JP2010119745A - Disposable diaper - Google Patents

Abstract

An object of the present invention is to provide a disposable diaper in which the indicator means changes color according to the amount of excreted urine and the amount of excreted urine can be accurately grasped.
SOLUTION: Indicator means 22 for notifying urination by a color change is arranged between a back sheet 12 and an absorber 13. The indicator means 22 includes an opaque film 23 in which one or two or more apertures 25 through which liquid can pass are formed. Water-soluble ink 26 is applied to the absorber facing surface 23 a of the opaque film 23. It is preferable that the indicator means 22 further includes a hydrophilic fiber sheet 24 disposed on the opposite surface side of the opaque film 23.
[Selection] Figure 4

Description

  The present invention relates to a disposable diaper provided with indicator means for informing urination.

  Various disposable diapers having indicator means for informing urination are known. For example, the indicator is formed on the hydrophilic base sheet, the first coating layer formed on one side thereof, which becomes bright when wetted with urine, and the other side or the upper surface of the first coating layer, There has been proposed a disposable diaper that is configured to conceal one paint layer and to become transparent when wetted with urine. The 2nd coating material layer in an indicator is joined to the inner surface of a back sheet intermittently (refer to patent documents 1).

  The indicator means has a printing ink layer that becomes wet and becomes apparent, and an ink coating layer that is positioned between the ink layer and the back sheet and covers the ink layer, and the ink coating layer is a surfactant. Disposable diapers containing the same have also been proposed. An indicator means is arrange | positioned between a back surface sheet and a liquid absorptive core (refer patent document 2).

  Furthermore, the indicator is formed from a liquid-permeable intermediate sheet obtained by applying a surfactant to a hydrophobic fiber nonwoven fabric and performing a hydrophilic treatment, and a water-soluble colorant that forms a given shape visible from the outside of the back sheet. A disposable diaper is also proposed in which the intermediate sheet is interposed between the back sheet and the absorbent core, and the colorant is applied to the surface of the intermediate sheet facing the back sheet (see Patent Document 3).

Japanese Patent Laid-Open No. 9-140742 JP-A-9-299401 JP 2003-70837 A

  However, the indicator means described in these patent documents bleeds with a small amount of urine diffused in the absorber, so that there is a problem that the indicator is discolored even though the capacity of the absorber still remains. Specifically, in the indicator means described in Patent Document 1, the base sheet on which the first paint layer and the second paint layer are formed is hydrophilic. So that it is difficult to accurately display the amount of excreted urine. In the indicator described in Patent Document 2, the ink coating layer that covers the ink layer is in close contact with the ink layer, and the surfactant is contained in the ink coating layer. The surfactant contained in the coating layer spreads and spreads, and it is not easy to accurately display the amount of excreted urine. Since the indicator described in Patent Document 3 is composed of a hydrophilic sheet as in Patent Document 1 described above, urine soaking still occurs and the amount of excreted urine can be accurately displayed. Not easy.

  The objective of this invention is providing the disposable diaper which can eliminate the fault which the prior art mentioned above has.

The present invention has a top sheet located on the side close to the wearer's skin, a back sheet located on the side far from the wearer's skin, and an absorber disposed between both sheets, A disposable diaper in which indicator means for informing urination by a change in color is arranged between the absorbent body,
The indicator means comprises a disposable diaper comprising an opaque film having one or more apertures through which a liquid can pass, wherein water-soluble ink is applied to the absorber-facing surface of the opaque film. is there.

  According to the present invention, since the indicator means changes color according to the amount of excreted urine, the amount of excreted urine can be accurately grasped.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a mounted state of an embodiment of the disposable diaper of the present invention. 2 is a state in which the diaper shown in FIG. 1 is developed, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The diaper 10 shown in FIGS. 1 to 3 is of a so-called unfolded type (tape-clamping type). The diaper 10 has a top sheet 11 located on the side close to the wearer's skin, a back sheet 12 located on the side far from the wearer's skin, and an absorbent body 13 disposed between both sheets 11 and 12. is doing. The diaper 10 in the unfolded state has a substantially vertically long shape. The diaper 10 has a dorsal region A on one end side in the longitudinal direction and a ventral region B on the other end side. Further, a crotch region C is provided between the dorsal region A and the ventral region B.

