JP2002284137A - Thermal insulating paper cup with color tone changing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing layer, which changes in color according to temperature change, on the outer surface of the body portion of a thermal insulating paper cup. SOLUTION: A thermal insulating sheet 20 in which a surface layer 21 and a thermal insulating material layer 22 are laminated, is wrapped in a circumferential direction on a body portion of a paper cup body 10 which is composed of a body portion 11 and a bottom portion 12, has a rim portion 13 curled outwardly on the periphery of an opening portion, and is formed with an annular foot portion 14 at a connecting portion between the body portion and the bottom portion to form this thermal insulating paper cup 1 with the color changing function, and the surface layer of the thermal insulating sheet is provided with a printing layer 23 which changes in color according to the temperature change.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating paper cup in which the color tone of the outer peripheral surface of a paper cup changes with a change in temperature.

[0002]

2. Description of the Related Art Products having a printed layer on the surface of a paper cup that changes color due to a change in temperature are conventionally known, and various paper cup products that make use of the fun and enjoyment of discoloration have been planned.

Further, a so-called paper cup in which a heat insulating sheet in which a surface layer and a heat insulating material layer are laminated is wrapped around the body of a paper cup to form a heat insulating paper cup, in which instant noodles are stored and sealed with a lid material. There is a noodle container. In this paper cup noodle container, after the lid material is peeled off, hot water is poured into the hot water line, the lid is closed again, and after about 3 minutes, the lid is opened and the noodles are eaten.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an approximate temperature on the surface of a paper cup noodle container can be estimated by providing a printed layer which changes color due to the above-mentioned change in temperature. It is an object of the present invention to provide a heat-insulating paper cup having a function of changing the color tone of the body of a container when it is ready to be eaten and teaching that the noodles are ready to be eaten.

[0005]

According to a first aspect of the present invention, there is provided a heat insulating sheet having a surface layer and a heat insulating material layer laminated on each other. A heat-insulating paper cup of a paper cup body having an annular leg formed at the joint between the body and the bottom, the heat-insulating sheet being discolored due to a change in temperature on the surface layer of the heat-insulating sheet. A heat-insulating paper cup with a color tone changing function, characterized in that a printed layer is provided.

[0006] Since the surface layer of the heat insulating sheet is provided with the printing layer that changes color due to a change in temperature as described above, it is easy to eat, for example, by observing the change in the color tone of the printing layer formed on the surface of the heat insulating paper cup. And the temperature of the outer surface of the container can be determined just by looking at the container without touching the container.

According to a second aspect of the present invention, in the first aspect of the present invention, the color change temperature range of the print layer is 40 to 60 °.
A heat-insulating paper cup with a color tone changing function, which is in the range of C.

As described above, since the color tone changes in the temperature range of 40 to 60 ° C., the color does not change at a temperature around the body temperature.
The color does not change just by holding it by hand, nor is it hot and impossible to hold.

[0009] The invention of claim 3 is based on claim 1 or 2
In the invention of the above item, the contained matter is instant noodles, and the formation range of the printed layer that changes color due to the change in temperature is a range from the surface of the hot water to be poured to the junction between the body and the bottom. Insulating paper cup with change function.

As described above, since the formation area of the print layer in which the color tone changes with the temperature change is large, the change in the color tone can be recognized at a glance.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat-insulating paper cup with a color tone changing function of the present invention will be described in detail below based on one embodiment.

As shown in FIGS. 1 and 2, for example, a heat insulating sheet (20) in which a surface layer (21) and a heat insulating material layer (22) are laminated as shown in FIGS. ) Has a lip (13) composed of a body (11) and a bottom (12), and the periphery of the opening is curled outward, and an annular leg (14) is formed at the junction between the body and the bottom. In the heat-insulating paper cup which is wound in the circumferential direction of the body of the paper cup body (10), a printing layer (23) that changes color due to a change in temperature is provided on the surface layer (21) of the heat-insulating sheet (20). Things.

The heat insulating sheet (20) is a sheet in which a surface layer (21) and a heat insulating material layer (22) are laminated, for example, a sheet made by embossing paper or corrugated paper and pasting paperboard or thin paper. Can be used.

The printing layer (23) formed on the surface layer (21) made of paperboard or thin paper has a function of discoloring due to a change in temperature. This was made possible by using a metamocolor ink (trademark of Pilot Ink Co., Ltd.), which was a thermochromic material based on an electron transfer mechanism based on thermal equilibrium in the compound.

The metamo color ink is that the color tone of the ink changes to another color tone in a certain temperature range.
For example, at room temperature, the printing layer that is purple is 40 to 60 °
In the range of C, the color changes to a pink print layer. The temperature range in which the color tone changes has a range of about ± 3 ° C.

