JPH1035732A - Airtight foam container fitted with lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a lid to a container so that soup does not overflow the periphery of the container after closing. SOLUTION: An airtight foam container fitted with a lid consists of a container made of synthetic resin foam having an inverted. inclined surface 3a becoming a small diameter upwardly formed to the mouth part inner peripheral surface 3 thereof, an inner lid B formed by vacuum molding of a hard synthetic resin sheet and having an inverted inclined surface 7a closely fitted to the inverted inclined surface 3a formed to the fitting peripheral wall 7 between a shallow bottom lid surface wall and an engaging flange 9 and the outer lid C pressing the inner lid. The mouth flange 1 curved so as to continue to the upper end of a mouth part inner peripheral surface is provided to the container A and an annular protruding part 11 is provided to the shallow bottom lid surface wall 5 of the inner lid B along the fitting peripheral wall 7 and some projections 17 hooking with the mouth flange of the container are provided to the outer lid C formed into an inverted tray shape from a hard synthetic resin sheet so as to press the inner lid to the peripheral edge of the container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed foamed container with a lid, the container being made of foam and used mainly for storing food.

[0002]

2. Description of the Related Art Styrofoam containers and the like are lightweight and have excellent heat insulating properties, and are therefore frequently used as packaging containers for various foods and as containers that serve as both packaging and tableware. Conventionally, as a lid to be placed on such a foam container, a foam lid, a peeling lid made of a heat-welding sheet, and a vacuum-molded lid made of a hard resin sheet have been used.

[0003] In the case of a foam lid, a box-shaped container used for means for direct delivery from the production area can be mentioned. In this case, the container and the lid are put together by a simple step-to-step alignment. You. Further, in the case of a peeling lid, for example, it is found in a container such as instant noodles, and the sheet is bonded by heat welding. In the case of a vacuum-formed lid, a flange is formed around the container, and a cover is provided on the lid to cover the flange, and a projection is formed on the cover at the same time as the vacuum forming.

[0004]

All of the conventional foam containers with a lid as described above have a problem in the sealing property as a function of preventing juice leakage after opening. In other words, when the lid is a foam together with the container, an adhesive tape is stuck around the place where the lid is fitted to ensure sealing during transportation,
When peeled off, the sealing property is lost, and when it is tilted, water inside leaks. In addition, if the cover is a peeling lid, if the heat-sealed seal is peeled, the consumer cannot heat-weld again.

[0005] In the case of a vacuum-formed lid, airtightness for preventing oxidation is secured by separately wrapping the whole film in the distribution process, but when the lid is opened, the lid has no sealing property. If, for example, heated in a microwave oven with water or hot water and then re-covered, such as soup flour instant food, when putting in and out of the microwave oven, or during transportation, the container There was an inconvenience that juice overflowed from the surroundings when tilted.

As a means for preventing the juice from overflowing from the surroundings, as shown in, for example, a lunch box in which both the container and the lid are made of plastic by injection molding, a reverse seal is provided around the lid on both the inner and outer surfaces of the upper end of the container. It is conceivable to provide a channel-shaped annular seal. However, if the container is fragile, such as a foam, such measures cannot be taken because the edge of the container will be torn off at the inverted channel when the lid is removed.

The present invention has been made in view of the above-described circumstances,
An object of the present invention is to provide an airtight foamed container with a lid that can be covered with a lid so that juice does not overflow from the periphery of the container even after opening, and that the opening of the container made of a fragile foam material is not broken by the lid. And

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a synthetic resin foam container having a small-diameter inverted inclined surface formed on an inner peripheral surface of a mouth, and an elastically deformable container. Vacuum forming of a hard synthetic resin sheet in which a similar reverse inclined surface closely fitted to the reverse inclined surface is formed on a fitting peripheral wall between a shallow bottom lid surface wall and a hook flange so as to be fitted together. And an outer lid for holding down the inner lid to form an airtight foam container with a lid.

The container is provided with a mouth flange which curves continuously with the upper end of the inner peripheral surface of the mouth, an annular convex portion is provided on the shallow bottom cover surface wall of the inner lid along the fitting peripheral wall, and the rigid synthetic resin sheet is used to reverse the shape. It is particularly effective to achieve the object if the outer lid formed in the shape of a tray is provided with several projections which hang on the brim of the container on the periphery to hold down the inner lid.

[0010]

[Function] Since the airtight foam container with the lid is configured as described above, when the inner lid is pressed against the container when the lid is closed, elastic deformation occurs in the container and the inner lid, and the inner peripheral surface of the mouth of the container expands. As a result, a state of fitting with both reversely inclined surfaces is obtained. Therefore, even if there is no pressing by the outer lid when the container is tilted, the state where the inner lid is stably fitted is maintained.

When the container is tilted, even if a force is applied to the inner lid by the pressure of the contents to act on the inner lid, the inner lid is prevented from being disengaged by being caught by the reversely inclined surfaces, and the reversely inclined surfaces are prevented from being separated from each other. In order to further improve the close contact state, the juice never leaks unless the inner lid is removed. In addition, the outer lid not only plays a role of ensuring safety so that the inner lid does not come off even when an impact is applied, and also enhances the function of preventing the inner lid from leaking as described later.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings.

The drawing is an embodiment of an airtight foamed container with a lid for instant food such as soup powder to be heated and eaten in a microwave oven. The container A is made of styrofoam and a transparent hard synthetic resin sheet. Inner lid B formed by vacuum
And an outer lid C.