  The absorber 13 extends from the back region A to the ventral region C of the diaper 10. The absorber 13 is sandwiched and fixed by the top sheet 11 and the back sheet 12. The top sheet 11 and the back sheet 12 extend from the front and rear end edges of the absorbent body 13 in the front-rear direction to form waist flaps 14, 14. Further, the top sheet 11 and the back sheet 12 extend in the horizontal direction from the left and right side edges of the absorber 13 to form leg flaps 15 and 15.

  The leg flap 15 is provided with leg elastic strands 17 for allowing the diaper wearer to fit the diaper 10 around the wearer's legs. The leg elastic strands 17 are disposed on the left and right sides of the diaper 10 and extend in the longitudinal direction of the diaper 10. One end of the leg elastic strand 17 terminates in the vicinity of the boundary portion between the back region A and the crotch region C of the diaper 10. The other end of the leg elastic strand 17 terminates near the boundary between the ventral region B and the crotch region C of the diaper 10. However, in some cases, the ends of the leg elastic strands 17 may be located in the dorsal region A and / or the ventral region C. Due to the contraction of the leg elastic strands 17, gathers are formed in the leg flaps 15.

  A pair of three-dimensional guard forming sheets 16 are arranged on the left and right sides of the diaper 10 on the surface sheet side, and three-dimensional guards 18 are respectively formed. A three-dimensional guard elastic member 19 is disposed at the free end of the three-dimensional guard 18 to form a gather. The aforementioned leg elastic strands 17 are stretched and sandwiched and fixed between the three-dimensional guard forming sheet 16 and the back sheet 12.

  A pair of fastening tapes 20, 20 are attached to the left and right side portions of the waist flap 14 in the back region A of the diaper 10. A fastening means 20 a for fastening the fastening tape 20 to the back sheet 12 is provided on the surface of the fastening tape 20, that is, the surface of the diaper 10 on the same side as the top sheet 11. Examples of the fastening means 20a include a hook member or a loop member of a mechanical fastener, an adhesive, and the like.

  A waist elastic strand 21 extending in the width direction of the diaper 10 is disposed in an extended state between the fastening tapes 20 and 20 of the waist flap 14 in the back side region A of the diaper 10. Similarly, waist elastic strands 21 extending in the width direction of the diaper 10 are also arranged in an extended state on the waist flap 14 in the ventral region B of the diaper 10. The waist elastic strand 21 is sandwiched and fixed between the top sheet 11 and the back sheet 12. A gather is formed in the waist flap 14 by the shrinkage of the waist elastic strand 21.

  As a constituent material of each member which comprises the diaper 10, the thing similar to what was conventionally used for this kind of diaper can be used. For example, as the surface sheet 11, liquid permeable sheet materials such as various nonwoven fabrics can be used. When the constituent fibers of the nonwoven fabric are hydrophobic, the nonwoven fabric can be subjected to a hydrophilic treatment. As the back sheet 12, a liquid-impermeable sheet material, for example, a sheet made of various synthetic resins can be used. In addition to being liquid impermeable, this sheet is preferably moisture permeable. As the absorbent body 13, for example, a laminate of fluff pulp and superabsorbent polymer particles wrapped with tissue paper or the like can be used. As the three-dimensional guard forming sheet 16, a water-repellent nonwoven fabric or the like can be used.

  As shown in FIG. 2, indicator means 22 for notifying urination is disposed between the back sheet 12 and the absorber 13. The indicator means 22 notifies urination by a change in color. The change in the color of the indicator means 22 is visible from the outside through the back sheet 12.

  FIG. 4 shows an exploded perspective view of the indicator means 22. The indicator means 22 includes an opaque film 23 and a transfer sheet 24. The opaque film 23 and the transfer sheet 24 are vertically long rectangles having the same shape. The indicator means 22 is arranged in a region from the crotch region C to the ventral region B of the diaper 10 with its longitudinal direction coinciding with the longitudinal direction of the diaper 10.

  The opaque film 23 has an absorber facing surface 23a and a transfer sheet facing surface 23b. The opaque film 23 is substantially water-impermeable at portions other than the openings 25 described later. The transfer sheet 24 has an opaque film facing surface 24a and a back sheet facing surface 24b. In a state where the indicator means 22 is incorporated in the diaper 10, the transfer sheet facing surface 23 b of the opaque film 23 and the opaque film facing surface 24 a of the transfer sheet 24 abut against each other. Further, the absorber facing surface 23 a of the opaque film 23 faces the absorber 13, and the back sheet facing surface 24 b of the transfer sheet 24 faces the back sheet 12.

