JPS5852904B2 - Method for manufacturing insulated containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat insulating container, and more particularly to a method for manufacturing a heat insulating container (insulating cup) for instant foods, etc., which is swollen by heating in boiling water.

Conventionally, the above-mentioned insulated food containers have been made by wrapping a foamed resin sheet around the outer periphery of a non-foaming hard plastic container, or by wrapping corrugated material around the container, which is then wrapped with a heat-shrinkable plastic film. something is known.

The manufacture of such a heat-insulating container requires a lot of time and effort, as it involves a step of wrapping a foamed resin sheet or a coal gate material, and a step of wrapping it with a heat-shrinkable plastic film.

In addition, there was a desire to develop a heat-insulating container with even better heat-insulating effects.

The present invention was made in view of the above circumstances, and its purpose is to provide a method for manufacturing a heat-insulating container that simplifies the packaging work during production and at the same time provides a good heat-insulating effect. It is in.

That is, the method for producing a heat-insulating container of the present invention includes covering the container surface with a heat-shrinkable plastic film coated with a heat-foamable material on one or both sides, and then heating to shrink the heat-shrinkable plastic film. It is characterized in that it is brought into close contact with the surface of the container and the thermally foamable material is foamed to impart heat insulating properties to the container.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a packaging film 3 made by coating a heat-shrinkable plastic film 1 with a heat-foamable substance 2. Film 3 is shown.

The container is coated by heat-sealing both ends 4.5 of the heat-shrinkable plastic film 10.

Heat-shrinkable plastic films include stretched,
Alternatively, unstretched polypropylene film, polyethylene film, vinyl chloride film, etc. can be used.

As the thermally foamable substance 2, a foamable ink containing granular vinyl chloride or the like containing a foaming agent can be used.

The heat-foamable material 2 can be applied to the heat-shrinkable plastic film 1 by a conventional printing method such as offset printing, gravure printing, or silk printing.

Printing is not done by coating the entire surface as shown in Figure 1.
It can be applied as a partial application as shown in Figures 2 or 3, or as a regular or irregular pattern to give the container an aesthetic appearance.

The container is wrapped by covering the container with the packaging film 3 thus obtained and heating it.

That is, when heated, the foamable substance 2 is foamed and the heat-shrinkable film 1 is shrunk to perform shrink packaging, thereby obtaining a heat-insulating container having good heat insulation properties.

As shown in Figure 4j5.6, the packaging is as follows: (Figure 4) for the entire container 6, and (5) for the part of the container 6 excluding the lower part.
(Fig. 6) or against the side of the container 6 (Fig. 6).

Figure 4.5.6 shows the state before heating, and the front view shows the state after heating, when packaging is completed.

The center portion 7 of the top surface of the lid of the container 6 may be unwrapped, as shown in the opening view of FIG.

7 and 8 show a cross section of a heat-insulating container according to the present invention, and the heat-insulating container in FIG. Heat-shrinkable plastic film 1 coated with substance 2
It is coated with

Both ends 4.5 of the heat-shrinkable plastic film 10 are overlapped and bonded together.

The heat-insulating container shown in FIG. 8 is a bag made by heat-sealing both ends 4 and 5 of a heat-shrinkable plastic film 1.

As described above, the heat-insulating container of the present invention provides a heat-insulating effect to the container by foaming a heat-foamable substance at the same time when the outer packaging of the container is performed by heat-shrinking the heat-shrinkable plastic film. be.

Therefore, even if a low-foaming material is used, since it is covered with a heat-shrinkable plastic film, the shrinkage rate of the heat-shrinkable plastic film is taken into account in addition to the foaming ratio of the foamable material, resulting in an even greater insulation effect. is demonstrated.

Furthermore, in the method for manufacturing a heat-insulating container of the present invention, the conventional step of wrapping corrugated material, foamed sheet, etc. around the container is removed, which simplifies the work and reduces costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a packaging film used in the present invention, where the A diagram shows a flat packaging film and the front diagram shows a curved packaging film. FIGS. 2 and 3 are views showing other packaging films used in the present invention, in which each figure shows a cross-sectional view and each figure shows a top view. FIGS. 4, 5, and 6 are diagrams showing packaging of a container with a packaging film, and each figure shows the state before packaging, and the opening diagram shows the completed state after packaging. 7 and 8 show cross-sectional views of the heat insulating container of the present invention. DESCRIPTION OF SYMBOLS 1... Heat-shrinkable plastic film, 2... Heat-foamable material, 3... Packaging film, 6... Container.

Claims (1)

[Claims] 1. A heat-shrinkable plastic film coated with a heat-foamable material on one or both sides is coated on the container surface, and then heated to shrink the heat-shrinkable plastic film and bring it into close contact with the container surface. A method for manufacturing a heat-insulating container, which comprises foaming a substance to impart heat-insulating properties to the container.