JPS636009Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a container that is filled and sealed at high temperature to maintain sterilization in order to distribute wine, alcoholic beverages, etc. at room temperature.The bottom member is made of breathable plastic film. The double structure consists of an inner plate made of aluminum, and an outer plate that is gas impermeable (gas barrier) and is bonded around the inner plate to prevent deformation of the inner plate (inward the container) while maintaining gas barrier properties. This is characterized by the fact that the container body is prevented from being deformed due to the pressure difference between the inside and outside of the container after the contents have been cooled.

Conventionally, in this type of container, the top plate of the lid or bottom member has a concave or convex portion that deforms due to the pressure difference between the inside and outside of the container, or has a corrugated rib that can be expanded and contracted. It is used.
Furthermore, as a case where the lid or bottom member has a double structure, there is a structure as disclosed in Utility Model Publication No. 10263/1983, but the technology disclosed in the same issue has an outer lid a and a flexible structure. and an inner cover b are mounted facing each other with a predetermined space c between them, and the inner cover is deformed by the movement of air into and out of the space. However, in this case, since the inner cover is formed in a generally concave shape, a space corresponding to the height of the concave is created between it and the outer cover, and a space corresponding to the amount of deformation of the inner cover is created. Because there is a head space (space between the liquid content level and the top of the inner lid),
There are problems in terms of strength, and no consideration has been given to the strength of the sealing member.

The present invention has been conceived in view of the above points, and will be described in detail below based on embodiments shown in the drawings.

First, as shown in the cross-sectional view of FIG. 2, the body 1 of the container of the present invention is formed into a cylindrical shape by laminating a thermoplastic resin 3 such as polyethylene on the inner surface of a cardboard 2 with a thickness of about 60 μm, for example. A cover member 5 provided with an appropriate opening means 4 is fitted into one open end of the cylindrical body 1, and a bottom member 6 is fitted into the other open end. Here, to explain the bottom member 6 in more detail, the bottom member 6 is made of a relatively rigid outer plate 7 made of aluminum foil with a ventilation hole 8 provided approximately in the center. In other words, as shown in Figures 5 and 6,
Only the periphery of the outer panel 7 is attached to the inner panel 10 via adhesive 9.
It is characterized in that it is glued to the middle part 11, leaving a small space 12 (almost in close contact).

Here, to briefly explain the manufacturing process of the bottom member 6 of the present invention, as shown in FIG. Holes 8 are punched out at regular intervals using a die cutter A, and then a resin such as an ionomer with excellent adhesive properties such as Surlyn is pattern coated as an adhesive 9 using a pattern coating roll B as shown in the figure. Further, using a laminator C, a polyethylene film or the like that will become the inner plate 10 is bonded using only the adhesive 9, leaving a space 12. After that, holes 13 for counting, which is generally done, are punched with a register puncher D.
Finally, it is sufficient to punch out a desired shape and at the same time punch out a cross-sectional shape as shown in FIG.

Since the present invention is structured as described above,
Due to the pressure difference inside and outside the container that occurs when the liquid cools after being filled with high-temperature liquid and sealed with the bottom member 6,
Since only the inner plate 10 is made of a flexible, non-breathable plastic film, it deforms inwardly into a concave shape, thereby preventing deformation of the container body. Moreover, in the present invention, the pressure difference between the inside and outside of the container after the contents have been cooled is absorbed by the deformation of the bottom member, so there is no need to provide a large head space when filling the contents, unlike in the conventional case. Furthermore, the outer panel 7 and the inner panel 8 are closely bonded together using an adhesive with excellent adhesive properties such as ionomer, so the strength of the bottom member is superior to that of conventional containers of this type. .

Further, the manufacturing process is almost the same as that of a general lid, and can be easily and continuously carried out, resulting in excellent productivity as a container.

After filling and sealing the hole 8 of the outer panel 7, once it has cooled down, as shown in FIG. If you stick it on, you can maintain the gas barrier properties completely.

In addition, if polyethylene is used for the inner plate 10 of the bottom member of the present invention, the softening point of polyethylene is 70° to 70°.
Since it is 80℃, the inner plate 10 due to high temperature filling (about 90℃)
This has the effect of making it easier to deform because it becomes softer. Further, the contents can be sterilized by filling nitrogen gas through the holes 8 of the outer plate 7 when cooling the contents.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the prior art, Fig. 2 is a longitudinal sectional view of the present invention, Fig. 3 is an enlarged sectional view of the same main part, and Fig. 4 is an explanatory diagram showing the prior art.
The figure is a sectional view of the main part showing the state of use, Figure 5 is a plan view of the bottom member, Figure 6 is a sectional view taken along line X-X', and Figure 7 is a sectional view of the same bottom member.
The figure is an explanatory diagram showing the manufacturing process of the lid of the present invention. DESCRIPTION OF SYMBOLS 1... Body, 2... Cardboard, 3... Thermoplastic resin, 4... Opening means, 5... Lid material, 6... Bottom member, 7... Outer plate, 8... Hole, 9... Adhesion agent, 10
... Inner plate, 11 ... Middle part, 12 ... Space, 1
3...hole, 14...hotmelt, a...outer lid,
b...Inner lid, c...Space.

Claims (1)

[Scope of utility model registration request] For containers that are deformed by the pressure difference inside and outside the container that occurs after filling and sealing the contents, the bottom plate is made of a material that is relatively rigid and has excellent gas barrier properties, and the bottom plate is made of a material that is relatively rigid and has excellent gas barrier properties. A paper container for liquid, characterized in that it is formed by bonding only the periphery of an inner plate made of an air-impermeable film that can freely come into contact with and separate from an outer plate provided with holes and in close contact with the outer plate.