JPH0455860B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a container using synthetic resin and suitable for storing food, for example, and a method for manufacturing the same.

[Prior Art] In recent years, containers made of synthetic resin have often been used in place of conventional containers such as canned goods. An example of this type of container is a bag-shaped container using a sheet made by laminating a synthetic resin film onto a metal foil such as Al. However, when this bag-like container is heat-treated, the distance to the center of heating is not uniform, so that, for example, the contents located near the edges are excessively heated, resulting in a significant drop in quality. Also,
If the bag-like container is kept in its original state, its strength is weak and it cannot be loaded in large quantities. In reality, each product must be packaged in a box, which increases manufacturing costs.

In response, a container was developed in which a cylindrical main body made of synthetic resin is fused to the outer surface of a peripheral film made of a synthetic resin sheet and the peripheral edge of a bottom film, which is convenient for lamination and does not cause quality deterioration during heat treatment. has been done. This container can be stacked without being individually boxed, so manufacturing costs are not high. However, this container is weak against impact in a direction perpendicular to the bottom surface, and the bottom film is easily damaged, so it does not have enough strength to withstand stacking. In addition, the cylindrical main body made of synthetic resin tends to have lower thermal conductivity than the bottom film made of synthetic resin, and the thermal conductivity of the cylindrical main body tends to be lower than that of the bottom surface. Therefore, there is a direction in which the thermal conductivity is poor during heating.

[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a container that has strength enough to withstand stacking and transportation, and has good thermal conductivity when heated from any direction. With the goal.

[Means for Solving the Problems] The container of the present invention has a bottom rib and a circumferential rib, and a cage-shaped reinforcing main body made of synthetic resin, and the bottom rib and the circumferential rib of the reinforcing main body. It is characterized by comprising a film that is fused and sealed between the ribs.

In addition, the method of the present invention includes a method in which at least one surface is made of synthetic resin in a mold having a bottom rib and a circumferential rib and a cavity forming a cage-shaped reinforcing body made of synthetic resin. A reinforcing main body is formed by arranging the film with one side in contact with the hollow part, and injecting a synthetic resin into the hollow part and solidifying the reinforcing main body. and fusing the film to the film.

The synthetic resin film used in the present invention includes:
A single synthetic resin sheet, a multilayer sheet of a plurality of synthetic resin sheets, or a multilayer sheet obtained by laminating a synthetic resin sheet and another material such as metal foil can be used. The multilayer sheet is made of synthetic resin with high gas barrier properties (e.g. vinylidene chloride copolymer (PVDC)) or metal foil (e.g.
Al) as the intermediate layer, and oriented polypropylene (OPP)
Alternatively, a gas barrier multilayer sheet in which unstretched polypropylene (CPP) is laminated as an outer layer or an inner layer is preferable.

The synthetic resin to be injected between the female mold and the synthetic resin film to form the reinforcing body is preferably polypropylene. It is preferable that the synthetic resin and the synthetic resin on the fused surface of the multilayer sheet are the same.

[Function] Since the container of the present invention is reinforced by the cage-shaped reinforcing main body, the film is less likely to be damaged.
Further, in this container, since the space between the ribs of the reinforcing main body is sealed with a film, the reinforcing main body is made of synthetic resin, which tends to have poor thermal conductivity compared to a film made of synthetic resin. Also, heat can be transferred evenly from the film between the ribs.

[Example] The present example will be described with reference to FIGS. 1 to 3 in the case where food is stored and preserved. Second
As shown in the figure, on the inner surface of the female mold 1 which has a cavity forming a cage-shaped reinforcing body 5 having a circumferential rib and a bottom rib as shown in FIG. A circular film 3 having approximately the same size as the outer surface to be inserted into the female mold is positioned. If the lower surface of the film 3 is made of synthetic resin, the other parts can be selected from various options depending on the application. For example, CPP/Al/
It can be formed of a multilayer sheet consisting of OPP layers. Further, this circular film 3 may be used as it is by cutting it into a circular shape in advance, or by inserting a large film into a male die (to be described later) into a female die and cutting the film within these molds. Good too.

Next, the male mold 2 is inserted into the female mold 1 so that the film 3 is attached to the male mold and supported within the female mold. In this case, the film 3 may be attached to the outer surface of the male mold in advance, and these may be inserted into the female mold 1 at the same time.

Next, the synthetic resin that is solidified to form the reinforcing body 5 is injected into the space provided between the hollow part of the female mold 1 and the film 3 through the injection port 4 provided in the female mold 1. . The synthetic resin may be any resin that can fuse the film, and is preferably the same synthetic resin as the lower surface of the film, and in this example, polypropylene. At this time, the film may be sheet-formed in advance, but sheet-forming of the film and injection molding of the reinforcing body may be performed simultaneously in a mold (insert molding).
is preferred.

After solidifying this synthetic resin, the female mold 1 and male mold 2 are removed to obtain a container having a cage-shaped reinforcing main body 5.

Food is stored in the container obtained in this way, for example,
After the opening is sealed with a lidding film made of a multilayer sheet consisting of CPP/Al/OPP layers, this is heat-treated.

As shown in FIG. 2, the container of this embodiment has a synthetic resin film 3 as an inner wall, and a cage-shaped reinforcing body 5 made of solidified synthetic resin surrounding the film 3. Reinforced. Further, the film 3 is fused to the reinforcing main body 5 to completely seal between the ribs of the reinforcing main body 5.

[Effects of the Invention] The present invention provides a container that has strength enough to withstand stacking and has good thermal conductivity when heated from any direction, and a method for manufacturing the same.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the container during manufacture, FIG. 2 is a partially cutaway front view of the manufactured container, and FIG. 3 is a bottom view of the manufactured container. 1...Female type, 2...Male type, 3...Film, 4
... Inlet, 5 ... Reinforcement main body.

Claims (1)

[Scope of Claims] 1. A cage-shaped reinforcing body having a bottom rib and a circumferential rib and made of synthetic resin, and a reinforcing body fused to the bottom rib and circumferential rib of the reinforcing body, and connecting between the ribs. A container comprising a sealed film. 2. A film having at least one side made of synthetic resin is placed in a mold having bottom ribs and circumferential ribs and a cavity forming a cage-shaped reinforcing body made of synthetic resin. A reinforcing main body is formed by arranging it in contact with the hollow part, and a synthetic resin is injected into the hollow part and solidified, and the reinforcing main body is fused to the film. A method for manufacturing a container, comprising the steps of: