JPS6119067Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a foldable paper container.

Conventionally, bottle-shaped paper containers have been formed into a specified bottle shape from the viewpoint of strength and sealing.
It was customary to maintain its shape. for example,
If the place where the paper liquid container is manufactured is far from the place where the liquid is injected, the container must be transported in its bottle shape even though the inside of the container is empty. In that case, the volume occupied by the container becomes significantly large, which has the disadvantage of increasing transportation costs.

Considering these circumstances, the purpose of this invention was to make the container collapsible, reduce the volume occupied by the container when transported empty, and provide good squeezing properties when used, especially for viscous contents. An object of the present invention is to provide a paper container that can be easily taken out.

Embodiments of this invention will be described below with reference to the drawings.

1 and 2 show an embodiment of this invention. The body frame 1 is made of paper and has enough rigidity to be able to stand on its own in a liquid filling machine. For example, the body frame 1 may be made only of paper, but may also be made of plastic or a combination of other materials. After the surface of the cylinder frame 1 has been printed, it is also possible to coat the surface with a thin film of plastic.

Furthermore, ruled lines 2 are formed on the body frame 1 for folding it into a predetermined shape. For example, the ruled line 2 is made thinner by applying linear pressure to a predetermined portion of the body frame 1, so that bending is always performed along the thin linear portion. In the example shown in FIGS. 1 and 2, a total of six ruled lines 2 are formed in the vertical direction. The position of ruled line 2 is preferably such that folding does not degrade the product image.

The container body 3 is made of thermoplastic resin such as polypropylene into a bottle shape by blow molding. The container body 3 can be integrally welded to the body frame 1 during blow molding. Of course, use adhesive or other adhesive to attach the container body 3.
may be fixed to the body frame 1.

The wall thickness of the container body 3 is made thin enough to be foldable. For example, the shoulder part of the container body 3 is
The thickness should be 160 microns, the body should be 90 microns, and the bottom should be 120 microns thick. Depending on the material and shape, these thicknesses can be made even thinner.

Next, an example of a method for manufacturing the above-mentioned paper liquid container will be explained.

In the blow molding process, when the molds 4, 4 are open, a previously manufactured body frame 1 is set in a predetermined position in the molds 4, 4. On the other hand, a parison 6 held by a blow molding head 5 is inserted into the molds 4, 4. The molds 4, 4 are closed to produce the state shown in Figure 3. Next, air is blown into the parison 6 to expand the parison 6, which is in a high-temperature softened state. As a result, the parison 6 is welded to the inner wall of the body frame 1 and adheres closely to the inner wall of the molds 4, 4, forming a bottle shape. After that, the molds 4, 4 are opened to obtain a liquid container as shown in Figure 1. The liquid container is folded along the lines 2 to produce the state shown in Figure 2.

In the case of a rectangular container, the number of ruled lines 2 can be four. The body frame 1 can also be shaped with a bottom. Furthermore, the shape of the container is not limited to a rectangular shape, but may also be cylindrical.

This idea has the following effects.

Generally, in the case of blow molding, the body portion of the container body 3 tends to be thin. However, the trunk frame 1 exists in that part. Therefore, when the shoulder portion and bottom portion of the container body 3 are made to have the desired wall thickness, the body portion becomes too thin, but since it is reinforced by the body frame 1, no strength problems occur. Rather, the thinner the body portion of the container body 3 is, the easier it will be to fold the body frame 1. Moreover, damage due to folding is less likely to occur. In this way, a synergistic effect can be obtained regarding the container body when folding is taken into account.

When transporting ``empty'' containers, if the container is transported in a folded state, the bulk is 1/5 to 1/10 compared to the conventional transport of empty cans or empty bottles, significantly reducing transport costs. . For the same reason, when the container is disposed of after use, it is less bulky and easier to dispose of.

When the container is filled with liquid (including viscous substances), the container automatically inflates due to liquid pressure, assumes a predetermined bottle shape, and can stand on its own during use, which is convenient. In addition, since there are ruled lines, squeezing properties are good during use. In particular, it becomes easier to take out viscous substances.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a paper container according to this invention, Fig. 2 is a perspective view showing the paper container in a folded state, and Fig. 3 is a sectional view showing an example of the method for manufacturing the paper container. It is. 1... Trunk frame, 2... Ruled line, 3... Container body, 4
……Mold.

Claims (1)

[Scope of utility model registration request] A paper body frame having enough rigidity to stand on its own is formed with ruled lines for folding into a predetermined shape along the vertical direction in the free standing state, and a thermoplastic resin container body is blow molded inside the body frame. A collapsible paper container formed into a bottle shape, the container body having a wall thickness thin enough to be foldable.