JP3527368B2 - Disposable diapers - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper having indicator means for notifying a mother or the like that urine has been excreted. 2. Description of the Related Art A disposable diaper disclosed in Japanese Utility Model Laid-Open Publication No. 3-58416 is provided with a discoloration layer formed on the inner surface of a polyethylene back sheet, and a coloring and covering the discoloration layer. Indicator means comprising a symbol formed by the transparent layer. According to this means, the excreted urine penetrates the permeable layer to reach the discolored layer, and the discolored layer is made transparent so that the design of the permeable layer is made visible so that it can be seen from the outside of the diaper. Looks at the design and finds out that the diaper is ready for change. [0003] A feature of the known indicator means is that when urine is excreted, the pattern becomes visible so as to be easily visible. On the other hand, young children develop their self-esteem as they grow up. Could be done. In order to avoid this, the diaper indicator means worn by infants need not be such that infants can easily identify that urine has been excreted, but only if the mother can identify it. There will be. In view of the above, an object of the present invention is to provide a disposable diaper with indicator means capable of providing such a degree of discrimination. In order to solve the above-mentioned problems, the present invention is based on the premise that a liquid-absorbing core is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. The backsheet is made of a light-transmitting plastic film, and is a disposable diaper having an indicator means capable of identifying from the outside of the backsheet that urine has been excreted. [0005] On this premise, the present invention is characterized in that the indicator means is a water-absorbent sheet located between the back sheet and the core, and a back sheet facing surface formed on the water-absorbent sheet. A first colored portion having a color tone different from that of the back sheet, which is always visible from the outside of the back sheet, and a back sheet facing the back sheet and the first colored portion. The first color portion is formed intermittently between the first color portion and the first color portion from the outside of the back sheet from the outside of the back sheet when the wet state is obtained. And a second colored portion that allows visual recognition of
The first and second coloring portions form a required pattern or figure that is visible from the outside of the back sheet, and when the diaper is in a wet state, the second coloring portion has transparency, The pattern or figure substantially disappears. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a disposable diaper according to the present invention will be described below with reference to the accompanying drawings. A disposable diaper 1 shown in a partially cutaway perspective view in FIG. 1 is of a pants type and has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and both sheets 2, 2.
3, a front waist region (front body) 6, a rear waist region (back body) 7, and a crotch region 8 located between these two regions. . The front and back sheets 2 and 3 overlap each other at a portion extending from the peripheral edge of the core 4 and are bonded by a hot melt adhesive (not shown). The front and rear waist regions 6 and 7 overlap each other at the left and right side edges in a palm-shape manner and are welded at a portion 9 which is intermittently arranged in the vertical direction, so that the waist opening 11 and the left and right leg openings 12 are formed. And form. These openings 1
At the peripheral edges of the sheets 1 and 12, a waist elastic member 13 and a leg elastic member 14 are located between the front and back sheets 2 and 3 and are adhered to at least one of the inner surfaces of the sheets 2 and 3 in an extended state. An indicator means 16 is disposed inside the back sheet 3 in the front waist region 6 and / or the front crotch region 8 to enable identification of excretion of urine. When the diaper 1 is in a dry state, the indicator means 16 can visually recognize the color tone of the rectangular first colored portion 21 indicated by oblique lines from the outside of the back sheet 3. The first colored portion 21 has a color tone different from that of the back sheet 3, and it is easy to visually recognize the portion 21. In the first coloring section 21, the first coloring section 2 is provided.
A second colored portion 22 having a color tone different from 1 is formed, and the color tone of the first colored portion 21 is partially hidden.
The color tone of the second colored portion 22 can be visually recognized from the outside of the sheet 3 due to being different from the color tone of the back sheet 3, or can be invisible due to the same color tone as the back sheet 3. When the diaper 1 is in a wet state, the second colored portion 22 becomes transparent,
The entirety of the indicator means 16 is visually recognized as the color of the first colored portion 21. FIG. 2 is a partial sectional view taken along the line II-II of FIG. In the figure, indicator means 16 is located between back sheet 3 and core 4. The back sheet 3 is a plastic film of polyethylene, polypropylene, or the like, has a white or milky white color, and has a light transmittance such that the color of the first colored portion 21 of the indicator means 16 can be easily visually recognized. Even if the back sheet 3 is colorless and transparent, the diaper 1 does not have any functional problems.
The fact that the inside of the camera is clearly visible is not what the user prefers. [0010] The core 4 is obtained by coating ground paper or a mixture 17 of ground pulp and superabsorbent polymer with tissue paper 18. The indicator means 16 is provided for the water absorbing sheet 2
3, a first colored portion 21 formed on the back sheet 3 side of the sheet 23, and formed intermittently on the first colored portion 21;
The second coloring portion 22 partially conceals the first coloring portion 21. The water-absorbent sheet 23 is a hot-melt adhesive (not shown) applied intermittently to its lower surface.
Is in close contact with the tissue paper 18 of the core 4. The first colored portion 21 is a layer of paint or printing ink that exhibits a required color such as red or blue, and has a hydrophilic property. The first colored portion 21 includes, for example, 5 to 20% by weight of a pigment having a color tone capable of distinguishing the portion 21 from its surroundings, 5 to 35% by weight of light-scattering inorganic particles such as silica and alumina, and hydrophilicity. It can be obtained by printing or applying an aqueous ink or paint comprising 5 to 25% by weight of an acrylic binder and 30 to 75% by weight of water and drying. The second colored portion 22 scatters light in a dry state to exhibit a white or milky white color, and makes it difficult or difficult to visually recognize the first colored portion 21 through the portion 22, while the scattered light in a wet state. Is reduced and the first colored portion 21 can be seen through. Examples of a material for forming the second colored portion 22 include 10 to 40% by weight of inorganic particles such as silica and alumina, 5 to 25% by weight of a hydrophilic acrylic binder, and 40% by weight of water.
