JPS62122962A - Sealed vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a sealed container.

Sealed containers made of rigid materials such as glass containers (hereinafter referred to as glass containers) are conventionally sealed with a screwdriver yappu or a twisted gyu yappu, and then sterilized with boiling water at 90°C or higher or 110'C-120°C. It is used for retort sterilization at temperatures around ℃. In general, screw screws are relatively easy to loosen, but are somewhat difficult to open, while twisters are relatively easy to open, but loosen easily. However, the common thing in all cases is that (a) the seal is achieved by the mechanical force of tightening the lid fittings, so the beef yap may come loose during the sterilization process under heat.・・During transportation, the corner of the beef yap hits something, deforming the beef yap, and creating a gap between the beef yap and the glass container. 09 As a result of (a) and 0 above, the glass container There are problems in that the sealing condition of the container is impaired and the contents often become moldy, deteriorated or putrid. Some of these problems can be alleviated by increasing the tightening torque of the lid, but in this case it is unavoidable that it becomes extremely difficult to open the lid.

Recently, a method has been developed in which a lidding material in which a thermoplastic resin layer is formed on one side of an Alum foil laminate is thermocompression bonded to the opening of a glass container to seal the container. In sealed containers obtained by this method, problems such as deterioration and leakage of contents due to contact or collision during transportation and damage to seps, difficulty in opening, etc., are largely solved, but heat sterilization New obstacles are emerging in the process. That is, for example, 3 at 120°C
When retort sterilization for 0 minutes is at risk, a large difference occurs between the temperature inside the retort pot and the temperature of the contents inside the glass container during the temperature raising and cooling steps because the glass container has a large heat capacity. This temperature difference then creates a pressure difference between the internal pressure and external pressure of the glass container. In the case of a sealed body made of a rigid material, it deforms freely and absorbs this pressure difference, so it will not break, but in the case of a container made of a rigid material such as a crow container, the lid material Since all the force is applied to the thermocompression bonded portion, the lid material may be torn or the thermocompression bonded portion may peel off. These problems can theoretically be solved by adjusting the pressure inside the retort pot. However, the above pressure difference varies depending on the size of the glass container, the amount and type of contents, etc., so each company or two or more types of sealed containers with different contents must be controlled to prevent damage or peeling. However, it is difficult to simultaneously process the same contents at the same time, and in the end, it becomes necessary for the same company to perform retort sterilization for each sealed container containing the same contents.

As a result of extensive research in view of the problems of the prior art as described above, the inventor of the present invention has found that the problems can be almost solved if the lid has a two-way structure and a sealed space is formed between them. I found it. That is, the present invention provides the following sealed container.

■ In a sealed container made of a rigid material that has been filled with contents and sterilized by heating, the opening is sealed with an inner lid made of a flexible material and an outer lid made of a rigid material, and the inner lid and outer lid are sealed. A sealed container characterized in that a sealed space is formed between the containers.

The present invention will be specifically described below with reference to the drawings.

In FIG. 1, a container (1) made of a rigid material such as a crow container or a ceramic container is filled with contents (6), and the inner M
(2) and an outer lid (3) close the opening, and a sealed space (4) is formed between them.

The inner lid (2) is made of metal foil such as aluminum foil, plastic film, plastic film and aluminum fi
Containers (from flexible materials such as composite materials with
1) The end face of the opening is completely sealed. Outer lid (3
) are made of rigid materials such as maple, plastic, glass, etc., and are attached with screws and screws or twist screws.

A sealed space provided between the inner lid (2) and the outer lid (3) (
In order to maintain a highly sealed state in step 4), it is preferable to place a loose lid (5) made of heat-resistant silicone rubber or the like between the inner lids. This rosette (5) also helps prevent the heat-sealed portion of the inner lid (2) from peeling off.

When a sealed container in the state shown in Figure 1 is subjected to boiling water sterilization at 90°C or higher or retort sterilization at about 110 to 120°C, the air layer existing in the closed space (4) expands and contracts. As a result, the internal pressure of the air layer and the internal pressure within the glass container are relatively easily balanced, so no particularly large force is applied to the inner lid (2) and its heat-sealed portion, and the seal is therefore unlikely to be broken. do not have.

Figure 2 shows the inner lid (2) with the central part (7) protruding downward.
shows. In this case, the sealed space (4) can be made much larger than the sealed container shown in FIG.
It can withstand large pressure fluctuations.

According to the present invention, the following effects are achieved.

(-) Counter pressure? - Even in hot water sterilization without applying heat and boil sterilization, the seal will not be broken due to damage to the lid material.

(ii) During retort sterilization by applying counter pressure, the process can be carried out without breaking the seal even if the internal and external pressures of the glass container are not precisely controlled.

Examples will be shown below to further clarify the characteristics of the present invention.

Example 1 A glass container coated with modified polyolefin to a thickness of 1 μm on the upper end surface of the opening was filled with mushrooms boiled in mouth oil at 60°C.
Printing layer 150μm aluminum foil/Adhesive layer/Ima Ott
Using a lid material consisting of a layer of m-modified polyolefin, 20
The glass container was heat-sealed under the conditions of 0°C A sealed container with a space was obtained.

The resulting sealed container was sterilized by torturing at 1+6°C for 21 minutes (9/cd> at a counter pressure of 0.8, then
Hold at 90°Q for 12 minutes, hold at 70°C for 12 minutes, 4
0°QX I Cooled in 3 stages under the condition of holding for 2 minutes9.

Among the 300 bottles that were sterilized and cooled, there were no seals that were defective.

Example 2 A glass container similar to that used in Example 1 was filled with boiled kelp at room temperature, and then sealed with an inner lid and an outer lid in the same manner as in Example 1. Next,! It was heated with steam at 00''C for 0 minutes and allowed to cool.

No abnormalities were observed in all 200 bottles that were sterilized and allowed to cool.

[Brief explanation of drawings]

FIG. 1 is a longitudinal RFI diagram showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a modified example of the inner lid. (1)...1411 $4 container, (2)...inner lid, (3)...outer lid, (4)...closed space, (5)
... Packing, (6) ... Contents, (7) ...
A downwardly protruding central portion of the inner lid (2). (Above) Agent: Hide Saegusa, Patent Attorney Figure 1 Figure 2

Claims (1)

[Claims] (1) In a sealed container made of a rigid material that has been filled with contents and heat sterilized, the opening is sealed with an inner lid made of a flexible material and an outer lid made of a rigid material, and the inner lid and outer lid are sealed. A sealed container characterized by having a sealed space formed therebetween.