JP3045651B2 - Period indicator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like period containing a normal-temperature volatile liquid, which makes it possible to display the display at the beginning or end of the period differently from the display at the end of the period. The present invention relates to a novel configuration of a display.

[0002]

2. Description of the Related Art Heretofore, a period indicator of a type in which a certain display appears on a surface in accordance with the remaining amount of a contained liquid has been already developed. For example, a period indicator disclosed in Japanese Utility Model Publication No. 5-938, Japanese Patent Publication No. 63-24961, and the like.

[0003] Specifically, the former is a period indicator 45 shown in Figure 21, the liquid permeable nonwoven fabric or the like board member 46
The display substrate having a liquid-permeable display layer 47 having a low refractive index with respect to light on the surface thereof contains the liquid 5 which is volatile at normal temperature. Reference numeral 48 denotes a support plate.

In the period indicator 45, the liquid 5 penetrates into the display layer 47 and becomes transparent, so that the entire surface of the substrate material 46 is exposed from the beginning to the effective period. At the end of the period in which the liquid 5 disappears, the display function is displayed by making the display layer 47 opaque.

[0005] The latter is a period indicator 50 shown in FIG. 22 , in which a display layer 52 made of a liquid-impermeable material and a display layer 52 made of a liquid-impermeable material are provided on the surface of a liquid-permeable substrate material 51 such as a nonwoven fabric.
The liquid 5 is contained in the display substrate on which the concealing layer 53 applied so as to cover the liquid crystal 2 is formed. In addition, 54 is a support plate.

In the period indicator 50, the liquid 5 penetrates into the concealing layer 53 and is made transparent, so that the display layer 52 and the surface portion of the substrate material 51 are exposed during the initial or effective period. At the end of the period in which the liquid 5 has disappeared from the layer 53, the color of the concealing layer 53 is exposed due to the opacity of the concealing layer 53, so that the display layer 5 is exposed.
As a result, the display function is exhibited.

[0007]

As described above, the display function of the conventional period display, except for the change in coloring on the surface of the display, is either at the end of use or at the beginning of use or during the effective period. , It merely functions so that a predetermined symbol display appears. For this reason, it was not possible to function so as to display an appropriate symbol for the initial use and the end of use including during the valid period.

In particular, in the period indicator 50, the display layer 5
Since 3 is formed of a liquid impermeable material, during use, as shown in FIG. 23 and FIG. 24 , a bias of the contained liquid 5 occurs around the display layer 52, and as a result, the display becomes uneven. is there.

That is, in the vicinity of the display layer 52, there is a disadvantage that the liquid 5 existing in the concealing layer 53, which is an upper layer, volatilizes and disappears at an early stage of use. In other words, the liquid 5 stays in the lower portion of the substrate material 51. For this reason,
This is because a transparent portion 53a and an opaque portion 53b are generated in the concealing layer 53 according to the difference in the supply amount of the liquid 5 from the periphery of the display layer 52.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet-shaped period indicator having a structure capable of displaying different symbols clearly and uniformly at both an initial stage and a final stage of use.

[0011]

In order to achieve the above-mentioned object, in the present invention, a period indicator is constituted as follows. In other words, the first display layer of the display symbol type, which has a constant display symbol shape on the sheet-like substrate material surface exhibiting liquid permeability and which exhibits a liquid-permeability and a higher reflectivity to light than the substrate material surface when a liquid is contained, and the liquid permeability Display substrate having a second display layer having a display symbol having a constant display symbol shape and exhibiting a low refractive index to light when containing a liquid, characterized in that the display substrate contains a normal-temperature volatile liquid. And

In the present invention, the board material is paperboard,
Paper including synthetic fiber mixed paper, non-woven fabric, felt-like woven fabric,
Inorganic fibers or the like that have a liquid holding ability and that can chemically transfer the remaining liquid sequentially according to the volatilization state of the liquid can be used.

