JPS6341330Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an airtight container in which the pot-shaped container body is made of a molded resin sheet with high barrier properties, an inner container is built into the container body, and a metal top lid is wrapped around the container body. be.

For airtight containers for long-term storage of dried foods, a method is used to replace the inside of the container with gas.
In order to maintain this effect, the container must have barrier properties. A metal can is suitable for meeting this requirement, but if it is made of metal, it is difficult to form the container body into a tapered cup shape that can be overlapped for convenience in transportation and storage. Have difficulty. Therefore, vacuum-formed resin sheets with high barrier properties into a tapered tap shape are extremely advantageous in terms of cost, and have recently come to be used as container bodies. However, the top lid that fits onto the container body needs to have a fully open structure so that it can be easily opened completely, so a metal plate such as a tin plate is used.

However, in this type of container, the peripheral edge of the top lid is wrapped around the upper end of the container body, and since the container body is made of a soft resin sheet molded product as described above, the container body is wrapped around the upper end of the container body during the wrapping process. There was a problem in that the peripheral wall could not withstand pressure and buckled inward.

Furthermore, due to the need for long-term preservation of food products, when gas is replaced, the container body swells due to the increase in internal pressure, and this bulge phenomenon is particularly likely to occur on the bottom wall due to the cup shape of the container. In many other containers, ribs are formed to prevent the bottom wall from bulging, but in this type of container made of a resin sheet, even if ribs are formed on the bottom wall, a sufficient effect cannot be obtained. In addition, the pressure inside the container may be reduced to remove oxygen, but this type of container also deformed during this process.

This idea solves the above-mentioned drawbacks, and aims to make the container body able to withstand the pressing force when the top lid is tightened and fitted, as well as the increase or decrease in internal pressure caused by gas replacement or depressurization. .

That is, the present invention provides an airtight container in which the top-shaped container body is made of a resin sheet molded product with high barrier properties, and a metal top lid is tightly wound and fitted onto the container body, and a synthetic resin material is used as a reinforcing material inside the container body. By fitting the inner container, the inner container is constructed so that it can withstand the pressing force when the top lid is tightened, and the bottom wall of the container body is bonded to the bottom of the inner container, so that the inner container can withstand the pressure increase or decrease in internal pressure. It is characterized by preventing the bottom surface of the container body from deforming.

Next, embodiments of the present invention will be described in detail based on the drawings. 1 and 2 are a perspective view and a vertical sectional view showing the sealed container according to an embodiment of the present invention separated into parts before assembly, and FIG. 3 is a vertical sectional view in the assembled state.

As shown in the figure, the airtight container of this invention consists of a container body A, a top lid B, and an inner container C. A multilayer sheet is formed into a pot shape by vacuum forming, a flange piece 1 is provided at the upper end for tightening the upper lid B, and a low and wide raised part 2a is formed in the center of the bottom wall 2 to increase the height difference. Thread bottom 2 on the periphery
b is provided.

The upper lid B is press-molded from tinplate, and has a bent piece 3 for tightening around the periphery. Further, as a fully open structure, an annular cutout groove 4 is provided around the entire circumference, a bending groove 5 is provided at one end inside the groove 4, and a knob 6 is attached near the bending groove 5. When lifted, the bending groove 5 bends, so that one end of the cutout groove 4 opens.

The inner container C is made of a hard or semi-rigid synthetic resin such as an injection molded product or a styrofoam molded product, and is formed into a concentric cup shape that fits snugly into the inner diameter of the container body A. In particular, when the inner container C is fitted into the container body A, the upper edge of the inner container C is formed at a height that is approximately flush with the upper edge of the container body A, that is, the height is such that it comes into contact with the top lid B, and At the bottom, there is a raised part 2a of the container body A in the center of the lower surface of the bottom.
A recessed part 7 into which the thread bottom 2b is fitted is provided at the peripheral edge.
A reinforcing portion 8 is formed.

When assembling this, the middle container C is fitted into the container main body A, and the middle container C is adhered to the upper surface of the raised portion 2 of the container main body A. In this case, it is preferable to fuse. Next, put the top lid B on the container body A, and
Wrap the bent piece 3 of the top cover B around the flange piece 1. .
In this case, although a pressing force is applied from above to the container main body A, the pressing force is also received by the inner container C, so that the peripheral wall of the container main body A does not buckle. Also, when replacing the gas next time, use the middle container C.
Although the pressure between the container body A and the container body A also increases, there is no fear that the bottom wall 2 of the container body A will bulge out because the bottom wall 2 of the container body A is bonded to the bottom surface of the medium container. Moreover, it does not deform even under reduced pressure.

Note that it is preferable that the adhesive portion 9 between the bottom wall 2 of the container body A and the bottom surface of the inner container C be provided at least in the center, and if provided in a scattered manner, bulging can be further prevented.

As explained above, this invention is a sealed container in which the top-shaped container body is made of a resin sheet molded product with high barrier properties, and a metal top lid is tightly wrapped around the container body. In addition to fitting the inner container made of synthetic resin as a material, the bottom wall of the container body is glued to the bottom of the inner container, so that the inner container can receive the pressing force when the top lid is tightened. This prevents the container body from buckling when the top lid is tightened, and provides a good sealing condition for the container. Furthermore, the container main body is prevented from bulging due to an increase in internal pressure when gas is replaced, or is prevented from being deformed when the pressure is reduced, and an airtight container with a good appearance can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIGS. 1 and 2 are perspective views and vertical cross-sectional views showing the sealed container before assembly, separated into parts, and FIG. 3 shows the sealed container in the assembled state. FIG. A...Container body, B...Top lid, C...Middle container,
1... Flange piece for tightening the container body, 2... Bottom wall,
3...Folded piece for tightening, 9...Adhesive part.

Claims (1)

[Scope of utility model registration request] In an airtight container in which the cup-shaped container body is a resin sheet molded product with high barrier properties made by laminating multiple layers of resin films, and a metal top lid is tightly wrapped and fitted to the container body, there is a reinforcing material inside the container body. By fitting an inner container made of hard or semi-hard synthetic resin formed at a height that contacts the upper lid, the inner container is configured to withstand the pressing force when the upper lid is tightened. A closed container characterized in that the bottom wall of the container body is adhered to the bottom surface of the container to prevent the bottom surface of the container body from deforming due to an increase in internal pressure or a decrease in internal pressure.