  The opaque sheet 23 and the transfer sheet 24 may be in a non-bonded state, or a part thereof may be in a bonded state. Depending on the case, the whole opposing surface of both sheets 23 and 24 may be in a joined state. In any case, it is preferable that some of the constituent fibers of the transfer sheet 24 exist in the opening 25. This is because the water-soluble ink 26 dissolved in urine is easily drawn into the transfer sheet 25 by capillary action.

  One or two or more apertures 25 are formed in the opaque film 23 (three in FIG. 4). The opening 25 has a size that allows the liquid to pass therethrough. The permeation of the liquid means that the permeation of the liquid is possible under body pressure applied to the opaque film 23 while the diaper 10 is worn. The openings 25 are arranged at substantially equal intervals along the longitudinal direction of the film 23 at the position of the substantially central portion in the width direction of the opaque film 23. The opening 25 shown in FIG. 4 has a circular shape. However, the shape of the opening 25 is not limited to a circle, and various shapes such as a polygon such as a triangle, a rectangle, and a hexagon, and a star shape can be employed. Further, as the shape of the opening 25, two or more different shapes may be adopted. Furthermore, even if all the openings 25 have the same shape, the sizes of the openings 25 may be made similar to each other.

  A water-soluble ink 26 is applied around each opening 25. The water-soluble ink 26 is applied to the absorber facing surface 23 a of the opaque film 23. In FIG. 4, a state in which the water-soluble ink 26 is concentrically applied over the entire area around the opening 25 is shown, but the pattern in which the water-soluble ink 26 is applied is not limited thereto. The water-soluble ink 26 applied around each aperture 25 may be the same color, or the color of the water-soluble ink 26 may be different for each aperture 25. Further, when attention is paid to one opening 25, the water-soluble ink 26 applied to the opening 25 may be one color or different colors. In any case, the color of the water-soluble ink 26 is preferably different from the color of the transfer sheet facing surface 23b in the opaque film 23. When the water-soluble ink 26 is eluted in urine by urination and flows out to the transfer sheet 24 side through the opening 25, the color change becomes large, and it is possible to easily recognize from the outside that the urine has been urinated. Is from

  In the vicinity of each opening 25, a display 27 indicating the time for changing the diaper is provided. This display 27 is provided so as not to disappear due to urination. For example, the display 27 can be formed using water-insoluble ink. The display 27 may be formed on any of the absorber facing surface 23a and the transfer sheet facing surface 23b of the opaque film 23 as long as it can be visually recognized from the outside.

  The degree of opacity of the opaque film 23 is preferably such that the color of the water-soluble ink 26 is not visible from the outside in the diaper 10 before urine is excreted. As a result, as will be described later, when the water-soluble ink 26 is eluted in the urine by urination and flows out to the transfer sheet 24 through the opening 25, the color change becomes large, and it is easy to externally indicate that urination has occurred. It becomes possible to visually recognize. Therefore, the degree of opacity of the opaque film 23 is appropriately selected according to the color of the water-soluble ink 26 used. The opaque film 23 is generally composed of a thermoplastic resin, and the degree of opacity of the film 23 can be adjusted by its thickness and the type of filler.

  The transfer sheet 24 used together with the opaque film 23 is disposed on the back sheet facing surface side of the opaque film 23. The transfer sheet 24 is used to receive the ink 26 when the water-soluble ink 26 is eluted in the urine and flows out through the opening 25 by urination. By using the transfer sheet 24, the color change of the ink 26 that has flowed out to the transfer sheet 24 side through the opening 25 becomes remarkable. For this purpose, the transfer sheet 24 is preferably composed of a hydrophilic sheet containing hydrophilic fibers.

  Examples of the hydrophilic fibers contained in the transfer sheet 24 include natural fibers such as pulp and cotton; semi-synthetic fibers such as rayon; those obtained by adding a hydrophilizing agent to hydrophobic synthetic fibers made of polyethylene, polypropylene, polyethylene terephthalate, and the like. Is used. These fibers may be short fibers or long fibers (continuous fibers). Moreover, there is no restriction | limiting in particular in the thickness of these fibers. In general, if the thickness is about 1 to 5 dtex, satisfactory results are obtained.