[0013] The first display layer has a relatively high refractive index and a high reflectance with respect to light when it contains a liquid. The first display layer has sericite, talc, kaolin, aluminum silicate, calcined clay, calcium carbonate, titanium dioxide ( (Anatase type or rutile type) or the like, and a binder may be mixed with a powder colorant such as an anatase type or a rutile type, and a coloring agent such as a dye or a pigment may be added to enhance the discriminability of display. As the binder, vinyl acetate, EVA, NBR, S
BN, acrylic or other latex can be used.

In the second display layer, a binder is mixed with a white pigment such as amorphous silica, kaolin, calcium carbonate, etc., which exhibits a low refractive index to light when a liquid is contained, a fine powder called plastic pigment, and the like. It can depend on the forming material. A colorant similar to that of the first display layer can be added, provided that the color is similar to the color of the surface of the substrate material or a color that cannot be visually identified so as not to be displayed when the liquid is contained. In addition, as the binder, in addition to those described above, a synthetic resin material such as acrylic resin and polypropylene, and a water-soluble polymer such as CMC can be used.

Regarding the colorants used in the first display layer and the second display layer, when the liquid is contained, the light reflectance of the first display layer is determined with respect to the irradiation of light passing through a green filter against the substrate material surface. The combination of the hunter reflectance, which is the reflectance, is at least 2.5% or more, preferably 7.0% or more, as long as the second display layer is 2.5% or less with respect to the substrate material surface. Not done. Since the reflectivity differs depending on the type of the contained liquid, the combination of the two changes accordingly. In addition, since the reflectance increases as the thickness of the display layer increases, the combination of the first display layer and the second display layer is determined by increasing the difference in reflectance between the two by making the first display layer thicker than the second display layer. Can be.

The first and second display layers may include, for example,
It is conceivable that the first display layer is formed of the same type of material as calcium carbonate, but in this case, the first display layer is formed of a different crystalline aragonite type having a difference in the reflectance of calcium carbonate with respect to light, The second display layer may be formed of a mold type, and the thickness of each layer may be appropriately adjusted as described later, so that the characteristics of each display layer can be exhibited.

The amount of the binder in each of the display layers is not completely determined by the type of the colorant used, the type of the binder, and the method of forming each display layer, but the amount is sufficient to sufficiently fix the colorant. It is required that the amount is not less than the above and is not more than the amount at which effective liquid permeability is obtained. In the case of the coating method, it is generally preferable that the binder is 10 to 30 parts by weight based on 100 parts by weight of the coloring agent,
In the case of the printing method, particularly when the display layer is formed by screen printing, the amount is preferably about 50 parts by weight of the binder with respect to 100 parts by weight of the coloring agent. As a viscosity modifier.

Regarding the color, especially when the above-mentioned display layers are formed in layers, the first display layer clearly indicates the sign when the liquid is contained, and the second sign when the liquid disappears. It is a color that can be sufficiently concealed by the display layer, and a color that cannot be identified when the liquid is contained in the second display layer, that is, a color that can sufficiently conceal the first display layer when the liquid disappears, and that the substrate material surface Preferably, the color is much lighter than the color. In addition, when the overlapping portion of each display layer contains a liquid, the first display layer is transparent, but the color of the display symbol by the first display layer is a mixed color according to the coloring of each display layer. It can be configured as an object of various colors. In addition, it is preferable that each display layer has a white color or a color close thereto, from the viewpoint of easy manufacture.

The coating thickness of each display layer is required to be a thickness suitable for exerting the above-mentioned functions, and varies depending on the type and the amount of the coloring agent used.
For example, when kaolin is a forming material used as a coloring agent for the second display layer, the coating thickness can be 4 to 100 g / m ² (dry). The coating thickness of the first display layer can be set appropriately within the above range so as to maintain the opaque state when the liquid is contained.

Further, each display layer is formed such that its planar shape forms a certain display symbol shape. Each of the display symbol shapes may have a completely different shape, or each of the display layers may have an overlapping portion or exhibit a certain display symbol shape in a combined state. It is to be noted that the certain display symbol shape of each display layer is limited in the case where the entire surface of the first display layer is covered with the second display layer.