The container A has a circular bowl shape, and has a flange 1 which is curved outward and turns over at the upper end, and the peripheral side wall 2 is inclined upward and downward. It is inclined in reverse. That is, the mouth inner peripheral surface 3 is formed with an inverted inclined surface 3a that is refracted with respect to the inner surface of the peripheral side wall 2, and the refraction is inclined inward by an angle α with respect to the vertical line P. Further, the mouth inner peripheral surface 3 is formed on a curved surface 3b that is continuous with the curved surface of the mouth flange 1 while gradually opening at the upper end so that the inner lid B can be easily fitted. Therefore, the fitting of the inner lid B is guided by the curved surface 3b so as not to be caught.

The inner lid B has a circular shape having a circular shape large enough to cover the lip 1 of the container A with the latching flange 9 at the periphery thereof, and has a shallow bottom-shaped lid surface wall 5 which falls so as to fit inside the opening of the container A. The fitting peripheral wall 7 rises between the hooking flange 9 and the fitting peripheral wall 7 is curved so as to be in close contact with the mouth inner peripheral surface 3 of the container A, and is inclined at an angle β with respect to the vertical line P at the lower end. It is formed on the reverse inclined surface 7a. Note that the angles α and β are almost the same.

When the inner lid B is pushed into the inner peripheral surface 3 of the mouth of the container A, elastic deformation mainly occurs in the inner lid B, and the inner peripheral surface 3 of the opening is pushed and opened to fit the inner lid B. . In this state, since the inverted inclined surfaces 3a and 7a are caught by each other, the inner lid B does not come off accidentally.

When the container A is tilted as shown in FIG. 2, the pressure of the contents W is applied to the end of the inner lid B in the direction of inclination. At the end, the rotational force is centered on the point Q pressed by the outer lid C, and since it is the force in the arc direction M intersecting with the reverse inclined surface 3a, the reverse inclined surfaces 3a and 7b are in close contact with each other. In order to further increase the content, the function of preventing the contents W from leaking itself is also enhanced by the outer lid C.

The shallow bottom lid surface wall 5 has an annular convex portion 11 protruding in a mountain shape in a circle centered on the circular center of the inner lid B.
Are formed. Of course, this will be a rib,
The fitting peripheral wall 7 evenly applies a repulsive force of pressing against the inner peripheral surface 3 of the mouth of the container A. In addition, when the container A is tilted as shown in FIG. 2, the pressure of the content W applied to the inside of the annular convex portion 11 acts in a direction of pressing the fitting peripheral wall 7 against the inner peripheral surface 3 of the opening of the container A. At the same time, the inner lid B is prevented from coming off, and at the same time, the leakage of the juice is further strongly prevented by the improvement in the adhesion between the inverted inclined surfaces 3a and 7a. A vent 13 is formed at the center of the shallow lid surface wall 5 by a cut groove for drawing out a tongue for releasing steam.

The outer lid C is placed on top of the inner lid B,
Are formed on the peripheral edge wall 15, and several linear projections 17, 17,... Then, during heating in the microwave oven, steam from the vent 13 is discharged from around the outer lid C. Moreover, even if the juice is blown out from the vent 13, it is collected inside the annular convex portion 11 on the shallow bottom lid surface wall 5 of the inner lid B, and returns to the container A from the vent 13 when the boiling stops.

[0020]

As described above, according to the airtight foam container with a lid of the present invention, the lid can be attached so that the juice does not overflow from the periphery of the container even after the container is opened. Because of the fitting between the reversely inclined surfaces, the height is further increased when a force is applied in a direction in which the inner lid comes off. Moreover,
When the container is tilted, the outer lid not only stops the inner lid but also further enhances the ability of the inner lid to prevent juice leakage, so that it is exactly the most suitable as a packaging container for foods with high moisture and juice. In particular, as a container for ready-to-eat foods that are heated and eaten in a microwave oven,
Alternatively, when used as a container for a lunch box, juice leakage never occurs, which is extremely convenient. In addition, since the inner lid is fitted with an inverted slope mainly by delicately utilizing the elastic deformation of the foam of the container, the mouth of the fragile container is not broken by opening the lid, and the juice is maintained even after opening. There is an excellent effect that the function of preventing leakage can be reliably maintained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an airtight foam container with a lid according to the present invention, which is partially cut away.

FIG. 2 is a cross-sectional view of the airtight foamed container with the lid in a tilted state for preventing leakage of juice.

[Explanation of symbols]

 Reference Signs List A container B inner lid C outer lid 1 mouth flange 3 mouth inner peripheral surface 3a reverse inclined surface 5 shallow bottom lid surface wall 7 fitting peripheral wall 7a reverse inclined surface 9 hooking flange 11 annular convex portion 17 projection

Claims (2)

[Claims] 1. A container A made of a synthetic resin foam having a reversely inclined surface 3a having a small diameter upward formed on an inner peripheral surface 3 of a mouth, and a shallow bottom lid surface wall 5 fitted into the container A with elastic deformation. The inner cover B formed by vacuum molding of a hard synthetic resin sheet having a similar reverse inclined surface 7a tightly fitted to the reverse inclined surface 3a formed on the fitting peripheral wall 7 between An airtight foam container with a lid, comprising an outer lid C for holding down. 2. A container A is provided with a brim 1 which curves continuously with the upper end of the inner circumferential surface of the mouth, and an annular convex portion 11 is formed along a fitting circumferential wall 7 on a shallow bottom cover surface wall 5 of the inner cover B. The outer lid C formed of a rigid synthetic resin sheet in the shape of an inverted tray is provided with a number of projections 17 that hang over the brim of the container on the periphery to hold down the inner lid. Item 7. An airtight foamed container with a lid according to Item 1.