JPS607216B2 - Heating time elapsed indicator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating time course indicator at a constant temperature.

A conventionally known method of determining the elapsed heating time and heating history at a constant temperature is to use a dye that melts, evaporates, or sublimates over time when heated, and determines the change in hue density from dark to light. or pigments that melt and evaporate or sublimate over time when heated, and pigments that do not melt and evaporate at the heating temperature;
Alternatively, a method is known in which a non-vaporizable dye, which melts and evaporates at a significantly slow rate, coexists with the dye and detects the change in hue at the heating temperature. However, all of these methods utilize the fading property of volatile dyes that melt and evaporate or sublimate at a constant temperature, and it is difficult to expect a significant change in hue, and it is difficult to distinguish between them. The object of the present invention has been devised to eliminate these problems.

That is, in the present invention, a pattern is formed on a base material with a first layer consisting of an electron-donating color-forming dye that changes color from colorless or very pale to deep color over time by heating, and then by heating, The present invention relates to a heating time-lapse display characterized by providing a second layer made of a volatile dye that melts and evaporates or sublimates. That is, the present invention relates to changes over time caused by heating of the electron-donating color-forming dye forming the first layer, that is, the pattern, on the base material.

A change from colorless to colored, or a change from light color to dark color, and a change over time due to the heating of the vaporizable pigment forming the second layer, or a change from colored to colorless, or from purulent to light color. It is characterized by the ability to easily obtain countless pigment changes by combining two contradictory changes.
That is, as shown in FIG. 1, by providing a first layer 2 on which a design (leather letters or pattern) is formed on a base material 1, and further providing a second layer 3, the color shown in FIG. As shown in Fig. 3, the electron-donating color-forming dye contained in the first layer 2 gradually develops color, and at the same time, the vaporizable dye contained in the second layer 3 gradually decreases and fades, as shown in Fig. 3 over time. As shown in FIG. A design (letter or pattern) that differs from the initial hue due to the electron-donating color-forming dye in layer 2 being completely colored and the vaporizable dye in second layer 3 being completely or mostly fading at the same time. The feature is that it stands out. In the present invention, the electron-donating color-forming dyes include malachite green lactone, crystal violet lactone, crystal violet carbinol, malachite green carbinol, N-(2,3-dichlorophenyl) leuco Auramine, N-phenyl auramine, rotamine B
lactam, benzoylleucomethylene blue, 2-(phenyliminoethanedylidene)-3,3-dimethylindoline, N-3,3-trimethylindolinobenzospiropyran, 8-methoxyN-3,3-trimethylindolino Benzospiropyran, 3-diethylamino-6-methyl-7-chlorofluoran, 3-diethylamino-6
- Organic compounds such as benzyloxyfluorane and 1,2-benz-6-jethylaminofluorane. Specifically, volatile dyes include disperse dyes, oil-soluble dyes, and These include basic dyes, benzine-soluble dyes, medium dyes, and vat dyes.

The display of the present invention can visually recognize, for example, the doneness of food in a heater, the appropriate heating time for boiled eggs, or the doneness of food in a microwave oven.

In addition, the present invention has many other uses, such as being able to be used as an indicator for heat sterilization, by utilizing the sharpness of the color change and the stepwise change in color. Example m
An ink consisting of the following formulation was created.

・・・・・・■■ Similarly, an ink consisting of the following formulation was prepared. ·river.・■Tsuyoshi Next 70 Yu/On the Power Art Paper■
The first layer was printed with a small bird pattern using silk screen ink.

Furthermore, using the ink (■), it was printed on a silk screen to form a second layer. {130 printed matter obtained in 4'■
I put it in the oven in the afternoon, sampled the progress every 2 hours, and heated it for 10 hours.The print that was yellow before heating continued to turn blue, and the bird pattern became more bluish, and other parts than the pattern turned yellow. However, most of the yellow color disappeared, and in the end, only the small bird design stood out in blue.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the display body of the present invention, and FIGS. 2 to 4 are schematic diagrams sequentially showing changes over time when the embodiment of FIG. 1 is heated. . 1... Base material, 2... First layer, 3...
・Second layer. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A pattern-shaped first layer is formed on the substrate by heating, and the main component is an electron-donating color-forming dye that changes from colorless or pale to dark over time, and then heated to melt and evaporate or A heating time elapsed display characterized by providing a second layer containing a dye that sublimes as a main component.