JP2560410Y2 - Lunch box - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lunch box container which comprises a container body and a dome-shaped lid and is heated and distributed by a microwave oven.

[0002]

2. Description of the Related Art Conventionally, in a lunch box having a structure in which a partition rib is provided and a ceiling is closed by a flat or hill-shaped lid in a container body divided into a plurality of compartments, these lunch boxes are microwaved. BACKGROUND ART There are many known lunch containers using a lid provided with a vent or a gap for releasing water vapor generated upon heating.

For example, as shown in FIG. 4, a container body (30) and a dome-shaped lid (31) are provided. When the lid (31) is attached to the container body (30), A gap between the inside and outside of the container is formed between the container and the lid (not shown)
When heating the contents stored in the container with a microwave oven,
Japanese Utility Model Laid-Open No. 1-150583 proposes a food packaging container configured to discharge vapor generated from the contents to the outside of the container.

[0004] In addition to the lunch box, plastic trays having a flow channel designed to discharge dew water are widely used. For example, a tray that keeps, displays, and transports bread, confectionery, prepared foods, fruits, frozen foods, and so on. As a container tank (40) with a running water channel (41)
It is known from JP 7-30886. However, the above is a relatively large tray such as a container tank, and the width of the water flow groove (41) can be set sufficiently, so that the function of water tension is weak and the structure can easily flow through the groove and drain. (See FIG. 5).

[0005]

However, as shown in FIG. 4, when a food container having a hill-shaped lid (31) is heated in a microwave oven or cooled after heating, the dew condensation by water vapor ( (P) adheres to the inner surface of the lid (31),
(P) flows down the curved slope inside the lid (31) and enters the compartment (32) of the container body (30) containing the food, as shown by the dashed arrow, or falls on the food itself.

Although the above problem can be solved by providing a water flow groove (41) in the container body (see FIG. 5), a groove provided on the peripheral edge of a container having a relatively small size such as a lunch box container. The width is about 1 to 2 mm, and even if the dew water (P) attached to the inside of the lid flows on the curved slope and gathers in the narrow groove, it stays at that place due to the tension and does not flow around, and excess water accumulates ( If it is smaller than the volume of the entire groove), it overflows and enters the food storage section of the container body (not shown).

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention prevents a food container from being condensed with water (P) due to water vapor attached to the inner surface of a lid when a lunch box is heated and cooled in a microwave oven. As shown in FIGS. 1 and 2, a polygonal container body (1
0) and a dome-shaped lid (20) for closing the container, wherein a water retention groove (15a, 15b) is formed on the periphery surrounding the storage portion of the container body (10). Water retention groove (15
In the four corners of the container body (10) with rounded corners (13), the radius of curvature R1 on the inner side (17) is changed from the radius of curvature R1 on the outer side (16).
2. A lunch container comprising a container body (10) having a wide water retaining groove (15a) smaller than 2 and a dome-shaped lid (20) having a curvature toward four corners. A ventilation hole (21) is provided at the center of the four sides of the lid (20) having a shape, and as shown in the AA cross-sectional view of FIG. 3, the lower end of the inner surface of the corner (25) of the lid (20) 24) is positioned and fitted on the outside (16) of the wide water retention groove (15a) at the four corners of the container body (10) as rounded corners (13),
This is a lunch box in which the condensed water (P) flows through the wide water retaining groove (15a) and collects.

[0008] The lunch container of the present invention is, as shown in FIG.
A water retaining groove (15a, 15b) is formed on the entire periphery between the flange (12) of the container body (10) and the food storage section (11),
This water retaining groove has a constant depth and a groove width as small as possible (about 2 mm or less) except for the vicinity of the rounded corner (13).
It is formed so as to surround (11). The container body (1
The water retention grooves (15a) at the four corners of the rounded corner (13) of (0) make the radius of curvature R1 of the inside (17) smaller than the radius of curvature R2 of the outside (16),
The water retention grooves (15a) at the four corners are widened, the water retention grooves (15b) at the linear portion of the periphery are narrow, and the transition is made smooth by communicating with the wide water retention groove (15a). .

The lid (20) of the lunch container of the present invention is shown in FIG.
As shown in the figure, the whole has a curvature toward the four corners (25) in a dome shape, and a vent hole for letting out water vapor generated at the time of heating is formed in the center of each of four sides of the lid (20). (21) is provided.

When the above-mentioned lid (20) is fitted to the container body (10), as shown in the sectional view taken along the line AA in FIG. 24) are fitted so that they are located on the outside (16) of the wide water-retaining groove (15a) formed at the four corners (13) of the container body (10) with rounded corners (13). When heating or cooling it with a microwave oven, the dew condensation (P) adhering to the inner surface of the lid (20) causes the lid (20)
Flows toward the lower end (24) of the inner surface of each of the four corners (indicated by the dashed arrow), and is dropped and stored in the wide water retaining groove (15a).
It is a thing which did not enter. In addition, wide water retention groove (1
5a) When excessive dew water accumulates, it flows into the narrow water retention groove (15b) of the straight line communicating by capillary development, ensuring sufficient water retention capacity and overflowing from the water retention groove (15a, 15b). Never come out.

