JPH0318329Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a wrap-type composite container suitable for storing liquids and the like.

BACKGROUND ART Conventionally, various types of composite containers have been used to store liquids, powders, etc. Particularly in the case of containers that store liquids, the sealing between the container opening and the lid is an issue, and currently aluminum foil is used as the lid, and adhesive is attached to either or both of the container opening flange or the aluminum foil. A method that is often used is to apply an agent and then overlap and bond the two.

In addition to using such aluminum foil, for example, a synthetic resin flange or hakama-shaped part that fits into the mouth of the container can be made by injection molding on the periphery of the paper-like material that will become the top surface. Some are formed into lids with desired structures.

Furthermore, there is a limit to the ability to obtain thin synthetic resin containers by injection molding because the thinner the wall, the more technically difficult it becomes. Therefore, when manufacturing thin containers, the flexible panel material that will form the walls of the final container is pushed into an injection mold and fixed, and the remaining cavity of the mold is filled with synthetic resin. Composite containers are known that are injected to form a framework that joins panel materials together.

Since these composite containers can use various flexible materials as panel materials constituting the wall surface, their uses are wide-ranging.

Conventionally, when using this type of composite molded product as a packaging container or food container, the method of filling the container with the desired contents and then sealing the opening with metal foil, etc., or using a synthetic resin lid with screws. The common method was to stop and seal it.

Problems to be Solved by the Invention However, in composite containers sealed using conventional techniques, sealability has become a problem, especially when the internal pressure of the container is high. In particular, if there is water on the opening of the container, the seal is likely to fail. In addition, heat welding has the disadvantage of producing a burnt odor from the synthetic resin.

This invention was made in view of the actual state of the prior art as described above, and the object is to provide a seam-type composite container that can particularly improve sealing performance.

Means for Solving the Problems The gist of the present invention is to provide a framework made of synthetic resin material at required parts of the panel material made of flexible material constituting the container for the purpose of joining and reinforcing the panel material. The composite container has an upper edge rib formed as one of the frames on the upper edge of the container side wall, a lid whose outer periphery is sealed by wrapping around the upper edge rib, and an upper edge rib extending outward from the outer surface of the container side wall. Separately, there is a pressure-receiving protrusion formed integrally with the frame from a synthetic resin material near the upper-edge rib so as to extend outward from the upper-edge rib, and a pressure-receiving protrusion formed on the lower surface of the pressure-receiving protrusion and supported from below by a pressure-receiving stand. The present invention relates to a seam-clamp type composite container, characterized in that it is provided with a pressure-receiving surface for the purpose of the present invention.

Effects: In the composite container of the present invention, the pressure receiving protrusion is provided as described above, so by supporting the pressure receiving protrusion from below with a pressure receiving stand, etc., the lid can be securely and easily tightened to the upper edge of the side wall of the container. can be done. Moreover, since the pressure-receiving protrusion is located near the upper edge rib, the downward pressing force against the lid can be increased. For example, when the container opening is 5 cm, a downward load of 70 kg is required, but sufficient strength can be obtained. the result,
The lid and the opening of the container have a sealing property, and even if water or particulate foreign matter (such as tangerine grains) remains between the lid and the opening of the container, the seal can be reliably sealed. Moreover, the sealing processing time can be shortened and the sealing speed can be increased. Since double seaming can be performed if necessary, very high sealing performance and productivity can be obtained. Particularly when filling at high temperatures, the framework tends to soften, and at that time, a decrease in strength is unavoidable, but the above-mentioned effects of the present invention are extremely significant.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

After preliminarily applying desired printing to a flexible material, it is punched into a shape as shown in FIGS. 1 and 2, for example, to produce panel materials 4, 5, and 6. As shown in FIG. 1, the shape of the panel material 6 forming the bottom wall of the container is not only circular, but also can be of any shape depending on the purpose.

The panel materials 4, 5, and 6 that have been cut into appropriate shapes by such punching or the like are bent to form the bottom wall 2 and side wall 1 of the container.

In order to form a framework for joining the panel materials 4, 5, 6, the panel materials 4, 5, 6 are held in an injection mold 10 having a desired gap, as shown in FIGS. 3 and 4, for example. Then, a molten thermoplastic synthetic resin is injected into the bone composition molding cavity of the mold 10 to form the mold.

The mold 10 is composed of a core tool 11, cavity tools 12 and 13, and a first
Panel materials 4, 5, and 6 as shown in FIG. 2 are positioned around the core tool 11. The cavity tools 12 and 13 are divided into two parts. core tool 1
There is a suction hole in the center of the tip of core tool 11.
The panel materials 4, 5, and 6 are adsorbed when the panel is pushed in to prevent displacement. Before the core tool 11 reaches its maximum stroke, the cavity tool 12 is set in position for injection molding. Injection is performed in the state shown in FIG. 3, and a composite container as described later is molded. Cavity tool 12 is released before core tool 11 begins to return. When returning, the core tool 11 is separated from the cavity tool 13 while adsorbing the molded container through the suction hole.
At the position where the molded container can be separated, compressed air is discharged from the suction hole, separated and discharged from the core tool 11.

As shown in FIGS. 5-7, the injection molded composite container consists of a side wall 1, a bottom wall 2 and a lid 3. The upper edge rib 7 serves to secure the upper end of the side wall of the container and to reinforce the opening of the container. The lower edge rib 8 serves to connect the lower end of the side wall 1 of the container and the periphery of the container bottom wall 2, and at the same time serves to reinforce the container bottom wall 2. The side wall ribs 9 serve to join the ends of the side wall forming panel materials 4 and 5, to connect the upper edge ribs 7 and the lower edge ribs 7, and to reinforce the container side wall 1.

