JP4384760B2 - Container outer lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outer lid used for a food container that is cooked in a microwave oven.
[0002]
[Prior art]
Conventionally, food containers that are cooked in a microwave oven have an inner lid sealed on the upper surface of the container body and covered with an outer lid. Although it is in this state in the distribution channel, contents stored in containers at convenience stores and homes, for example, food such as soup, are used in commercial microwave ovens (1500 to 1600 W / 50 seconds) or household microwave ovens (500 to 600 W / 50%). When heating in 3 minutes), remove the inner lid and cover with the outer lid again. When heated with the inner lid attached, the contents boil, the inner lid ruptures due to the increase in pressure in the container and the expansion air pressure, and the outer lid and contents scatter into the range. Even if it is placed in a microwave oven without a lid, the contents boil and scatter in the microwave oven, which is not preferable as a cooking method (heating means).
[0003]
[Problems to be solved by the invention]
Therefore, as a solution, a vapor hole is provided in the outer lid, a hole is formed in the upper surface (top plate), or a cross is cut in the cross.
However, if a steam hole is provided in the outer lid, or a hole is made, and a cross is cut, there is a risk of contamination of foreign objects and accessories such as a spoon due to electrostatic pollution at the distribution stage, which is not preferable in handling food. In addition, there is a problem that additional work such as drilling and cutting is required, leading to an increase in cost. In addition, PE shrink or the like may be applied to the outer packaging, which also increases the cost.
[0004]
[Means for Solving the Problems]
The present invention has been made to solve such a problem, and the means is formed so as to hang down from the outer periphery of the flat plate portion that abuts against the opening flange of the container main body. An outer lid of a container including a skirt portion, a side wall provided inside the flat plate portion, and a canopy plate connected to the side wall, wherein the skirt portion includes an outer peripheral edge of the opening flange and the skirt portion. The skirt portion is protruded outward so as to be continuous in the hang-down direction of the skirt portion so as to be able to reciprocate in the drooping direction, and serves as an air escape groove when the internal pressure of the container body increases. A step groove formed continuously with the flat plate portion, and abuts the opening flange when the internal pressure of the container body drops, and closes the convex groove; and the opening flange with a predetermined interval from the flat plate portion. Projecting inward so as to face And a stopper rib that suppresses the movement of the outer lid when the internal pressure of the container body rises, and the outer lid is pushed up as the internal pressure of the container body rises, thereby separating the stepped portion from the opening flange. The protrusion groove is opened and the stopper rib is arranged to be hooked on the opening flange.
[0005]
[Action]
When cooking the contents stored in the container body, if the inner lid is removed and the outer lid is put on, the flat plate portion of the outer lid abuts the upper surface of the opening flange of the container body, and the skirt portion is in close contact with the outer periphery of the flange In this state, there is no risk of the contents leaking even if there is no inner lid. If heated in a microwave oven in this state, the temperature in the container body rises, steam is generated, the internal pressure rises, and the flange abuts against the stopper rib by the expansion air pressure. However, the water vapor is removed from the protruding grooves formed in the skirt portion, the internal pressure is not increased, and the outer lid is not removed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described with reference to the drawings. A container is composed of an outer lid A, a container main body B for storing (filling) the contents, and an inner lid C serving as a top seal material of the main body. A resin sheet such as PP (polypropylene), PE (polyethylene), PET (polyester), PS (polystyrene) or the like is formed by vacuum molding or injection molding, and the shape of the container body B Correspondingly, it is formed into an arbitrary shape such as a circle, an ellipse, a square, a rectangle, or a polygon.
[0007]
The outer lid A is connected to the flat plate portion 1 that is in contact with the upper surface of the opening flange b of the container body B, the skirt portion 2 that is in close contact with the outer periphery of the flange b, the side wall 3 provided on the inner upper portion of the flat plate portion 1, and the side wall 3. When the outer lid A is put on the container main body B, the flat plate portion 1 is arranged to face the upper surface of the opening flange b and is in a closed state.