  In addition to the hydrophilic fibers, the transfer sheet 24 may contain hydrophobic fibers as long as the hydrophilicity of the transfer sheet 24 is not impaired. Although depending on the type of fiber, the upper limit of the amount of hydrophobic fiber added is about 50% by weight. As the transfer sheet 24, for example, paper or non-woven fabric is preferably used, but is not limited thereto.

  The transfer sheet 24 preferably has the same color as the opaque film 23 described above. Here, “same color” means similar hue, lightness, and saturation. In particular, those close in hue and lightness can be preferably used.

Depending on the type of fiber, the transfer sheet 24 has a basis weight of 5 to 100 g / m ² , particularly 10 to 30 g / m ^2. This is preferable because the ink 26 can be sufficiently received when it flows out through the hole 25.

  FIGS. 5A to 5D schematically show the state of color change of the indicator means 22 due to urination. Among these drawings, FIG. 5A shows a state before urine is excreted in the diaper 10. In this state, the water-soluble ink 26 is located on the absorber-facing surface of the opaque film 23. Since the opaque film 23 is opaque to such an extent that the water-soluble ink 26 cannot be visually recognized from the outside, the color of the water-soluble ink 26 cannot be visually recognized from the outside of the diaper 10 in this state. Therefore, the display 27 is only visible from the outside.

  When urine is excreted in the diaper, as shown in FIG. 5B, the urine flows down to the crotch portion of the absorber 13 by the action of gravity and is absorbed and fixed there. Urine oozes from the absorber 13 due to the body pressure of the wearer and so forth, and dissolves the water-soluble ink 26 located at the bottom. The ink 26 dissolved in the urine flows out to the transfer sheet 24 side through the opening 25 located at the lowermost side. The ink 26 that has flowed out is absorbed by the transfer sheet 24 and forms a circular pattern 28 on the transfer sheet 24. The reason for the circular shape is that the opening 25 is circular. That is, the shape of the pattern 28 substantially corresponds to the shape of the opening 25. As a result, a circular pattern 28 of a color corresponding to the color of the water-soluble ink 26 appears just above the display 27 positioned at the lowermost side. This pattern 28 can be visually recognized from the outside of the diaper 10. By visually recognizing this pattern 28, it can be known that a certain amount of urine has been absorbed by the diaper 10.

  If urine excretion occurs again, the amount of urine absorbed by the absorber 13 increases as shown in FIG. 5C, and the urine dissolves the water-soluble ink 26 located second from the bottom. The ink 26 dissolved in the urine flows out to the transfer sheet 24 side through the opening 25 located second from the bottom. The ink 26 that has flowed out is absorbed by the transfer sheet 24 and forms a circular pattern 28 on the transfer sheet 24. As a result, a circular pattern 28 of a color corresponding to the color of the water-soluble ink 26 appears just above the display 27 positioned second. By visually recognizing this pattern 28, it can be known that a considerable amount of urine has been absorbed by the diaper 10.

  When the urine is further excreted, the urine dissolves the water-soluble ink 26 located on the uppermost side as shown in FIG. The ink 26 dissolved in the urine flows out to the transfer sheet 24 side through the opening 25 located on the uppermost side. The outflowed ink 26 forms a circular pattern 28 on the transfer sheet 24. As a result, a circular pattern 28 of a color corresponding to the color of the water-soluble ink 26 appears just above the display 27 located on the uppermost side. By visually recognizing this pattern 28, it is possible to know that a large amount of urine has been absorbed so that the diaper 10 must be replaced.

  Thus, according to the diaper 10 of the present embodiment, the pattern 28 can be easily visually recognized from the outside of the diaper 10 through the back sheet 12. By visually recognizing this pattern 28, the amount of urine absorbed in the diaper 10 can be accurately known, and the replacement time of the diaper 10 can be appropriately determined.

As described above, the size of the opening 36 is such that the liquid can pass therethrough. In particular, the color change caused by the indicator means 22 can be reliably recognized from the outside of the diaper 10. From the viewpoint of making it possible, the size of the opening 25 is preferably 0.01 to 10 cm ² , particularly preferably 0.1 to ⁴ cm ² . Further, 0.01～15Cm ² the area of the water-soluble ink 26 applied to the periphery of the opening 25, it is particularly preferable to 0.02~6cm ^2. Furthermore, it is preferable that the coating basis weight of the water-soluble ink 26 1 to 100 g / m ^2, particularly 5 to 50 g / m ^2.