The display layers may be formed by a method of applying them in order, but may be a mechanical printing method such as silk screen printing, offset printing, or gravure printing. Further, the display substrate with each display layer described above, a synthetic resin material such as polypropylene on the other side of the substrate material,
A plate-like or film-like cover material made of a liquid-impermeable material such as a glass material may be laminated, and further, an adhesive or pressure-sensitive adhesive layer may be formed on the cover material surface.

Also, a display substrate in which the above-mentioned display layers are formed on both planes of the substrate material, and a display substrate in which the above-mentioned display materials are formed on both surfaces of the above cover material on one side thereof are laminated. It can also be.

A relatively dark colored layer formed by adding a colorant to the same forming material as the first display layer described above may be formed on the surface of the substrate material. In this case, each of the display layers described above is formed on the surface of the substrate material via the colored layer.

The shape and size of the display substrate as described above can be arbitrarily determined according to the purpose of use as the period display, and are not particularly limited.
It can be a short flat surface having a thickness of 28 mm × 150 μm.

[0025] The liquid to be contained in the display substrate is permeable to the display substrate and is chemically inactive at room temperature for a short period of time to be displayed. It can be appropriately selected depending on the situation.
For example, for short-term display, water, alcohol such as ethanol, isoamyl acetate, etc., and for long-term display, fragrance such as glycerin, glycol such as propylene glycol, triethylene glycol, linalool, geraniol, and one month. For long-term display over the above, lauryl alcohol, diethyl phthalate, benzyl benzoate, isopropyl myristate, silicon oil, and the like, and a mixture thereof, for example, an aqueous solution can be used.

The liquid may be a liquid agent which is volatile at normal temperature and which itself or its vapor effectively exerts a certain function, for example, an insecticidal action and an insect repellent action. For example, 0- (2,2-dichlorovinyl) -0,0-dimethylphosphate, 4-methyl-4
-Hepten-1-yn-3-yl d-cis, transchrysanthemate, 2,3,4,5,6-pentafluorobenzyl, 2,2-dimethyl-3- (2,2-dichloroethenyl)- Oily liquid agents such as cyclopropane-1-carboxylate can be mentioned.

In addition, other functional components such as a volatilizing agent which can be mixed almost uniformly can be appropriately added to the liquid in an amount which does not affect the display function of the liquid. Examples of the volatilization modifier include liquid paraffin, jojoba oil, silicone oil, castor oil, pine oil, mint oil, and the like, and these can be preferably incorporated in an amount of 20% by weight or less.

The liquid to be contained can be contained in the display substrate by a known method such as an immersion method, an injection method, or a drop impregnation method.

Further, the content of the liquid differs depending on the type of the liquid and the display period and cannot be determined unconditionally. This amount is adjusted depending on the type, size, thickness and the like of the substrate material. In addition, a sufficient amount is contained and held in the content form over the entire display substrate according to the function display. For example, when the substrate material is a paper-like material having a thickness of 10 mm × 30 mm × 0.1 mm,
If the liquid is oily dimethyl phosphate,
A content of 40 mg to 60 mg is a preferred amount.

[0030]

In the present invention, the following effects are produced. First, when the liquid is sufficiently contained in the display substrate, initially, the contained liquid is mainly retained in the substrate material, but part of the liquid permeates the first display layer and the second display layer. At this time, the first display layer exhibits a higher reflectivity to the light than the substrate material surface, so that the opaque state is maintained. However, the second display layer is transparent or has a low refractive index for the light. Coloration and color tone are assimilated. As a result, only the symbol display based on the first display layer appears on the display surface.

Next, during the effective period, the liquid gradually volatilizes and disappears from the display surface or the like. However, since each display layer is formed in a higher density state than the substrate material, the liquid is physically removed from the liquid in the substrate material. As a result, a suction action occurs and the liquid stays for a relatively long time. For this reason, even at a point near the end of the display period, the transparency or assimilation state of the second display layer is continued, and the display of the valid period by the first display layer is maintained.

When the amount of liquid present in the second display layer tends to decrease, the second display layer gradually becomes opaque and almost completely disappears, and becomes opaque. This opacity renders the first display layer in a concealed state, so that the display symbol of the second display layer appears on the display surface. In this case, if this symbol display is configured to include a portion of the first display layer excluding a portion overlapping with the second display layer, a display symbol including the portion of the first display layer is used. Appear.

