JPS59124207A - Method of sealing 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 method for sealing a container, in which a high temperature liquid is injected into the container through an opening, and then the opening is sealed with a lid.

Attempts have been made to use containers made of paper or a laminate of paper and synthetic resin in place of metal cans for supplying various liquid beverages. Disposable containers made of paper or a laminate of paper and synthetic resin are easy to dispose of after use, are lightweight, and are advantageous in terms of cost. . However, this type of disposable container has low rigidity, so if the opening is sealed with a lid after hot filling, the temperature of the liquid inside will drop and the water vapor will change to water, causing the inside to leak. pressure becomes lower than atmospheric pressure. As a result, the body of the container is deformed and a dent is formed. Such deformation of the container impairs its commercial value and makes it unsightly in appearance.

Various measures have been taken to prevent container deformation caused by negative pressure associated with such hot filling. That is, for example, ruled lines are pre-processed and provided on the cylindrical body of the container, and the ruled lines are used to induce regular deformation of the container. However, even in this case, the commercial value is lower than when the container is not deformed at all. Furthermore, the rigidity of the container is reduced due to deformation in the ruled line portion.

The present invention has been made in view of these problems, and it completely prevents deformation due to negative pressure generated inside the container after hot filling, and does not impair commercial value. Another object of the present invention is to provide a sealing method that does not reduce the rigidity of the container.

The present invention will be explained below with reference to examples. Figures 1 and 2
The figure shows a container according to a first embodiment of the present invention, and this container is composed of a body 1, a bottom plate 2, and a lid 3. As shown in FIG. 2, the body part 1 is composed of a laminate of an outer paperboard 4 and an inner synthetic resin film 5, and is formed into a cylindrical shape. The lower opening of this body 1 is closed by a bottom plate 2.

The bottom plate 2 is composed of a plate-like body with a laminate structure of paper and synthetic resin film or a laminate structure of paper and metal foil, and a ring-shaped joint 6 is bent downward on the outer periphery of the bottom plate 2. It is provided. The joint 6 is inserted into a groove 8 formed on the upper surface of the reinforcing ring 7 together with the lower end of the body 1, so that the bottom plate 2 is attached to the body 1.

A reinforcing ring 10 is attached to the edge of the opening 9 on the upper side of the body 1. That is, the groove 1 is formed on the lower surface of the reinforcing ring 10.
1 is formed, and the upper end of the body 1 is inserted into this groove 11. And on the top surface of the reinforcing ring 10,
A lid 13 is attached via a temporary sealing ring 12. The lid body 13 is made of a molded body of synthetic resin, and a flange 14 is formed on the outer circumferential side thereof. Further, the lid body 13 is provided with a pull tab 15 for opening. And from the base of this pull tab 15,
A cutting guide portion 16 extending in a substantially oval shape along the surface of the lid body 13 is formed by a V-groove. Therefore, by pulling the pull tab 15, the lid 13 is opened into an elliptical shape by the cutting guide section 16 consisting of a groove.

Next, a method of pouring a liquid beverage into the container according to this embodiment and sealing it with the lid 3 will be described.

First, the bottom is closed by attaching the body 1 to the bottom plate 2 via the reinforcing ring 7.Roughly, the reinforcing ring 10 is attached to the upper end of the body 1.In this way, the container is assembled. A liquid beverage is hot-filled into this container from the upper opening 9 in a high temperature state.The temperature of the liquid beverage at this time is, for example, 90°C.
This will sterilize the liquid beverage. Then, in a state where a predetermined amount of liquid beverage is poured into the container and some space is formed at the top of the container, the lid 3 is attached to the temporary sealing ring 12 (as shown in FIG. 3). Temporary sealing is performed, whereby the lid 3 closes the upper opening 9 of the container.

The temporary sealing ring 12 is made of, for example, foamable resin, and has a large number of pores formed therein, so that the temporary sealing ring 12 itself has air permeability. Moreover, at this stage of temporary sealing, ring 1
2 is not crushed, allowing air to pass through. Therefore, if negative pressure is generated inside the container due to a drop in the temperature of the liquid beverage filled inside the container or due to liquefaction of water vapor, the temporary sealing ring 12 will , as shown in Figure 3) at arrow 17.
As shown in the figure, air is introduced into the container. By introducing air into the container, the imbalance in pressure inside and outside the container is corrected. In addition, after this temporary sealing, ring 1 is inserted into the container.
Since the introduction of air through 2 takes place in a sterile atmosphere, it does not reduce the sterilization effect associated with hot filling. The introduction of air into the container through this ring 12 is caused by the temperature of the liquid beverage inside (below 60°C,
For example, the heating is continued until the temperature drops to 40 to 50°C. The liquid beverage may be cooled forcibly, or may be left to cool (1).

When the temperature of the liquid beverage inside drops below 40 to 50'C, the upper part of the lid 3 is further pressurized with a hot plate, thereby completely sealing the temporary sealing ring 12 as shown in FIG. flange 14 of this lid body 3.
is completely sealed to the upper surface of the reinforcing ring 10. When the lid body 3 is strongly pressed against the container side in this way, the pores of the sealing ring 12 made of foamed resin are completely crushed.
This prevents air from passing through, and the container is then completely sealed. After this, the temperature of the liquid beverage inside the container further decreases, but even if it falls further below the core temperature and reaches room temperature, the pressure drop inside the container that occurs at this time is very small, so the temperature of the liquid beverage inside the container decreases. For example, the trunk 1 will no longer be deformed.