In the embodiment of FIGS. 5-7, a double seam is provided. A pressure-receiving protrusion 20 is formed on the upper outer surface of the outer wall 1 of the container from a synthetic resin material integrally with the frame.
While supporting the pressure receiving protrusion 20 from below with the pressure receiving table 21, a well-known roll-type seaming means (not shown) is used.
Tighten the circumferential edge of the lid 3, the container side wall 1, and the upper edge (that is, the upper edges and upper edge ribs 7 of the panel materials 4 and 5) with the seventh
Transform it into the state shown in the figure.

The materials for the panel materials 4, 5, and 6 are preferably flexible, and specifically, for example, ink/PE/paper/adhesive/aluminum foil/PE are arranged in this order from the outside to the inside. It is better to use In addition, there are also paper, paper impregnated with synthetic resin, paper laminated with synthetic resin film, paper laminated with metal foil, synthetic resin film, metal foil, and metal foil laminated with synthetic resin film. It can be selected as appropriate depending on the purpose, such as a laminate of paper, a synthetic resin film, and a metal foil.

An example of the material for making the lid 3 is the upper edge rib 7.
It is preferable to use a plastically deformable material that can maintain the tightened state, such as a material mainly made of aluminum plate or tin plate.

Further, the thermoplastic synthetic resin that can be used for forming the framework may be of any type as long as it is normally used in injection molding, such as styrene resin, vinyl chloride resin, olefin resin,
Examples include polyamides, polyesters, acrylic resins, etc., and are appropriately selected and used depending on the intended use of the final composite container. Of course, antioxidants, ultraviolet absorbers, dyes, pigments, organic/inorganic stabilizers, blowing agents, and other additives may be mixed with this thermoplastic synthetic resin as long as they do not harm the composite container. be.

Each of the embodiments shown in FIG. 8 and subsequent figures has substantially the same structure as the previous embodiment except for the shapes of the upper edge rib 7 and the side wall panel members 4 and 5. The same reference numerals indicate the same or corresponding members.

In the embodiment shown in FIG.
0 is formed in a ring shape. The upper edge rib 7 extends upward from the upper ends of the panel members 4, 5.

When tightening the lid 3, move the pressure receiving base 21 to the pressure receiving protrusion 2.
The cover 3 is supported on the lower surface of the container opening as shown by the chain line, and is tightened to the opening of the container by a roll-type or Jyo-type tightening means to the state shown by the solid line (single-sealing).

Note that a pull tab 3a is attached to the top surface of the lid 3.

In the embodiment of FIG. 9, the upper edge rib 7 extends past the upper ends of the panels 4, 5 to the upper outer surface of the container side wall 1. A pressure receiving projection 20 is formed in a ring shape on the side wall 1 of the container immediately below the upper edge rib 7. This pressure-receiving projection 20 is supported from below by a pressure-receiving table 21, and the lid 3 is tightened around the upper edge rib 7 as shown by the chain line using a tightening means (claw) of the tightening method. Although not shown, a gasket may be interposed between the lid 3 and the upper edge rib 7.

The embodiment shown in FIG. 10 has almost the same structure as the embodiment shown in FIG. has been done. This makes it possible to increase the downward pressing force when tightening.

Furthermore, during injection molding, the synthetic resin passes from the side wall rib 9 to the outside of the container side wall 1 through the gap between the ends of the panel materials 4 and 5, forming the pressure receiving protrusion 20. This is desirable because of the smooth flow of the synthetic resin during molding.

[Brief explanation of the drawing]

Fig. 1 is a developed view showing an example of a panel material used for multiple containers, Fig. 2 is a cross-sectional view taken along line X-X in Fig. 1,
FIG. 3 is a sectional view taken along the Z-Z line in FIG. 4 showing an example of a mold for injection molding a composite container, and FIG.
Y sectional view, FIG. 5 is a sectional view showing an example of the composite container before seaming, FIG. 6 is a partially enlarged view thereof, and FIG. 7 is a view showing the state of the side wall of the composite container after seaming.
Figure 8 is a sectional view showing the state of another composite container after seaming, Figure 9 is a diagram showing the state of another composite container before seaming, and Figure 10 shows the state of seaming of another composite container. FIG. 1... Container side wall, 2... Container bottom wall, 3... Lid, 4,
5, 6... Panel material, 7... Upper edge rib, 8... Lower edge rib, 9... Side wall rib, 10... Mold, 20... Pressure receiving protrusion.

Claims (1)

[Scope of utility model registration request] In a composite container, a frame made of a synthetic resin material is provided at a required part of a panel material made of a flexible material constituting the container for joining and reinforcing the panel material,
An upper edge rib formed as one of the frames on the upper edge of the container side wall, a lid sealed by wrapping the outer periphery of the upper edge rib, and an upper edge rib separate from the upper edge rib facing outward on the outer surface of the container side wall. A pressure-receiving projection formed integrally with the framework from synthetic resin material near the upper edge building so as to extend outward from the upper edge of the building, and a pressure-receiving surface formed on the lower surface of the pressure-receiving projection to be supported from below by a pressure receiving stand. A cinching-type composite container characterized by being provided with.