When such a function is provided by the display substrate provided with the cover material on one surface, the effect is generated in a direction deviated to the display surface on the other surface, and also by the display substrate provided with the display surfaces on both surfaces. If so, it occurs on both display surfaces.

[0034]

Next, embodiments of the present invention will be described. First, the period indicator A in the embodiment is shown in FIGS. The period indicator A comprises a display substrate 1 and a normal-temperature volatile liquid 5 contained therein.

The display substrate 1 has a first display layer 3 having a predetermined symbol shape laminated on one surface of a liquid-permeable substrate material 2,
Further, a second display layer 4 having a predetermined symbol shape is laminated on the first display layer 3 so as to completely cover the first display layer 3 to form a display surface.

Each of the display layers 3 and 4 is a material exhibiting a liquid permeability, and the second display layer 4 has a low refractive index for obtaining a transparent state when a liquid is contained. The first display layer 3 is formed so as to have a difference in reflectance with respect to light from the surface of the substrate material 2 such that the symbol form on the surface of the substrate material 2 can be identified.

On the other side of the substrate 2, a liquid-impermeable support plate 6 and an adhesive 7 are sequentially laminated.

The liquid 5 is impregnated into the substrate material 2 with respect to such a display substrate 1. When the liquid 5 is contained, the liquid 5 also penetrates into the display layers 3 and 4. Therefore, as a result of the second display layer 4 being made transparent, the first display layer 3 appears on its display surface. This state is shown in FIG. 2 by clearly showing the reflection surface of the incident light 8.

In the period indicator A configured as described above, during use, the contained liquid 5 volatilizes sequentially to the outside via the display surface in accordance with its normal temperature volatility. Accordingly, the content of the liquid 5 gradually decreases in the substrate material 2, but as shown in FIGS. 3 and 4, the liquid 5 enters the display layers 3 and 4 in a higher density state than the substrate material 2. residual containing liquid 5 tends to be adsorbed moved.

Therefore, even at the end of the display period, the presence of the liquid 5 in each of the display layers 3 and 4 based on the above-described high density tends to cause the presence of the base in each of the display layers 3 and 4. A larger amount of the liquid 5 will remain than the plate member 2. As a result, the transparent state of the second display layer 4 is maintained until the end of the display period, and the display of the effective period is maintained until immediately before the end. In addition, 5a shows the volatile gas of the contained liquid 5.

FIGS. 5 and 6 show the state at the end of the display period on the period display A. FIG. At this point, most of the contained liquid 5 including the display layers 3 and 4 disappears from the display substrate. At this time, in particular, as a result of the second display layer 4 becoming opaque and concealing the first display layer 3, the symbol display of the second display layer 4 appears on its display surface.

The period indicator B shown in FIGS. 7 and 8 is a case where the planar shapes of the lower first display layer 12 and the upper second display layer 13 are formed as character symbols. Reference numeral 10 denotes such a display layer 1 on the surface of the substrate material 11.
2 is a display substrate including 2 and 13. FIG. 9 shows a display state on the display surface at the end of the display period, in which the second display layer 13 is made opaque and its display symbol appears.

Next, FIG. 10 and FIG. 11 show the period indicator C in the embodiment. The period display C includes a display substrate 14, and the display substrate 14 has a first display layer 16 and a second display layer in a form having a partially overlapped portion 18 on one surface of a substrate material 15 as shown in the drawing. 17 are sequentially laminated.

Further, the above-mentioned substrate material 15, first display layer 1
6 and the second display layer 17 are respectively the substrate material 2 described above,
It has properties corresponding to the first display layer 3 and the second display layer 4.
Therefore, when the liquid 5 is impregnated in the substrate material 15, the second display layer 17 is made transparent as described above. As a result, the symbol display by the first display layer 16 appears on the display surface.

At the end of the display period, FIG.
As shown in FIG. 13, the second display layer 17 is made opaque in the same manner as described above, and the second display layer 17 appears on the display surface. At this time, only the overlapping portion 18 of the first display layer 16 is concealed. Therefore, the display symbol appears as a display symbol 19 in which the portion of the second display layer 17 is added to the portion of the first display layer 16.