  The type of the water-soluble ink 26 to be used is not particularly limited, but it is preferable to use a color different from that of the sheet 24 in consideration of solubility in urine, color development in the transfer sheet 24, and the like. The color of another system means a color other than the color of the same system described above.

  Next, a second embodiment of the present invention will be described with reference to FIG. Regarding the present embodiment, the same description as that of the above-described embodiment is appropriately applied to points that are not particularly described. In FIG. 6, the same members as those in FIGS. 1 to 5 are denoted by the same reference numerals.

  In the embodiment shown in FIG. 6, the structure of the indicator means 22 is different from the embodiment described above. Specifically, in the embodiment described above, the indicator means 22 is configured by the opaque film 23 and the transfer sheet 24. However, in the present embodiment, the indicator means 22 is configured by only the opaque film 23. Yes. In the indicator means 22 of this embodiment, the water-soluble ink 26 dissolved in urine flows out through the opening 25 to the back sheet 12 side. The water-soluble ink 26 that has flowed out forms a circular pattern 28 on the surface of the opaque film 23 that faces the back sheet 12. This pattern 28 can be visually recognized from the outside of the diaper 10 through the back sheet 12. By visually recognizing this pattern 28, the amount of urine absorbed in the diaper 10 can be accurately known, and the replacement time of the diaper 10 can be appropriately determined.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, each of the above embodiments is an example in which the present invention is applied to an unfolded diaper. However, the present invention can be similarly applied to other types of diapers, for example, pants-type diapers.

  In the above-described embodiment, the water-soluble ink 26 is applied around the opening 25. However, as long as the water-soluble ink 26 can flow out to the back sheet 12 through the opening 25, the water-soluble ink 26 is dissolved. The ink 26 does not need to be applied around the opening 25.

  Further, in each of the embodiments described above, the indicator means 22 is arranged in the region from the crotch region C to the ventral region B of the diaper 10. Instead, from the crotch region C to the dorsal region A of the diaper 10. The indicator means 22 may be arranged in the area. Further, the indicator means 22 may be arranged in a region from the back region A to the ventral region B including the crotch region C.

  Further, in each of the embodiments described above, the plurality of apertures 25 are formed in the opaque film 23. However, instead of this, only one aperture 25 may be formed.

Drawing 1 is a perspective view showing the wearing state of one embodiment of the disposable diaper of the present invention. FIG. 2 is a perspective view showing a state in which the diaper shown in FIG. 1 is developed. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an exploded perspective view of the indicator means. FIGS. 5A to 5D are diagrams schematically showing a state of color change of the indicator means due to urination. FIG. 6 is a schematic diagram (FIG. 5C) corresponding to the indicator means used in another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disposable diaper 11 Top sheet 12 Back sheet 13 Absorber 14 Waist flap 15 Leg flap 16 Solid guard forming sheet 17 Leg elastic strand 18 Solid guard 19 Solid guard elastic member 20 Fastening tape 21 Fastening means 22 Indicator means 23 Opaque film 24 Transfer sheet 25 Opening 26 Water-soluble ink 27 Display 28 Pattern

Claims (7)

A top sheet located on the side close to the wearer's skin; a back sheet located on the side far from the wearer's skin; and an absorbent body disposed between the two sheets; the back sheet and the absorbent body; A disposable diaper provided with indicator means to inform urination by a change in color,
A disposable diaper, wherein the indicator means comprises an opaque film having one or more apertures through which liquid can pass, and a water-soluble ink is applied to the absorber-facing surface of the opaque film.   The disposable diaper according to claim 1, wherein the opaque film has a shape extending in a longitudinal direction of the diaper, and a plurality of the openings are formed at substantially equal intervals along the longitudinal direction of the diaper.   The disposable diaper of Claim 1 or 2 in which the said indicator means further contains the hydrophilic fiber sheet distribute | arranged to the back sheet opposing surface side of the said opaque film.   The disposable diaper according to claim 3, wherein the fiber sheet has the same color as the opaque film.   The disposable diaper according to claim 3 or 4, wherein some of the constituent fibers of the fiber sheet are present in the opening.   The disposable diaper according to any one of claims 1 to 5, wherein two or more types of apertures having different shapes are formed.   The water-soluble ink is applied around the plurality of openings, and the colors of the water-soluble ink applied around the openings are different from each other. Disposable diapers.

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