[0008]
The skirt portion 2 is suspended from the lower outer periphery of the flat plate portion 1, and a plurality of protruding groove 5 is formed on the outer peripheral surface of the skirt portion 2 from the upper end to the lower end. The groove inner space of the protruding groove 5 is the outer periphery of the flange b. It does not abut and functions as an air (steam) escape groove, and a plurality of stopper ribs 6 are formed at the lower part of the inner surface to serve as a stopper when the outer lid is pushed up. Further, on the inner surface of the skirt portion 2, a temporary fixing projection 7 is provided on the back side of the flat plate portion 1 in order to prevent rattling of the outer lid during normal time and reduced pressure, and corresponds to the thickness of the flange b of the container body B. However, when the outer lid is pushed up due to an increase in internal pressure during heating, the outer lid is lifted over the temporary fixing projection 7 and is hooked on the stopper rib 6. .
[0009]
The ridge groove 5 is formed so as to protrude from the outer surface of the skirt portion 2, the upper end thereof is connected to the flat plate portion 1 to form a step portion, and the lower portion is formed to have a larger diameter than the outer diameter of the flange b. The air escape groove is formed by connecting to the lower end of the air. Therefore, when the container containing the contents is heated in the range, the outer lid is pushed up by the internal pressure, the upper portion of the closed protruding groove 5 is opened, and water vapor is discharged from the protruding groove 5 (FIG. 2a). However, when cooled, it returns to its original state even if the pressure is reduced, and the upper portion of the ridge groove 5 is closed (FIG. 2b).
[0010]
The side wall 3 is provided upright on the inner upper side of the flat plate portion 1, and a stacking rib 8 is formed on the outer surface of the side wall 3 over the flat plate portion 1, and the tip of the stacking rib 8 has the same or slightly smaller diameter as the outer diameter of the flange. If the stacking rib 8 and the convex groove 5 are formed on the same side surface at the same position as the outer periphery of the flat plate portion 1 or not reaching the outer peripheral edge, a step is formed at the upper end of the convex groove 5. . The stacking rib 8 and the ridge groove 5 are preferably in appearance when they are on the same side surface, but need not be at the same position (side surface), and may be in a shifted state (position).
[0011]
The canopy plate 4 is an upper surface portion of the outer lid A connected to the side wall 3, and the form thereof is arbitrary such as a planar shape, a concave shape, and a mountain shape, and the back surface of the canopy plate 4 is hooked with tableware or seasonings. It is also possible to provide a nail piece or the like.
[0012]
The container body B has a form and configuration well known in this technical field. For example, a heat-resistant molding resin is formed into a cup shape by injection molding, and an appropriately shaped flange b projects to the outer periphery of the opening. When it is formed and the inner lid C is sealed and the outer lid A is covered, it comes into contact with the flat plate portion 1 and seals the inside to be in a closed state. The shape of the container body B is any three-dimensional shape such as a square shape, a rectangular shape, a hexagonal shape, etc., a circular shape, an elliptical shape, etc., and the flange b can be easily thermally bonded to an inner lid made of any material. The protruding portion 9 may be provided continuously or discontinuously in a ring shape.
[0013]
The molding resin uses a soft or hard heat-resistant synthetic resin, such as PP, PS, PET, PE, etc., and can be molded into a transparent, translucent, opaque, etc. as a container body, and an appropriate pattern on the inner surface or outer surface. A label on which characters are printed may be in-mold. These resins generally have no light-shielding property or barrier property and have light or oxygen permeability. However, the container body B can be obtained by in-molding a barrier label into the container body B integrally. As a whole, it has light shielding properties or barrier properties.
[0014]
Like the container body B, the inner lid C has a form and configuration well known in this technical field, and is a top seal material that seals the flange b after the contents are stored in the body B. In normal times, this sealed state is maintained, but when the contents are cooked, they are peeled off and removed.