Next, the period indicator D in the embodiment shown in FIG. 14 and FIG. In the display substrate 20, the first display layer 22 and the second display layer 23 are formed on the surface of the substrate material 21 in the same plane, and the display symbols are related to the combination.

[0047] In this period display D, initially the liquid 5 containing permeates into the display layers 22 and 23, to which only the second display layer 23 is transparent. Therefore, only the first display layer 22 appears on the display surface. Next, when the second display layer 23 becomes opaque at the end of the display period, as shown in FIG. 16, a combination symbol 24 of each of the display layers 22 and 23 appears on the display surface. In this way, it can be configured as various display symbols.

Next, the period display E in the embodiment shown in FIG. 17 is similar to the period display A in that the first display layer 3 and the second display layer 4 are the same as those on the display surface. The display substrate 25 is formed on a flat surface. Accordingly, when the liquid 5 is contained in the display substrate 25, the same function as the display surface of the period display A is exerted on both surfaces of the display substrate 25.

The period indicator F in the embodiment shown in FIG. 18 is a display substrate 26 in which the first display layer 3 and the second display layer 4 are laminated on the surface of the substrate material 2 via the colored layer 27. By. The coloring layer 27 is formed of a material that is liquid-permeable and has a reflectance that is opaque to light even when a liquid is contained.

Therefore, when the liquid 5 is contained in the display panel 26, the coloring based on the coloring layer 27 is clearly displayed on the display surface over the entire period from the beginning to the end of the period display. . As a result, the display symbols clearly appear according to the color difference between the display layers 3 and 4. The coloring layer 27 also acts to adjust the amount of volatilization of the contained liquid 5.

Next, an application example of the period indicator according to the present invention will be described. First, FIG. 19 shows an application example of the period indicator A, which is fixed on the surface of a case 30 accommodating a granular deodorant 33 with an adhesive 7. Reference numeral 31 denotes an opening on the case 30, and reference numeral 32 denotes a hook.

In this application example, the period display A displays the period display with a predetermined display symbol in accordance with the end point of the function of the deodorant 33. Such an application is also the same for the period indicators B to D and F.

FIG. 20 shows an application example of the period indicator E. In this application example, the period indicator E is supported on the support frame 35 via a fitting portion 37 formed inside the support frame 35, and the display surfaces on both sides of the indicator E are provided through the opening of the support frame 35. It is exposed. Reference numeral 36 denotes a hook portion of the support frame 35.

According to this application example, it can be used for displaying a period in any case, and the display is confirmed from multiple directions.

(Test Example 1) In this test, 25 g of a paper material (20 mm × 20 mm × 800 μm) having a red coloration surface was formed using a forming material composed of various coloring agents listed in Table 1 below. / m ² with a symbol display layer formed by a screen printing method with a coating thickness of various liquids 6
The results are shown by confirming the display state before and after containing 0 mg. In addition, an acrylic latex was used as a binder at a ratio of 1: 0.5 to the colorant.
It was blended in parts by weight.

[Table 1]

In Table 1, when it can be clearly understood,
When it is slightly thin but readable, it is indicated by 示 し, and when it is hardly readable, it is indicated by x. However, the difference in reflectance from the red paper material surface when clearly readable is 7.0 or more, and the difference in reflectance when it is hardly readable. Was 2.5 or less, and it was a little thin, but when it was legible, it was an intermediate value.

From the results shown in Table 1, it is clear that the indication of the liquid impregnating agent can be clearly read in any case, but the indication state differs depending on the type of the liquid contained when the liquid is contained. In particular, when the contained liquid is dimethyl phthalate, the transparency is higher in the order of silica, kaolin, hollow polymer and calcium carbonate (calcite type), and when the contained liquid is polyethylene glycol, silica, kaolin And calcium carbonate (calcite type) in order of transparency. Therefore, it is understood that these are suitable for the colorant of the second display layer, and that the other colorants are suitable for the colorant of the first display layer in each case.

