JPH0637990Y2 - Food packaging with temperature sensitive display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a package for food such as refrigerated food, chilled food or frozen food which requires temperature control for storage.

Conventional technology Refrigerated foods, chilled foods, or frozen foods are stored and displayed in refrigerated or frozen showcases during the distribution process in grocery stores or supermarkets, but temperature control is exclusively installed in the showcases. In reality, it depends on the thermometer, and it is hardly checked whether each food is actually in a predetermined temperature range.

On the other hand, in the case of storage at home, a refrigerator or freezer is mixed with various other foods, and the temperature of each food is not necessarily the temperature displayed by the thermometer in the storage depending on the storage position in the storage and the amount of the stored items. It does not match.

DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention The present invention is intended to provide a food package capable of visually judging whether or not each food is kept in a predetermined temperature range.

Means for Solving the Problems The constitution of the food package of the present invention is such that a substantially transparent plastic film having a temperature-sensitive display layer formed by a reversible temperature-sensitive ink on at least a part of one surface is a surface of the display layer. Is a molded body made of a laminated body in which the surface of a plastic sheet material is laminated.

When the food is packaged in the package, the display layer is arranged so as to be visible from the outside.

As the material of the plastic film and the plastic sheet, general-purpose plastic materials such as polyethylene, polypropylene, polystyrene and polyvinyl chloride are used, but polystyrene is most often used. Although foamed plastic sheets are commonly used for food packaging trays, they are of course applicable to the package of the present invention.

As a reversible temperature-sensitive ink, a printing ink proposed by the applicant of the present invention that changes color reversibly according to a temperature change (Japanese Patent Publication No. 52-77).
No. 64) is preferably used, and for frozen foods, chilled foods, and foods requiring refrigeration, inks having discoloration temperatures of about -15 ° C, -5 ° C, and + 5 ° C, respectively, are applied. The display with these inks is in a colored state in one temperature range in the upper and lower temperature ranges sandwiching the color change temperature, and is in a colorless state in the other temperature range, or exhibits different colors in both temperature ranges. .

The display layer is optionally backed with white or light color ink to enhance the contrast effect of the display.

Action The individual food packages provided with the temperature-sensitive display layer faithfully reflect the object temperature of the food package itself and display whether or not it is in a temperature range below a predetermined temperature.

Examples Examples will be described below.

FIG. 1 of the drawings shows a vertical section of a food packaging tray of the present invention.

With a reversible temperature-sensitive ink, a polystyrene film printed on one side shows a blue color in a predetermined area where the pattern is not printed, at a temperature of about -15 ° C or lower, and becomes colorless in a temperature range above the temperature. A character surface layer of "in cold storage" is provided, and a heat-fusible white ink is lined, and the surface is brought into contact with a polystyrene foam sheet and thermocompression-bonded. It was processed and formed into a food packaging tray. The display layer was arranged to be located on the upper edge of the tray.

This tray is used as a frozen food package.

FIG. 2 of the drawing shows a vertical sectional view of the food packaging container of the present invention.

A reversible temperature-sensitive ink that shows a blue color at a temperature of about + 5 ° C or less and becomes colorless at a temperature above about + 5 ° C in a predetermined part of the surface of a polystyrene film on which a pattern is printed A character display layer 2 ′ of “medium” was provided, and a laminate obtained by laminating this surface on one surface of a polystyrene sheet with an adhesive was preheated and then hot embossed to form a lid of the container. The display layer 3'was arranged on a part of the top surface of the lid.

Separately, it is used in combination with a container body molded from polystyrene material as a package for food requiring refrigeration.

Effect of the Invention FIG. 3 shows a state in which the temperature-sensitive display of the tray shown in each of FIGS. 1 and 2 changes due to a temperature change, and when the tray is in the temperature range A of −15 ° C. or less, “in cold storage” is displayed. The display appears,
In the temperature range B exceeding -15 ° C, the display layer portion is plain.

As described above, the food package of the present invention displays whether or not it is kept at a predetermined temperature or less by a color change, so that a person can visually recognize the storage temperature state of the packaged food at a glance. It provides simple and accurate information on the temperature control of the refrigerating or freezing showcase in the distribution process, the temperature control of the refrigerator or freezer in the home, and the adjustment of the food storage amount.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a food packaging tray of the present invention, and FIG. 2 is a vertical sectional view of a food packaging container of the present invention. FIG. 3 shows the states before and after the change in the temperature-sensitive display of the food package shown in FIGS. 1 ... Transparent plastic film 2, 2 '... Temperature-sensitive display layer 3 ... Pattern printing 4 ... Foamed plastic sheet material 5 ... Plastic sheet material 6 ... Lid 7 ... Container body

Claims (1)

[Scope of utility model registration request] 1. A food package formed by laminating a transparent plastic film printed on one surface with the printed surface being in contact with the surface of a plastic sheet material. Part has a discoloration temperature of about -15
C., -5.degree. C. or 5.degree. C., which is a temperature-sensitive display using a reversible temperature-sensitive color-changing ink, and at least one of the temperature-sensitive displays presents a character meaning "cold state" at a temperature lower than the color-changing temperature However, a food package with a temperature-sensitive display, which is a display that becomes colorless and invisible at a temperature above the discoloration temperature.