There is an aqueous ink or paint comprising up to 85% by weight. The second colored portion 22 can be obtained by partially printing or applying these inks or paints on the first colored portion 21 and drying. In the figure, there is a gap corresponding to the thickness of the second colored section 22 between the back sheet 3 and the first colored section 21, but in practice, the thickness of the second colored section 22 is extremely small, Is not equal to In the diaper 1 configured as described above, excreted urine reaches the second colored portion 22 from the core 4 and is
2 is wetted and becomes transparent, until then, the first colored portion 21
The pattern and the graphic formed as shown in the illustrated example by the and the second coloring portion 22 disappear, and the indicator means 16 becomes only the color of the first coloring portion 21. This indicator means 1
Reference numeral 6 indicates that the appearance of the first colored portion 21 is not partially changed by urinary excretion, but acts to change a part of the appearance of the first colored portion 21. Can be easily understood by infants but difficult for infants to understand. There is no strict difference between a pattern and a figure in the present invention, and the pattern in the present invention can be called a figure and vice versa from the viewpoint of a diaper user. It is. FIG. 3 is a drawing similar to FIG. 2 showing an example of an embodiment of the indicator means 16 for embodying the present invention. In this indicator means 16, the water absorbing sheet 2
The first colored portion 21 is formed on the lower surface of the sheet 3, and the second colored portion 22 is formed on the upper surface of the sheet 23. The indicator means 16 is adhered to the tissue paper 18 via a hot melt adhesive (not shown) applied intermittently on the first colored portion 21 or on an exposed portion 27 on the lower surface of the water absorbent sheet 23. In the figure, the exposed portion 27 is shown as being separated from the tissue paper 18, but the first colored portion 2
Since the thickness of 1 is extremely small, the exposed portion 27 is substantially in close contact with the tissue paper 18. The disposable diaper 1 with the indicator means 16 configured in this way works in the same way as that of FIG. FIG. 4 is a drawing similar to FIG. 2 showing an example of an embodiment of the indicator means 16 for embodying the present invention. In the indicator 16, the first colored portion 21 and the second colored portion 22 are stacked on the upper surface of the water-absorbent sheet 23 as shown in FIG.
Hot melt adhesive 31 is applied intermittently. This hot melt adhesive 31 may be colorless and transparent,
Use is made of a material which is transparent in the same color as the colored portion 21 and which can penetrate into the second colored portion 22 by containing an oil component and can be made transparent as in the case where the portion 22 is wet with water. In this indicator means 16, if the diaper 1 is in a dry state,
The first colored portion 21 visible from the outside of the back sheet 3 through the back sheet 3 and the hot melt adhesive 31 and the second colored portion 22 partially covering the portion 21 are provided with required patterns and figures. To form If the diaper 1 is wet, the adhesive 3
2nd colored part 22 exposed between 1 and adhesive 31
Is transparent, so that the first colored portion 21 can be seen therethrough. As a result, almost the entire indicator means 16 looks like the color tone of the first colored portion 21. In the present invention, the indicator means 16
There are no particular restrictions on the size, shape, or location where it should be placed. There is no particular limitation on the pattern or figure formed by the first colored portion 21 and the second colored portion 22 that partially hides the first colored portion 21. A hot-melt adhesive or a pressure-sensitive adhesive can be used for bonding the constituent members of the diaper 1. If the members are heat-meltable, the members may be welded to each other instead of bonding. In the disposable diaper according to the present invention, it is easy to make it difficult for the infant to recognize the change in the pattern of the indicator means for notifying the mother that urine has been excreted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view of a disposable diaper. FIG. 2 is a partial sectional view taken along line II-II of FIG. FIG. 3 is a drawing similar to FIG. 2 showing an example of an indicator means. FIG. 4 is a view similar to FIG. 2, showing another example of the indicator means. [Description of Signs] 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Liquid absorbent core 16 Indicator means 21 First colored section 22 Second colored section 23 Water absorbent sheet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Real opening 1984-58 211 (JP, U) Real opening sho 59-123110 (JP, U) Real opening sho 60-9907 (JP, U) Real opening 1983 121305 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61F 13/00 A61F 5/00

Claims (1)

(57) Claims 1. A liquid-absorbent core is interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, and the backsheet is formed of a light-transmitting plastic film. A disposable diaper having indicator means capable of identifying from the outside of the back sheet that urine has been excreted, wherein the indicator means is a water-absorbent sheet located between the back sheet and the core. A first colored portion formed on the water-absorbent sheet and having a back sheet facing surface and a core facing surface, and which is always visible from the outside of the back sheet and has a color tone different from that of the back sheet; during between the backsheet and the backsheet facing surface of the first colored portion
It is formed intermittently, partially obscures the color tone of the first colored portion in a dry state, and takes on transparency when it becomes a wet state so that the color tone of the first colored portion can be visually recognized from outside the back sheet. The first and second coloring portions form a required pattern or figure visible from the outside of the back sheet, and when the diaper is in a wet state, The said diaper, wherein the two colored portions are transparent and the pattern or figure substantially disappears.