JPS6112802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sealed container used for heating and sterilizing filling liquid or viscous contents, for example.

Conventionally, when filling containers with contents with high acidity or sugar content, in order to sterilize the contents and containers,
After heating and filling, the container is sealed to prevent sterilization and contamination of bacteria within the container, thereby obtaining a sealed container.

However, in order to prevent bacteria from entering the container, it is necessary to seal the container immediately after heating and filling. As a result, as the container cools after being sealed, the contents and the air inside the container contract, causing the container to leak. There were cases where the inside of the container became depressurized, causing deformation of the container. In particular, containers made mainly of paper sometimes impair their commercial value due to their appearance.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a method for manufacturing a sealed container that can prevent deformation of the container without increasing the strength of the container and can be stored for a long period of time. That is.

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

FIGS. 1 and 2 are a sectional view and a bottom view showing an embodiment of the lid used in the present invention. First, the lid will be described. 1 is the lid, and 2 is a filter. 1a is a flange integrally molded on the upper edge of the lid body 1, 1c is a bottom wall, 1b
This is a ventilation hole formed in the In this example, a raw fabric made of 50 μm of Al (aluminum)/40 μm of PE (polyethylene) is press-molded, a ventilation hole 1c is formed to form the lid body 1, and the filter 2 is made of, for example, Tyvek 1073B ( Ventilation hole 1 using special PE sheet like (registered trademark) as a filter
It was heat-sealed to the bottom surface of the bottom wall of the lid main body 1 so as to close the cap.

According to the present invention, a sealed container is manufactured using the lid manufactured as described above.

That is, the present invention will be explained with reference to FIG. 3. For example, PE60μ/Al 9μ/paper 280g/m ² /
A container body 3 made of laminated paper of PE 20μ is filled with heated contents 4, and then the flange 3a of the container body 3 and the flange 1a of the lid body 1 are heat-sealed to manufacture the container. Even if the contents 4 are cooled and contracted by going through the cooling process after filling and sealing, and the air inside the container also contracts, the air from which bacteria has been filtered through the filter 2 from the ventilation hole 1c of the lid remains inside the container. Since the liquid flows into the container, the container will not be deformed, and there is no need to worry about the contents spoiling.

The filter 2 is not limited to a special PE sheet filter, but may also be a microporous film made of polypropylene, or sterile paper used for medical sterilization bags and the like. However, the commonly used sterilized paper is a mixture of resin fibers and pulp and has poor water resistance, so it is best to coat it with silicone before use.

The present invention proposes a method for manufacturing a sealed container that further seals a barrier film in the sealed container manufactured as described above.

That is, as shown in FIG. 4, in the present invention, after filling the container body 3 with heated contents 4, the container body 3 is sealed with a flat lid 1', and then, after cooling, the entire surface of the lid 1' is sealed. Alternatively, as shown in FIG. 5, the barrier film 5' is sealed only to the vent hole 1c.

In FIG. 4, the lid 1' is an inexpensive film-like material with low barrier properties, such as polyethylene alone or a laminate of PE/CPP (unoriented polypropylene). The barrier film 5 is, for example, a laminate of PET 12μ (polyethylene teresterate resin film)/Al 9μ/HS agent (heat sealing agent) or PET/PVDC (polyvinylidene chloride)/PE.

In FIG. 5, the lid 1 is the same as that in FIG. 3, and the barrier film 5' is made of Al 20μ/
It is an adhesive or a laminate of PET 12μ/Al 9μ/adhesive.

Note that the lid body may be flat-shaped or a drop-shaped lid.

Furthermore, in the present invention, as shown in FIG. 6, after filling the container body 3 with the contents 4, the container body 3 is sealed with a filter 2, and after cooling, a barrier film 5'' is sealed over the entire surface of the filter 2. A manufacturing method is also proposed. This barrier film 5'' is, for example, a laminate of PET 12μ/Al 9μ/PE40μ.

In this case, there is no need to form ventilation holes in the lid body in advance.

In any case, the present invention is characterized in that deformation of the container can be prevented without increasing the strength of the container, and a sealed container that can be stored for a long period of time can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the lid used in the present invention;
FIG. 2 is a top and bottom view of the same, FIG. 3 is a cross-sectional view of a sealed container obtained by the manufacturing process of the present invention, and FIGS. 4 to 6 are cross-sectional views of a sealed container obtained by the manufacturing method of the present invention. be. 1...Lid body, 2...Filter, 3...Container body, 4...Contents, 5...Barrier film.

Claims (1)

[Claims] 1. After filling the heated contents into the container body, a vent hole is closed with a filter, which is a lid made separately from the container body and which allows gases to pass through but not bacteria to pass through. After the lid is welded to the container body and the container and its contents are cooled, at least the ventilation hole of the lid is provided with a barrier property to prevent air from entering the container. 1. A method for manufacturing a sealed container, comprising: sealing a film containing a film. 2. After filling the heated contents into the container body, it is sealed with a filter that allows gas to pass through but does not allow bacteria to pass through, and then after cooling the container and the contents, a film having barrier properties is sealed over the entire surface of the filter. A method for manufacturing a sealed container.