JPS60124681A - Time indicator - Google Patents

Abstract

PURPOSE:To obtain a time indicator which facilitates confirmation of a preservation period or available period and elapsed time at a look from afar, by incorporating both a redox indicator and an air-oxidizable material in a liquid. CONSTITUTION:Both a redox indicator and an air-oxidizable material are incorporated in a liquid. The resulting time indicator is put in a container such as a tube and sealed. At the time of use, part of the container is broken to expose the liquid to air. The liquid keeping a redox reaction may be any of water and an org. solvent, and water or org. solvents for the redox indicator or the easily air-oxidizable material can be used as such. Examples of the redox indicators are resazurin, indigo sulfonic acid, etc. It is preferred to add small quantities of sodium azide, phenylmercury, etc. as germicide and mildewproofing agent for the time indicator itself.

Description

[Detailed Description of the Invention] Conventionally, the shelf life or expiration date of foods and medicines has generally been indicated in letters on their containers, but it has been impossible or difficult to read from a distance. This brings about the inconvenience of having to check it up close or by hand. or,
How long has it been since the beginning of its preservation?
It is tedious to know by calculation from the displayed period.

The present invention provides a time indicator whose storage or expiration period, elapsed period, etc. can be easily checked at a glance from a distance. It consists of The time indicator according to the present invention is prepared in a liquid state or in a semi-solid or solid state by adhering it to a suitable carrier. Generally, it is stored in a rigid or flexible container such as transparent or translucent glass, plastic sheet, film, gold silk foil, etc. to maintain its moist state, and during its storage, the liquid evaporates to function as an indicator. Generally, it is made into a product without losing its deterioration or inoperability.

When using it, it is common to open and open the sealed container. As a sealed container, it does not allow moisture to pass through, but oxygen '150mg/day@cJ 5000m/daycr
When wrapped or covered with a membrane that allows a minute amount of water to pass through, the time indicator does not need to be opened, but it must be ready for use immediately and work well for a long period of time. Can be done.

More specifically, the time indicator of the present invention is a liquid that is sealed in a container such as a transparent or translucent bottle or tube, and when used, a part of the container is broken and the liquid is exposed to air. Use tV1-i'-ru. In order to use the time indicator of the present invention as a semi-solid or solid body, the liquid time indicator may be mixed with a synthetic resin, a gelling substance,
It can be obtained by supporting on inorganic powder particles such as glass powder, paper, porous substrates made of synthetic resin, etc.

Moreover, it can also be manufactured in the form of a coating film by applying it to a product container or the like. The liquid that maintains the redox reaction may be water or an organic solution, and a redox indicator or a water or organic solution of a substance that is easily oxidized by air can be used as is. It is desirable to add a small amount of sodium azide, merthiolate, phenylmercury, hibitin, etc. to the time indicator itself to prevent bacteria and mildew.

As the gelling substance, for example, agar gel, gelatin gel, carrageena, polyacrylamide gel, etc. are used. As redox indicators, □resazolin, sacranin T1 indizasulfonic acid, methine blue, 2.4-diaminodiphenylamine, diphenylamine, diphenylbenzine, diphenylamine-4-nerfonic acid, erioclaucine A, eriogreen B1 xylene blue AB, P-nitrodiphenylamine, xylene blue v
All commonly used so-called redox indicators that change color due to changes in redox potential, such as S, can be used, and a desired color can be selected and used by combining them or by mixing two or more of them. The amount used is o, ooi ~ 1 for the base material.
Generally, the range is 0% (weight), and the appropriate amount is 0.01 to 1% (ili amount).

The color change period, color selection, etc. of the indicator of the present invention are as follows:
Various products can be obtained depending on the type of indicator, the type of air-oxidized substance, the selection or basis of the combination of these, the blending ratio of these, etc.

Therefore, it is common to use those whose storage period corresponds to a predetermined storage period or expiry period of foods, medicines, etc. whose storage periods should be monitored.

The method of using the time indicator of the present invention is, for example, in the case of manufacturing packaged foods or bottled medicines, in the case of the jI+! !
After manufacturing, it is common and convenient to use it as a single body by applying or pasting it on the outside of the sealed bag or bottle, or the outside of the container used to package or transport the product (1). During preparation, the time indicator can be attached to the product and placed near it.The drawing shows an example of its use. On the outside of the bag (1), a solid time indicator (3) is affixed to the outside of the bag (1) at the time of manufacture. The time indicator (3) was sealed in advance with metal foil, etc., and then removed from a commercial product and pasted. (4) is the time indicator (3).
In order to prevent moisture evaporation, the protective membrane is made of a film that is impermeable to moisture but has a slight air permeability. Instead of pasting a piece of paper, the indicator (3) may be coated on the container to form a coating film, and the upper surface thereof may be covered with a protective film having the properties described above. While the product is in storage after shipment, the indicator (3) changes color over time due to exposure to outside air, and after a predetermined period of time, it reaches its final predetermined color.