In the case where silica and titanium dioxide are used, the hunter reflectance when 60 mg of dimethyl phthalate is used is about 65% on the surface of the titanium dioxide layer. 0.011% and 15.02% on the silica layer surface. This is because the difference from the reflectivity of 14.39% on the surface of the substrate material was 7.0 at the layer surface of titanium dioxide.
% And 2.5% or less on the surface of the silica layer, the period indicator of the present invention can be constituted by a combination using titanium dioxide for the first display layer and silica for the second display layer. it can.

As described above, the hunter reflectance on the talc layer surface was 17.67%. This is because the difference from the reflectance of 14.39% on the surface of the substrate material is 3.0% or more. Therefore, the present invention can also be achieved by a combination using talc for the first display layer and silica for the second display layer. A period indicator can be configured.

Test Example 2 The same test as above was carried out by using a mixture of white pigment calcium carbonate (calcite type) and red iron oxide as a colorant as a colorant for the first display layer, and further using silica for the second display. The results are shown in Table 2 below for the case of using a multilayer structure by using the layer as a coloring agent.

[Table 2]

In this test, the first display layer has a similar color to the surface of the substrate material, and is used to confirm the discernable limit of the display. When the amount is less than 3 parts by weight, it is suitable as a material for forming the first display layer because the display is maintained even when the liquid is contained. It can be seen that it can be used as a material for forming the second display layer because the color tone is assimilated. When silica and kaolin were also tested in the same manner as described above, it was difficult to identify the label when the liquid was contained, even if the amount of mixed bengara was 1 part by weight. As a result, it was found that a mixed colorant of silica and kaolin and red iron oxide was suitable as a material for forming the second display layer.

(Structural Example 1) The above-mentioned period indicator A was prepared according to the following specifications. Substrate material; paper material (10 mm × 28 mm × 800 μm); color on the surface of the paper material: blue First display layer; coloring agent: titanium dioxide, binder: acrylic latex, and their blending (weight) ratio: 1: 0.
5. Coating by screen printing method: 25 g / m ² Second display layer; Colorant: silica, binder: acrylic latex, blending (weight) ratio thereof: 1: 0.5, coating film by screen printing method: 25 g / m ² support plate; polypropylene sheet (10 mm x 28 mm
× 100 μm) Liquid; dimethyl phthalate, containing 60 mg by immersion method.

The period indicator A according to this specification is set to room temperature (about 2
(0 ° C.). As a result, the symbol display of the first display layer 3 clearly appeared on the display surface in a white color for 25 days from the start of use. The light reflectance on this layer surface is 5
8.45% (Hunter reflectance, the same applies hereinafter). In addition, only the display symbols of the second display layer 4 clearly appeared on the display surface in a white color through a change in the display state for about one day after the elapse of the above-mentioned 25 days.

(Structural Example 2) Period indicator C according to the following specifications
It was created. Substrate material: paper material (10 mm × 28 mm × 800 μm), color of the surface of this paper material: brown color First display layer; coloring agent: calcium carbonate (aragonite type) binder: polyvinyl alcohol, and their blending (weight) ratio 1: 0.5, coating film by screen printing method: 20 g / m ² Second display layer; coloring agent: silica, binder: acrylic latex, their blending (weight) ratio: 1: 0.5, screen printing method 20 g / m ² support plate; polypropylene sheet (10 mm x 28 mm)
× 100 μm) Liquid; dimethyl phthalate, containing 60 mg by immersion method.

The period indicator C according to this specification is set to room temperature (about 2
(0 ° C.). As a result, the symbol display of the first display layer 16 clearly appeared on the display surface in a white color for 25 days from the start of use. The light reflectance on this layer surface was 21.89%. In addition, the display state changes for about one day after the elapse of the period of 25 days, and the overlapping portion 1
The display symbol 19 relating to the combination of the first display layer 16 portion including 8 and the second display layer 17 clearly appeared on the display surface in a white color.

