JP2580728Y2 - Food container lid - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a cooked food containing moisture.
More specifically, the lid is placed so as to cover the upper surface of a food container for storing hot food, which is stored in a container for storing food containing water such as rice and prepared foods in a warm state, or a container for storing food in a cold state. The present invention relates to a lid that is placed on the upper surface of a food container that is used to warm food with a microwave oven or the like when eating.

[0002]

2. Description of the Related Art In general, a hot food containing a large amount of water is stored in a container and covered with a lid so as to cover the container before cooling, or a container after a cold food containing a large amount of water is stored in a container. When the food is heated by a microwave oven or the like in a state where the lid is covered so as to cover, a large amount of moisture evaporated from the food adheres to the inner surface of the lid. With conventional lids, if the lid is removed from the container in this state, a large amount of water attached to the inner surface of the lid will flow down to part of the food in the container and consequently impair the taste of the food or make it cold There was a problem.

In order to solve such a problem, it is conceivable to use a lid having a material that absorbs moisture, such as a water-absorbing sheet, adhered to the inner surface of the lid as a lid structure. In addition, there is a disadvantage that the manufacturing cost is high.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides an inexpensive lid for effectively preventing the water adhering to the inner surface of the lid from flowing out to food. The purpose is to do.

[0005]

Means for Solving the Problems The inventors of the present invention have found that, when a large number of recesses are provided on the inner surface of the lid of a food container, unexpectedly, the evaporated water does not fall downward and is stored in these recesses. Heading, the present invention was completed.

That is, according to the present invention, a lid is provided so as to cover an upper surface of a food container for storing cooked warm food containing water, and the lid has an opening diameter on the inner surface side of the food container. A lid for a food container characterized by having a large number of concave portions having a maximum length of 0.3 to 5 mm is provided.

[0007] The lid according to the present invention is usually formed of a thermoplastic resin sheet or a thermoplastic resin foam sheet by thermoforming. As the thermoplastic resin, polyethylene,
Styrene-based resins such as styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene-maleic anhydride copolymer, styrene-butadiene copolymer, styrene-acrylonitrile-butadiene copolymer; branched low-density polyethylene Olefinic resins such as polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, propylene-butene copolymer, propylene-ethylene-butene copolymer; polyvinyl chloride, polyethylene terephthalate, polybutylene Examples include terephthalate and various types of nylon, but it is most preferable to use a polystyrene-based foamed resin sheet from the viewpoint of heat insulation, shape retention, workability of the recessed portion, and the like.

[0008] The thickness of the resin or foam sheet is usually 0.1.
It is about 5 to 5 mm. When a foamed sheet is used, the expansion ratio is suitably 3 to 20 times, and a film made of the thermoplastic resin may be laminated on the outer surface of the foamed sheet.

In the present invention, as shown in FIG. 5, a large number of fine recesses are preferably provided all over the inner surface of the lid formed of the above-mentioned material.

There is no particular limitation on the diameter of the opening of the recess, but it is preferable that the width of the partition formed between the adjacent recesses is larger than that of the adjacent recess.

[0011] The maximum length of the opening diameter of the recess is 0.3 to 5 mm.
mm, preferably 0.5 to 4 mm, more preferably 0.7 to 3 mm. The depth of the recess is 0.3
mm or more is preferable. In particular, when the lid is formed of a laminate of a thermoplastic resin foam sheet and a thermoplastic resin film, the recess may penetrate the foam sheet as long as it does not penetrate the film. On the contrary, it can be said that forming the through-holes rather than forming the non-through-holes is excellent in workability because debris during processing can be removed well.

There is no particular limitation on the shape of the recess or the shape of the cross section. However, considering workability and the like, a circular or elliptical shape is desirable. The recessed portion may have a gradually increasing or decreasing sectional area toward the inside of the food container, or may have no change in the sectional area. In order to effectively retain moisture with the lid having high shape retention, it is preferable that the cross-sectional area gradually increases toward the inside of the food container. In the case of such a gradual increase, when a through-hole is formed in the foamed sheet and a film is laminated using an adhesive, the penetration of the adhesive into the hole can be prevented as much as possible.

When the lid is made of a foamed sheet or a laminate of a foamed sheet and a film, the bubbles constituting the foamed sheet are opened at the peripheral wall of the recess (non-through hole or through hole) formed in the foamed sheet. In this state, the holding power of moisture is further increased. Therefore, it is desirable to design so that air bubbles in the peripheral wall portion of the concave portion are opened.

