JPH0242569Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a composite container made of a blank plate and injection molded resin. In particular, the present invention relates to a composite container which has a vacuum absorbing plate at the bottom and can absorb the vacuum generated inside the container when it is cooled by deforming the bottom when it is filled with a heated material and sealed.

BACKGROUND OF THE INVENTION For containers such as paperboard and plastic that are filled with heated materials and sealed, methods are known in which the lid or bottom plate is made of a flexible material or structure that can be turned over in order to absorb the decrease in internal pressure during cooling. A structure in which the lid is a vacuum absorption plate is disclosed in Japanese Utility Model Application No. 57-49473, but if the lid is made of a vacuum absorption plate, it has the disadvantage that it cannot be opened easily. Further, a structure in which the bottom plate member is a vacuum absorption plate is disclosed in Japanese Utility Model Application Publication No. 55-164112. The publication consists of a body member and a bottom plate member, the bottom plate member has a concave-shaped recessed portion in the center, and the peripheral edge of the bottom plate member is folded back for bonding with the body member. . When filling with heat, gas barrier properties of the container are generally required, and a high gas barrier material such as aluminum foil is normally used, but if metal foil is used as the bottom plate material, the above-mentioned folding process is difficult and wrinkles occur, causing pinholes. This is difficult to apply when metal foil is used, as there is also the concern that it may occur.

Furthermore, in Japanese Patent Application Laid-open No. 53-92870, the bottom plate is formed in a dome-shaped shape protruding inward from the container. (The purpose is to prevent deterioration of appearance due to
The edge of the bottom plate can be seen covered with injection molded resin, but since the blank including the bottom plate uses paper in addition to aluminum foil for the layer structure, the bending process required for a vacuum absorption plate is difficult, so it is difficult to perform the bending process required for a vacuum absorption board. Not suitable for absorption plates.

Purpose of the invention The purpose of the invention is to eliminate the above-mentioned drawbacks, to provide a vacuum absorption plate that is made by fitting a vacuum absorption plate containing a metal foil layer into the bottom plate, which is easy to install, and has good gas barrier properties without the risk of defects. The objective is to provide a composite container that is

Structure of the invention The composite container of the invention is a composite container made by supplying a blank plate made by connecting a plurality of body pieces with a bottom plate to an injection mold and joining the edges of the blank plate with injection molding resin. In the container, the outer periphery of a vacuum absorption plate made of a metal foil and an olefin resin laminated on both sides of the metal foil and the upper surface of the bottom piece are pasted and fitted into the opening of the bottom piece formed by opening the bottom plate of the blank plate. The apparatus is characterized in that the peripheral edge of the vacuum absorption plate, the body piece, and the bottom piece are covered with the injection molded resin.

Embodiment FIG. 1 is a front cross-sectional view of a composite container according to an embodiment of the present invention (showing a vertical section taken along line B-B in FIG. 2), and FIG. 2 is a cross-sectional view taken along line A-A in FIG. It is a front view.
3 is a plan view of a blank plate used in the composite container of FIG. 1, and FIG. 4 is a sectional view taken along the line C--C of FIG. 3. 5 is a front sectional view of another embodiment of the reduced pressure absorption plate 6 attached to the bottom piece 5 of FIG. 4.

In FIG. 1, the composite container of the present invention consists of a container body 1 and a lid 2. The container body 1 consists of the edges of the body piece 4 and the bottom piece 5 of the blank plate 3 and the reduced pressure absorption plate 6.
are joined by injection molding resin, and after cooling molding, the resin constitutes a lid receiving ring 7, a body piece joining rib 8, a joining ring 9 between the body piece and the bottom piece, and a lower ring 10, respectively. 3 and 4, a vacuum absorbing plate 6 having a bulging shape or a corrugated cross section is fitted into a bottom piece 5 formed by providing a concentric opening in the bottom plate of the blank plate 3 on the outside of the bottom of the container. Both are first
As shown in the figure, the outer peripheral edge of the reduced pressure absorption plate 6 is bonded to the upper surface of the bottom piece 5, and then attached to an injection mold. As shown in Figure 5, the vacuum absorption plate needs to have a shape that allows it to be sucked into the container and easily reversed when the pressure inside the container becomes reduced, and examples of this shape are shown in Figures A to D. .

