheet, 22: Absorber, 23: Diffusion sheet, 26, 26a, 26b: Three-dimensional gather, 36, 36a, 36b: Three-dimensional gather stretchable material, 40: Stretch material around leg, 42: Stretch material around waist, 46: Standing wire, 100: tape-type diaper, 110: pants-type diaper.

Claims (6)

An absorber, a topsheet that is arranged so as to cover the surface of the absorber, and at least a part is made of a liquid-permeable material; and a backsheet that is arranged on the back surface of the absorber and is made of a liquid-impermeable material; An absorbent article comprising:
The absorber has a diffusion sheet disposed inside the absorber, and the absorber has the diffusion sheet disposed inside the absorber from the surface of the absorber. Absorbent article in which a hole communicating with the surface is formed. In the state where the diffusion sheet is disposed on one surface, the absorber is configured to be folded back so that both side edges cover a part of the diffusion sheet,
The side edge portions of the absorber are folded back so that a gap is formed at least at a part between the tip portions of the folded portion, and the diffusion sheet is formed from the surface of the absorber by the gap between the tip portions. The absorptive article according to claim 1 in which said hole which is open for free passage is formed.   The absorptive article according to claim 2 whose maximum width of the crevice between said tip parts in the turned part of said absorber is 5-35 mm.   The said diffusion sheet is an absorbent article as described in any one of Claims 1-3 arrange | positioned inside the said absorber in the area | region corresponding to a wearer's excretion site | part at least.   The absorptive article according to any one of claims 1 to 4 in which said hole of said absorber is formed in a field corresponding to a wearer's excretion part at least.   The top sheet covers the surface of the absorber, covers the inner peripheral surface of the hole of the absorber, and the diffusion sheet exposed from the hole, and the top sheet The said diffusion sheet is an absorbent article as described in any one of Claims 1-5 joined in the opening part by the side of the surface of the said diffusion sheet.

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