[0015]
【The invention's effect】
In the present invention, a skirt portion that is in close contact with the outer periphery of the flange is provided on the outer periphery of the flat plate portion that is in contact with the upper surface of the opening flange of the container body, and a convex groove is formed on the outer surface of the skirt portion from the upper end to the lower end, and at the lower portion of the inner surface. A stopper rib is formed, a side wall is provided on the inside upper part of the flat plate portion, and a stacking rib is formed over the flat plate portion on the outer surface of the side wall, and the tip of the stacking rib is made the same or slightly smaller in diameter than the flange outer diameter. When the inner lid that is sealed when the contents stored inside are cooked is removed and the outer lid is put on again, the flat portion of the outer lid comes into contact with the upper surface of the opening flange and the outer periphery of the flange also The upper part of the skirt is in close contact, so there is no risk of the contents leaking even if there is no inner lid. In this state, heating with a microwave oven raises the temperature inside the main unit and generates steam. However, the inner pressure rises and the outer lid is pushed up, but the water vapor is removed from the protruding groove formed in the skirt, and the inner pressure does not rise, the flange does not come into contact with the stopper rib, and the outer lid does not come off, There is no scattering.
[0016]
Next, when the internal temperature drops, the inside of the container body is decompressed and returns to its original state, and the outer lid seals the opening of the container body and the contents are not leaked. For example, cooking is performed at a convenience store or the like. Later, even when taken home, the sealed state is maintained, contents such as soup are not leaked, and the container body is not collapsed.
[0017]
In addition, the convex groove can be formed integrally when manufacturing the outer lid, and there is no need for post-processing such as conventional steam holes, drilling, and cutting, and there is no need to worry about cost increases in material costs and processing costs. At the same time, there is no risk of contamination of accessories such as spoons due to foreign matters or static electricity during the distribution stage.
[0018]
Furthermore, if the ridge groove and the stacking rib are formed on the same side surface, the protrusions are aligned, the appearance is not impaired, and the commercial value is increased to add value.
[0019]
Furthermore, when a temporary fixing protrusion is provided on the inner surface of the skirt, the flange of the container body is sandwiched between the temporary fixing protrusion and the back side of the flat plate portion, and is stably fixed. Can prevent sticking.
[Brief description of the drawings]
FIG. 1 is a perspective view of an outer lid.
2 is a cross-sectional view taken along line 2-2 in FIG. 1, where a is when heating and b is when cooling.
3 is a cross-sectional view taken along line 3-3 in FIG. 1, where a is when heating and b is when cooling.
FIG. 4 is a cross-sectional view before heating (sealed state with an inner lid).
[Explanation of symbols]
A is an outer lid, B is a container body, b is an opening flange of the container body, C is an inner lid, 1 is a flat plate portion, 2 is a skirt portion, 3 is a side wall, 4 is a canopy plate, 5 is a ridge groove, 6 is Stopper rib, 7 is a temporary protrusion, 8 is a stacking rib

Claims (3)

Abutting the flat plate portion to face the opening flange of the container body, and the skirt portion are formed Ru as depending from the outer periphery of the flat plate portion, a side wall provided inside of said plate, canopy plate was connected to the side walls An outer lid of a container provided with
The skirt portion is in close contact with the outer peripheral edge of the opening flange so as to reciprocate freely in the hanging direction of the skirt portion,
In the skirt part,
A protruding groove that is formed to protrude outward so as to be continuous in the hanging direction of the skirt portion, and serves as an air escape groove when the internal pressure of the container body increases
A stepped portion that is formed continuously with the flat plate portion and closes the convex groove by contacting the opening flange when the internal pressure of the container body is lowered;
A stopper rib that is formed to project inward so as to face the opening flange with a predetermined distance from the flat plate portion, and that suppresses movement of the outer lid when the internal pressure of the container body rises;
The outer lid is pushed up as the internal pressure of the container body rises, so that the stepped portion is separated from the opening flange to open the convex groove, and the stopper rib is hooked on the opening flange. The outer lid of the container characterized by the above . Stacking ribs on an outer surface of the side wall is formed across the flat portion, that the front end of the stacking ribs and the same or slightly smaller diameter and the opening flange outer diameter, said ridge groove and said stacking rib is formed on the side surface The outer lid of the container according to claim 1. The container outer lid according to claim 1 or 2, wherein a temporary fixing protrusion is formed on the skirt portion with an interval corresponding to the thickness of the opening flange of the container body between the flat plate portion.

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