The composite container of the present invention is characterized by a gas barrier vacuum absorbing plate 6 having a layered structure of metal foil as the bottom plate.
is fitted into the opening of the bottom piece 5, and the peripheral edge of the reduced pressure absorption plate 6 is completely covered with a resin bonding ring 9 formed at the same time as the injection molding.

Next, the materials of each member will be described.

Typical blank boards are PE (polyethylene)/paperboard/adhesive/aluminum foil/PE. There are also cases where aluminum foil is not used or paperboard is used. Also, PE can be replaced with other olefin resins. PE/aluminum foil/PE is good for the vacuum absorption board. It can also be made of steel foil.
PE may be other olefin resins. In the case of aluminum foil, the plate thickness is approximately 100μ or less (provided that the diameter of the vacuum absorption plate is 50mm). The injection molding resin may be any olefin resin, but PE is often used. During injection, the temperature of the resin is 200
℃, but inside the mold it is about 140℃.

Since the surfaces of both the blank plate and the vacuum absorption plate are coated with olefin resin, the surfaces that come into contact with the injection molding resin are completely bonded.

In the present invention, the vacuum absorbing plate 6 is attached to the bottom piece 5, which makes the structure of that part complicated, but there is no problem in terms of injection molding. The injection mold consists of a female mold that occupies the outside of the container and a male mold that is located inside the container. A common method is to attach the bottom piece of a blank plate to the tip of the male mold, and insert it into the female mold, or cover it with a split female mold. In the case of the present invention, as long as the reduced pressure absorption plate has a certain degree of rigidity, the shape of the tip of the male mold may be matched to the cross-sectional shape of the reduced pressure absorption plate, and the male die may be adsorbed to the tip portion as in the conventional method. In addition, if the strength of the vacuum absorption plate is weak, it is possible to attach and detach it from the male mold using the bottom piece around its periphery.

Although the drawings above have been explained using a cylindrical container, since the present invention is characterized by a vacuum absorption plate that also serves as a bottom plate, the shape of the container is not limited to this, and can be applied to conical and square containers, for example.

Effects of the invention The effects of the invention are listed below. With the above structure, (1) the vacuum absorption plate that includes a metal foil layer and is shaped to bulge outside the bottom of the container is fitted into the bottom piece as it is; There are no defects such as wrinkles, scratches, cracks, or pinholes due to the bending process of integral molding with the blank body, and the product has good leakage prevention and gas barrier properties.

(2) The peripheral edge of the vacuum absorption plate is covered with an injection-molded resin joining ring that joins the body blank and the bottom piece, which prevents corrosion of the metal foil of the vacuum absorption plate and prevents the liquid in the container from leaking. I don't have to worry about that at all.

In addition, a vacuum absorbing plate is provided at the bottom, making it possible to attach an easy-open mechanism to the lid.

[Brief explanation of the drawing]

Figure 1 is a front vertical sectional view of the composite container of the present invention (cross section taken along line B-B in Figure 2), and Figure 2 is A-A in Figure 1.
Linear cross-sectional view, Figure 3 is a plan view of the blank board, Figure 4 is a plan view of the blank board.
The figure is a sectional view taken along the line CC in FIG. 3, and FIG. 5 is another example of a front sectional view of the reduced pressure absorption plate. 1... Container body, 2... Lid, 3... Blank plate, 4... Body piece, 5... Bottom piece, 6... Decompression absorption plate, 7... Lid receiving ring, 8... Body piece joining rib,
9...Joining ring between body piece and bottom piece, 10...Lower ring.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A composite container made by supplying a blank plate formed by connecting a plurality of body pieces with a bottom plate to an injection mold and joining the edges of the blank plate with injection molding resin. In this step, the outer periphery of a vacuum absorbing plate made of a metal foil and an olefin resin laminated on both sides of the metal foil and the upper surface of the bottom piece are pasted and fitted into the opening of the bottom piece formed by opening the bottom plate of the blank plate. A composite container characterized in that the peripheral edge of the vacuum absorption plate, the body piece, and the bottom piece are covered with the injection molded resin. 2. The composite container according to claim 1, wherein the blank board is made of paperboard and aluminum foil, and polyethylene layers are laminated on both sides of the blank board. 3. The composite container according to claim 1, wherein the vacuum absorption plate is formed by laminating aluminum foil and polyethylene layers on both sides thereof.