[0014] The non-through hole is usually formed continuously in the sheet before being formed in the container using a needle or a laser. In particular, when using a needle, if the temperature of the needle is too high, it is difficult to form an open bubble on the peripheral wall of the non-through hole. Need to pay.

Referring to the drawings, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a indicates a lid, and the lid a is made of a thermoplastic resin sheet or a thermoplastic foam sheet 1 equivalent to the container part b for storing food. As shown in FIG. 3, a large number of non-through holes 2 'having a diameter of 0.3 to 0.5 mm and a depth of 0.3 mm or more are provided on the inner surface thereof, or a large number of through holes 3' are previously provided. On the upper surface of the thermoplastic foam sheet 1, a concave portion 2 is provided so as to cover the film 4.

In FIG. 2, the lid a is formed as a plate cut into a disk shape and is used by being mounted on the upper surface of a cylindrical container b containing food.

[0017]

The lid of the food container according to the present invention has the above-mentioned structure, and is formed into an appropriate shape as described above, and is used by fitting it to the container b containing the food, or in the case of delivery. It is used by being mounted on the upper surface of the existing container b, but the moisture in the water vapor evaporating from the food contained in the container b stays directly in the recesses 2. After flowing into the through holes 3 'and entering these recesses 2, they do not go outside due to surface tension and are stored as they are.
Thus there is no danger of dripping on food. As described above, the present invention can be easily obtained by using inexpensive materials, and is suitably used for storage and delivery of food. When the recesses 2 are provided on the foam sheet, as described above, the recesses 2 communicate with the original foamed pores to increase the internal volume, thereby further expanding the storage range. Can be.

[0018]

EXAMPLE A plurality of through holes were formed in a foamed polystyrene sheet having a foaming ratio of 12 times and a thickness of 1.5 mm using a needle heated to 70 ° C. Next, a low-density polyethylene film (thickness: 20 μm) was laminated on the entire surface of one side of the sheet using an adhesive. Each non-through hole slightly expanded toward the opening, and the opening was 1.5 mm in the length direction and 1.2 mm in the width direction. In addition, open air bubbles were observed on the peripheral wall surface of the non-through hole. Subsequently, the cooked rice is stored in a container formed by thermoforming a polystyrene foam sheet, and its upper surface is covered with the laminated sheet having a non-through hole (so that the opening of the non-through hole faces the inner surface of the container). After standing for minutes, the laminated sheet was lifted and turned upside down, and water attached to the inner surface of the sheet did not flow from the lid. For comparison, a test was conducted in the same manner as described above using the same laminated sheet as above but without forming a non-through hole, and water adhered to the inner surface of the laminated sheet when the laminated sheet was lifted in place was A large amount has flowed into the container. Subsequently, when the laminated sheet was lifted and then inverted, most of the adhesion water remaining on the laminated sheet during the inversion flowed down into the container.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lid of a food container formed in a fitting lid shape.

FIG. 2 is an example of a lid of a flat food container.

FIG. 3 is a sectional view of a lid of a food container in which a non-through hole is provided to form a recess.

FIG. 4 is a cross-sectional view of a lid of a food container in which a film is attached to a foam sheet provided with through holes.

FIG. 5 is a partially cutaway perspective view of the representative food container according to the present invention as viewed from the lower surface of the lid.

[Explanation of symbols]

 a: lid of food container b: container part 1: sheet 2: recessed part 2 ': non-through hole 3': through hole 4: film

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 63-108726 (JP, U) Japanese Utility Model Sho 58-98347 (JP, U) Japanese Utility Model Sho 62-150356 (JP, U) Japanese Utility Model Sho 63- 182120 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 39/00-55/16

Claims (4)

(57) [Scope of request for utility model registration] 1. A lid which is covered so as to cover an upper surface of a food container for storing cooked hot food containing water, wherein the lid has a maximum opening diameter of 0.3 mm on the inner surface side of the food container. 3
A lid for a food container having a large number of recesses of up to 5 mm. 2. The lid for a food container according to claim 1, wherein the lid is formed from a foamed sheet. 3. The food container lid according to claim 1, wherein the lid is formed of a laminate of a foamed sheet and a film, and the foamed sheet surface is the inner side of the food container. 4. A lid for a food container according to claim 2, wherein bubbles in the peripheral wall of the recess are opened.