(Structural Example 3) The period indicator D according to the following specifications
It was created. Substrate material; paper material (10 mm × 28 mm × 200 μm); color on the surface of this paper material: purple color First display layer; coloring agent: calcined clay, binder: polyvinyl alcohol; 0.
5. Coating by screen printing method: 25 g / m ² Second display layer; Colorant: silica, binder: acrylic latex, blending (weight) ratio thereof: 1: 0.5, coating film by screen printing method: 25 g / m ² support plate; polypropylene sheet (10 mm x 28 mm
× 100 μm) Liquid; dimethyl phthalate, containing 60 mg by immersion method.

The period indicator D according to this specification is set at room temperature (about 2
(0 ° C.). As a result, the symbol display of the first display layer 22 clearly appeared on the display surface in a white color for 25 days from the start of use. The light reflectance on this layer surface was 17.99%. Further, after a change in the display state for about one day after the elapse of the period of 25 days, the display symbol 24 associated with the combination of the display symbol of the first display layer 22 and the second display layer 23 has a white color. It appeared clearly on the display surface in color.

(Structural Example 4) The above-mentioned period indicator B was prepared according to the following specifications. Substrate material; paper material (10 mm × 28 mm × 300 μm); color on the surface of the paper material: reddish first display layer; coloring agent: a mixture of calcium carbonate and red iron oxide in a weight ratio of 99: 1, binder: acrylic Latex, their composition (weight) ratio: 1: 0.5, coating film by screen printing method: 20 g / m ² Second display layer; colorant: silica, binder: acrylic latex, their composition (weight) ratio: 1: 0.5, coating film by screen printing method: 40 g / m ² support plate; polypropylene sheet (10 mm × 28 mm
× 100 μm) Liquid; dimethyl phthalate, containing 60 mg by immersion method.

The period indicator B according to this specification is set at room temperature (about 2
(0 ° C.). As a result, over 25 days from the start of use, the symbol display of the first display layer 12 appeared clearly on the display surface in a light reddish color. The light reflectance on this layer surface was 20.51%. Further, only the display symbols of the second display layer 13 clearly appeared on the display surface in a white color through a change in the display state for about one day after the elapse of the above-mentioned 25 days.

Next, on a paper material (10 mm × 28 mm × 200 μm) having a red color surface, argonite-type calcium carbonate or calcite-type calcium carbonate was used as a coloring agent, and acrylic latex as a binder was added in a weight ratio. Were prepared by mixing them at a ratio of 1: 0.5, respectively, and these were applied at coating thicknesses shown in Table 3 below to obtain samples.

[Table 3]

Table 3 shows the reflectance of these samples when light was not impregnated and when the liquid was impregnated with 60 mg of dimethyl phthalate as a liquid. Sex was determined and shown. The criterion for this determination was the same as in Table 1.

From the results shown in Table 3, it can be seen that the same coloring agent can be used for the first and second display layers by using calcium carbonate having a different crystal form for the coloring agent. That is, the aragonite type has a coating thickness of 13
g / m suitable in ² or more of the colorant in the first display layer, also those of calcite type are suitable as colorants in the second display layer in the coating thickness of 32 g / m ² or less. When the coating thickness is 37 g / m ² or more, it can be seen that any crystal type is used as a coloring agent for the first display layer.

(Structural Example 5) The above-mentioned period indicator B was prepared according to the following specifications. Substrate material: paper material (20 mm × 20 mm × 800 μm), color on the surface of this paper material: red First display layer; colorant: calcium carbonate (aragonite type), binder: acrylic latex, and their blending (weight) ratio 1: 0.5, Coating by screen printing method: 13 g / m ² Second display layer; Coloring agent: Calcium carbonate (calcite type), Binder: Acrylic latex, their blending (weight) ratio: 1: 0. 5, coating ... 22 g / m ² support plate by the screen printing method; polypropylene sheet (10 mm × 28mm
× 100 μm) Liquid; dimethyl phthalate, containing 180 mg by a dipping method.

The period indicator B according to this specification is set to room temperature (about 2
(0 ° C.). As a result, the symbol display of the first display layer 12 appeared on the display surface for 75 days from the start of use. The light reflectance on this layer surface was 20.93%. Further, only the display symbols of the second display layer 13 clearly appeared on the display surface in white color through a change in the display state for about one day after the elapse of the above-mentioned 75 days.