[0011]

According to the present invention, a dome-shaped lid (20) that collects dew condensation water (P) due to steam during heating and cooling in the direction of the corners (25) of the four corners, and forms the dew condensation water (P). Receive the water retention groove (15
a, 15b) and a container body (10) formed therein, as shown in FIG. 3, and as shown in FIG.
4) is fitted so that it is located on the outside (16) of the wide water retention groove (15a) at the four corners of the rounded corner (13) of the container body (10). Condensed water (P) adhering to the inner surface of the body (20) gathers in the four corners (25) having the curvature of the lid (20), flows down to the lower end (24) of the inner surface, and forms a rounded corner of the periphery of the container body (10). The water flows into the wide water retaining groove (15a) formed at each of the four corners, and when the condensed water collected here becomes excessive, it flows into the narrow water retaining groove (15b) in the communicating linear portion. The condensed water flowing into the narrow water retaining groove (15b) does not overflow due to the tension of water, and therefore does not enter the food storage section (11).

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a container main body in a lunch box having a plurality of storage portions according to an embodiment of the present invention and having a water retaining groove formed on the entire periphery thereof. FIG. 2 (a) is a plan view of a dome-shaped lid for closing the container, and FIG. 2 (b) is a side view of the lid having a ventilation hole in the same.

As shown in FIGS. 1 and 2, the base material of the container body (10) and the lid (20) in the lunch container of the present invention is as follows.
Using a sheet material such as a vinyl chloride resin or a polypropylene resin, a so-called sheet formed by vacuum forming or pressure forming, each having a thickness of 0.2 mm to 0.3 mm.
It is preferable that the weight is thin and light.

As shown in FIG. 1, the container body (10) is formed of a sheet using a colored polypropylene resin. For example, a plurality of storage sections (11) are provided, and a peripheral flange (10) is provided. 12), between 1.5mm and 2.0m in depth
m, a straight water retention groove with a width of about 1.5 mm to 2.0 mm (1
5b) is formed so as to surround all the storage portions (11). In this embodiment, a plurality of compartments (1
Although 1) is provided, the container body may be a single storage unit, and may be appropriately selected. The four water retaining grooves (15a) at the four corners of the container body (10) having rounded corners (13) make the inner radius of curvature R1 smaller than the outer radius of curvature R2, and widen only the vicinity of the rounded corner. The narrow water retention groove (1
5b). In this example, measured values were R1 = 4.0 mm, R2 = 9.0 mm, and the rounded inner side (17) was set to 20 mmR and the outer side (16) was set to 15 mmR.

On the other hand, as shown in FIGS. 2 (a) and 2 (b),
0) is a dome shape, the ceiling (22) is almost flat, and a curvature (increased in inclination) is provided toward the four corners (25). This is also provided with a vent hole (21) for letting out the water vapor generated in the container to prevent the container from being ruptured due to heating.

When the lid (20) is fitted to the container body (10), as shown in FIG. 3, the lower end of the inner surface at the four corners (25) of the dome-shaped lid (20). 24) is a rounded corner of the container body (10)
It is configured to be located outside (16) of the wide water retaining groove (15a) at the four corners of (13). For example, rice and prepared foods are stored in the storage section (11) of the container body, and when heated or cooled by a microwave oven, dew condensation water (P) due to water vapor attached to the inner surface of the lid forms the lid (20). The inner bottom edge of the four corners (25) (24)
The water flows down toward the water-holding groove (15a), and never gets into the storage portion (11). Further, when the dew condensation water excessively accumulates in the water retaining groove (15a), the water flows into the linear narrow water retaining groove (15b) communicated by capillary action.

[0017]

According to the present invention, the inside lower end of the dome-shaped lid is fitted to the outside of the water retaining groove formed on the peripheral edge between the flange and the surrounding portion so as to surround the entire storage portion of the container body. Lunch container of the configuration to be, when heating and cooling thereof,
The dew water adhering to the inner surface side of the lid can be reliably guided to the wide water retaining grooves formed at the four rounded corners of the container body, and the dew water flowing from the lid is reliably received by the water retaining grooves. Lunch container that can be. In addition, since the water retaining groove has a narrow width in a straight portion other than the vicinity of the four corners and surrounds all the storage sections, there is no need to provide an extra space around the container body. The accumulated water flows around the entire periphery due to the capillary phenomenon, so that a sufficient capacity can be secured and no overflow occurs.

[Brief description of the drawings]

FIG. 1 is a plan view of a container body in a lunch container having a plurality of partitioned storage portions and a water retaining groove formed on an inner peripheral edge according to an embodiment of the present invention.

FIG. 2A is a plan view of a dome-shaped lid for closing the container body. (B) It is a side view of the lid same as the above.

FIG. 3 is a sectional view taken along line AA of the lunch container of the present invention.

FIG. 4 is a partial cross-sectional view showing an example of a conventional lunch container having a dome-shaped lid.

FIG. 5 is a partial explanatory view showing an example of a water flow channel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Container main body 11 ... Storage part 12 ... Container flange 13 ... Round corner part of four corners 15a ... Wide water retention groove 15b ... Narrow water retention groove 16 ... Outside 17 ... Inner 20 ... Lid 21 ... Vent hole 22 ... Ceiling part 23 ... Knob 24 ... Inner lower end of lid 25 ... Corner of four corners 30 ... Container 31 ... Lid 32 ... Compartment P ... Dew condensation water

Claims (1)

(57) [Scope of request for utility model registration] 1. A lunch container comprising a polygonal container main body having a storage part and a dome-shaped lid closing the container, wherein a water retention groove is formed on a periphery surrounding the storage part of the container main body, At the four rounded corners of the container main body, the inner radius of curvature is smaller than the outer radius of curvature, and the container main body has a wide water retaining groove formed therein. A dome-shaped lid having a dome-shaped lid, wherein the dome-shaped lid is provided with a vent hole in the center of the four sides, and the lower end of the inner surface of the corner of the lid is a corner of the container body. A lunch container characterized in that it is fitted and fitted outside the wide water retention groove at four rounded corners.