As described above, in the container according to the embodiment, until the temperature of the liquid beverage inside drops to below, for example, 40 to 50°C, the temporary sealing ring 12 is attached as shown by the arrow 17 in FIG. Air is introduced into the container through the container, thereby preventing the generation of negative pressure inside the container, so that there will be no deformation due to dents or the like on the surface of the container after it is completely sealed. Therefore, the commercial value of the container will not be impaired. Furthermore, since the body portion 1 of the container properly maintains its cylindrical shape, its rigidity does not decrease.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In the following embodiments, parts corresponding to those in the first embodiment are given the same reference numerals, and descriptions of parts having the same structure will be omitted. In this second embodiment, as shown in FIG.
0 is formed in advance, and air is introduced from the gap between the lid body 3 and the reinforcing ring 10 at this bent portion 20. In other words, when temporarily sealing the lid 3, either lower the pressure applied to the lid 3, or do not apply pressure to the bent portion 20.
Leave 0 in the deformed state. After the temporary sealing, when the temperature of the liquid inside the container has decreased to 60° C. or less, for example 45° C., strong pressure is applied to the lid 3 and the bent portion 20 is deformed. As shown in FIG. 6, the flange 14 is completely joined to the reinforcing ring 10. Therefore, in this second embodiment as well, air is introduced through the gap between the bent portion 20 and the reinforcing ring 10 after the temporary sealing, thereby making it possible to prevent the container from deforming.

Next, a third embodiment of the present invention will be described with reference to FIG.

In this embodiment, the temporary sealing of the lid 3 to the ring 10 is performed using an adhesive 2 that is intermittently formed on the upper surface of the ring 10.
I try to do it by 1. That is, there is a portion on the upper surface of the reinforcing ring 10 to which no adhesive is applied, and in this portion, even if the lid body 3 is temporarily sealed, a gap will be created between the two. Therefore, air can be introduced through this gap, and negative pressure inside the container can be prevented. After temporarily sealing with adhesive 21,
Once cooled to a predetermined temperature, the lid 3 is completely sealed to the reinforcing ring 10 by the ζ heating plate.

Next, regarding the fourth embodiment of the present invention, FIGS.
This will be explained with reference to the diagram. In this embodiment, after injecting high-temperature liquid into the interior of the container, seven flanges 14 of the lid body 3 are heat-sealed to the surface of the reinforcing ring 10 by a hot plate 24,
This creates a temporary seal. Since the hot plate 24 has protrusions 25 intermittently formed on its lower surface, the flange 14 of the lid body 3 is sealed only at positions corresponding to the protrusions 25. 25, the flange 14 of the lid body 3
A gap is formed between the reinforcing ring 10 and the reinforcing ring 10 to allow air to pass therethrough. Therefore, it is possible to prevent the container from deforming due to the air passing through this gap. When the temperature of the liquid inside falls below a predetermined temperature, the flange 14 of the lid body 3 is completely sealed by another heating plate 26 whose lower side is flat, as shown in FIG. I have to. Therefore, this embodiment also provides the same effects as the above three embodiments.

As described above, the present invention temporarily seals the lid so that air can enter between the lid and the opening after high-temperature liquid is injected, and the temperature of the liquid is cooled to 60°C or less. The present invention relates to a container sealing method that completely seals a lid in a state in which the lid is completely sealed.

Therefore, the pressure difference between the inside and outside of the container is corrected by the intrusion of air after the temporary sealing, so that negative pressure is no longer generated inside the container. Therefore, by preventing deformation of the container, it is possible to prevent a decrease in its commercial value.

Furthermore, since there is no need to pre-form a line to induce deformation in the container, the rigidity of the container does not decrease.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a container according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the same, FIG. The figure is an enlarged cross-sectional view of the main part in a completely sealed state, FIG. 5 is a front view of the main part in a temporarily sealed state of a container according to the second embodiment of the present invention, and FIG. 6 is a completely sealed state. 7 is an exploded perspective view of the upper part of the container according to the third embodiment of the present invention, and FIG. 8 shows the state of the temporary seal of the container according to the fourth embodiment of the present invention. FIG. 9 is a front view of the main part showing a completely sealed state. In addition, in the symbols used in the drawings, 1... Chest 3... Lid body 9... Opening 10... Reinforcement ring 12... Temporary. Seal ring 14... Flange 17... Air flow 20... Bent portion 21... Adhesive 24, 26... Hot plate 25... ...It is a convex part. Agent Osamu Matsumura Figure 2 Figure 3 Figure I4 Figure 5 Figure 4 Figure 6

Claims (1)

[Claims] In a method of injecting high-temperature liquid into a container through an opening and then sealing the opening with a lid, a temporary seal is provided to allow air to enter between the lid and the opening after the high-temperature liquid is injected. . A method for sealing a container, characterized in that the lid is completely sealed while the liquid is cooled to a temperature of 60° C. or less.