Since the present invention is configured as described above, the following effects are exhibited. According to the present invention,
Since the use start time and the end time are clearly indicated by the respective symbols, it is easier to determine whether or not the period has elapsed, unlike a mere change in coloring.

Further, as in the period indicator C described above,
Various display symbols can also be configured, for example, when each display layer on the display substrate is configured to have an overlapping portion.

In the case where a colored layer is provided on the surface of the substrate material as in the above-mentioned period indicator F, display states of various colors can be obtained.

Further, since the display function can be exhibited on both sides as in the above-described period display E,
The display function can be improved.

Further, according to the type of the liquid to be contained, the liquid can be constituted in an odorless state and for an arbitrary display period. However, when the liquid exhibits insect repellent and insecticidal effects, the period display and the actions are used together. It can also be done.

[Brief description of the drawings]

FIG. 1 is a plan view of a period indicator according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same part.

FIG. 3 is an explanatory plan view of the same.

FIG. 4 is an explanatory partial longitudinal sectional view of the same.

FIG. 5 is an explanatory plan view of the same.

FIG. 6 is an explanatory partial longitudinal sectional view of the same.

FIG. 7 is a plan view of the same.

FIG. 8 is a longitudinal sectional view of the roller.

FIG. 9 is a plan view of the same.

FIG. 10 is a plan view of the same.

FIG. 11 is a partial vertical sectional view of the same.

FIG. 12 is an explanatory plan view of the same.

FIG. 13 is an explanatory partial vertical sectional view of the same.

FIG. 14 is a plan view of the same.

FIG. 15 is a partial vertical sectional view of the same.

FIG. 16 is a plan view of the same.

FIG. 17 is a partial vertical sectional view of the same.

FIG. 18 is a partial vertical sectional view of the same.

FIG. 19 is a partially cutaway perspective view of the application example.

FIG. 20 is a partially cutaway perspective view of the application example.

FIG. 21 is a partial longitudinal sectional view of a conventional example.

FIG. 22 is a partial vertical sectional view of the same.

FIG. 23 is a partial longitudinal sectional view of the same.

FIG. 24 is an explanatory partial plan view of the same.

[Explanation of symbols]

A to F: period indicator, 1, 10, 14, 20, 25, 2
6 display substrate, 2, 11, 15, 21 ... substrate material, 3, 1
2, 16, 22 ... first display layer, 4, 13, 17, 23 ...
Second display layer, 5 liquid, 18 overlapping part, 27 coloring layer

Continuation of the front page (56) References JP-A-57-158682 (JP, A) JP-A-61-152601 (JP, A) JP-A-62-145276 (JP, A) JP-A-5-14983 (JP) , U) Jpn. 4-35778 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09F 3/00-3/20 G04F 1/02

Claims (8)

(57) [Claims] 1. A first display layer of a display symbol type having a constant flat shape on a sheet-like substrate material surface exhibiting liquid permeability and exhibiting a higher reflectivity to light than a substrate material surface when light is contained. And a second display layer having a display symbol having a constant display symbol shape and exhibiting a low refractive index with respect to light when the liquid is contained and having a liquid permeability. The display substrate contains a liquid which is volatile at room temperature. A period indicator, characterized in that: 2. The period indicator according to claim 1, wherein the plane shape of the combination of the first display layer and the second display layer has a fixed display symbol shape. 3. The period indicator according to claim 1, wherein said second display layer is overlaid with said first display layer as a lower layer and covering the entire surface. 4. A period indicator according to claim 1, wherein said second display layer is overlaid with said first display layer being a lower layer and covering a part thereof. 5. The period indicator according to claim 1, wherein said first display layer and said second display layer are provided on both front and back surfaces of said substrate material. 6. A colored layer that is liquid-permeable and presents a high reflectance to light when a liquid is contained, at a position on the surface of the substrate material and below the first display layer and the second display layer. The period indicator according to claim 1, 2, 3, 4, or 5, wherein the period indicator is formed. 7. The period indicator according to claim 1, wherein the liquid is an insect repellent or an insecticide. 8. The period indicator according to claim 1, wherein said liquid is a fragrance.