The metamocolor ink can form a printing layer (23) on a paperboard or thin paper as a surface layer (21) by a usual gravure printing method. The printing layer may be provided on the entire surface layer or may be provided partially on the surface layer.

The printed layer (23) having the function of discoloring due to a change in temperature on the surface layer (21) thus produced.
The heat-insulating sheet (20) on which the opening is formed has a rim (13) composed of a body (11) and a bottom (12) separately prepared, and the periphery of the opening is curled outward. Paper cup body (10) having an annular leg (14) formed at the joint
Is wound in the circumferential direction of the body portion to form the heat insulating paper cup (1) of the present invention.

At this time, the printing layer (23) is formed in a range from the water surface (15) of the hot water to be poured to the upper side of the annular leg (14), which is a junction between the body and the bottom,
The formation range of the print layer is widened, and the change in color tone can be recognized at a glance. In addition, the water surface (15) of the hot water to be poured usually exists about 20 mm from immediately below the lip (13).

When the lid material of the paper-made cup noodle container containing the instant noodles is peeled off from the heat-insulating paper cup, hot water is poured into the heat-insulated paper cup, and the lid is closed again and left as it is, the initial state formed by the metamocolor ink The purple printed layer turned pink after 1 minute.

[0020]

The present invention will be described in detail with reference to the following examples. <Example 1> Water surface (15) of hot water poured into a printing layer when it is wound around a paper cup body around thin paper to be a surface layer (21)
From room temperature to purple,
A printing layer (23) was formed by a gravure printing method (plate depth: 45 μm) using a metamocolor ink that changes color to pink in a temperature range of 40 to 60 ° C. The thin paper on which the printed layer (23) was formed and the embossed paper as the heat insulating material layer (22) were bonded together to obtain a heat insulating sheet (20).

Separately, a generally known paper cup forming machine is used to have a rim portion (13) composed of a body portion (11) and a bottom portion (12), the periphery of the opening of which is curled outward. A paper cup body (10) having an annular leg (14) formed at the joint between the and the bottom was produced.

The body (11) of the paper cup body (10)
Then, the previously produced heat insulating sheet (20) was bonded so as to be wound in the circumferential direction to obtain a heat insulating paper cup having a color tone changing function as shown in FIG. In addition, the printing layer (23)
Is formed in a range from the water surface (15) of the hot water to be poured to the annular leg.

Hot water is poured into the heat-insulating paper cup on the water surface (1).
Pour until 5), immediately after pouring and after 1 minute
-E, the surface temperature of the outer surface of the body at five locations was measured, and the discoloration degree of the printed layer after 1 minute was visually observed.
Table 1 shows the results. A ５ 5 mm below the bottom B ５ 5 mm above the bottom C 中央 Central part of the trunk D ５ 5 mm below the hot water entry line E ５ 5 mm above the hot water entry line ○ 変 Discolored to pink △ ‥ Pink and purple Discolored to neutral color

[0024]

[Table 1]

From these results, it was found that the outer surface temperature of the trunk was 37 °.
At C, the discoloration of the printed layer is insufficient, but at 42 ° C., the discoloration is sufficient.

[0026]

As described above, it can be seen that the heat-insulating paper cup with a color tone changing function of the present invention has a decoration function as well as a temperature display function.

[Brief description of the drawings]

FIG. 1 is a partially sectional explanatory view showing an embodiment of a heat insulating paper cup with a color tone changing function of the present invention.

FIG. 2 is a partial cross-sectional explanatory view showing one embodiment of a heat insulating sheet used for a heat insulating paper cup with a color tone changing function of the present invention.

[Explanation of symbols]

 1 Heat-insulating paper cup 10 Paper body 11 Body 12 Bottom 13 Edge 14 Joint between body and bottom (annular leg) 15 Water surface of hot water 20 Heat insulation sheet 21 Surface layer 22 Heat insulation layer 23 Printing layer

Claims (3)

[Claims] 1. A heat insulating sheet comprising a surface layer and a heat insulating material layer laminated on a body and a bottom, the opening having a rim which is curled outward, and an annular portion formed at a joint between the body and the bottom. In a heat-insulating paper cup wound around a body portion of a paper cup body having legs formed thereon, a color-changing function characterized in that a surface layer of the heat-insulating sheet is provided with a printing layer that changes color due to a change in temperature. Insulated paper cup with. 2. The color tone change temperature range of the printing layer is 40-60.
The heat insulating paper cup with a color tone changing function according to claim 1, wherein the temperature is in the range of ° C. 3. A product containing instant noodles, wherein the range of formation of the printed layer that changes color due to a change in temperature is a range from the surface of the hot water to be poured to the junction between the body and the bottom. The heat-insulating paper cup with a color tone changing function according to claim 1, 2 or 3.