Thus, for example, if the color changes from white to light purple to purple over a period of six months, it is convenient to be able to easily determine the shelf life of the product even from a distance. In addition, using the indicator of the present invention, as shown in the second diagram, in the case of sealed food such as canned food or bottled food, the indicator is pasted on the inner surface of the lid (1a) of the sealed food container (1). If you do this, you can know how long it will last after opening the can.

Furthermore, if necessary, a standard indicator [5] printed in three colors of white, light purple, and purple can be arranged side by side with the indicator of the present invention (3) as shown in the first diagram to enable more accurate and detailed reading. It is preferable to do so.

Next, more detailed examples will be described.

A 6Mi class time indicator was created as follows.

(a) 0.2% diphenylamine dilute sulfuric acid solution 0.1-ml and 1% ferrous sulfate dilute sulfuric acid solution 1ml, 1% warm agar aqueous solution M were added to obtain a preparation solution.

(b) Add 0.2% sodium diphenylsulfonate aqueous solution 01- and 1% potassium ferrocyanide aqueous solution 1- to 100 me of warm agar aqueous solution to obtain an adjusted solution. (C) 0.02% methylene blue aqueous solution 1- and 1-thiacetaldehyde ethanol solution 1- were combined with 1% warm green natural water bath solution 100- to form a vIAi solution.

(d) 0.2% Eriogreen B ethanol solution 0.2
- Add 11% thioglycolic acid 0.1- and 0.1% stannous chloride aqueous solution to 100-1% hot water solution to adjust the temperature. Especially 0 (e) 0.2'% Eriogreen B ethanol solution 0.21n! , 0.1% thioglycol Iff O,1
- and 0.1% of an aqueous solution of stannous chloride were added to 100% of a 1% agar bath solution to obtain a preparation solution 1.

(f) 0.2% Eriogreen B ethanol solution 0.
2m, 1% 1-thioglycolic acid and 0.1-thioglycolic acid
A prepared solution was obtained by adding 0.1 - of the tin aqueous solution to 100 - of the IL% agar aqueous solution.

For each of these adjustment solutions (a) to (f), the inner diameter is 1 cIn
3 people were placed in a transparent glass tube, cooled and solidified, and time indicators A, B, 0. D.E.

I got an F. A membrane was applied to the open end of the tube to prevent water passage but allow air to pass through, and the period until the color of each indicator reached the final predetermined color was measured. The results were as shown in the table below.

Soak porous paper in the above-mentioned adjustment solution and drain the water to obtain a time indicator containing the adjustment solution.
- Used in a bag with a membrane to pass through and adhered to a transport container, and used for products with a discoloration period of 3 months. Thus, according to the present invention, a redox indicator and air oxidation are applied to a water-containing substrate. Since the time indicator was created by coexisting with a substance that is

[Brief explanation of the drawing]

Figure 1 of the drawings is a perspective view of a time indicator according to an example of the present invention in use, and Figure 2 is a cross-sectional view of a portion of an embodiment of the present invention. ...Time indicator (4)...Protective film Patent applicant: 2 persons other than Riken Fragrance Industry Co., Ltd. Figure 1 Figure 2 Procedural amendments Showa 595 December 4, 1982 To the Commissioner of the Japan Patent Office'', case display 1988 Patent Application No. 232227 2, Name of the invention 4, Time indicator 3, Relationship with the case of the person making the amendment Patent applicant ~ Riken Perfumery Industry Co., Ltd. 6. Detailed explanation of the invention in the specification subject to amendment 7, Contents of amendment 111 150FrL on page 2 of the specification, lines 12 and 13
l/day -cnt s o a arnlla&y
ctA J to ``5 D ml/m・day・atm
23℃Dry ~a (100ml/m” @day-a
tm 23"CDryJvc is corrected. (2) "Hibitin" on page 3, line 14 of the same book is corrected to [Hibiten J. (3) Correct “carrageena” to “carrageenan” in line 16 of the same page. (4) Corrected to "Resazorin 1. Sakuranin TJ'krResazurin, Su7 Ranin T" in the same page, line 18 of the same book. t51 Correct "methine blue" to "methylene blue" in line 19 of the same page of the same book. (6) Corrected to [diphenylbenzidine Jt-r diphenylbenzidine] from page 3, line 20 to page 4, line 1.

Claims (1)

[Claims] 1. A time indicator consisting of a liquid containing a redox indicator and a substance that is oxidized by air.