JPH0616250U - Food container lid - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an inexpensive lid for effectively preventing the water adhering to the inner surface of the lid from flowing out to food. A lid having a large number of minute recesses on the inner surface side of a food container and covering the upper surface of a food container containing a food containing water.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lid that covers the upper surface of a food container that stores food containing moisture, and more specifically, a food container that stores food containing moisture such as rice and prepared foods in a warm state, or The present invention relates to a lid which is placed in a container in a cold state and then used to warm food by using a microwave oven or the like when eating, to cover the upper surface of the food container.

[0002]

[Prior art]

 Generally, when warm food containing a large amount of water is placed in a container and the lid is covered to cover the container before cooling, or when cold food containing a large amount of water is placed in the container and then the lid is placed to cover the container. When the food is covered and heated in a microwave oven in that state, a large amount of water evaporated from the food adheres to the inner surface of the lid. With conventional lids, when the lid is removed from the container in this state, a large amount of water attached to the inner surface of the lid concentrates on a portion of the food in the container and flows down, resulting in spoiling the taste of the food or making it cold. There was a problem saying.

In order to solve such a problem, it is conceivable that the lid structure is made of a material that absorbs moisture on the inner surface, for example, a lid having a water-absorbent sheet adhered thereto. However, there is a drawback that the manufacturing cost is high.

[0004]

[Problems to be solved by the invention]

 The present invention has been made in view of the above-mentioned problems of the conventional art, and an object of the present invention is to provide an inexpensive lid for effectively preventing the water adhering to the inner surface of the lid from flowing out into food.

[0005]

[Means for Solving the Problems]

 The present inventors have found that when a large number of recesses are provided on the inner surface of the lid of a food container, the evaporated water does not drop downward and is stored in the recesses, and the present invention was completed. It was

That is, according to the present invention, a lid is placed to cover the upper surface of a food container that contains food containing water, and the lid has a large number of fine recesses on the inner surface of the food container. Provided is a lid for a food container, which comprises:

The lid according to the present invention is usually a thermoplastic resin sheet or a thermoplastic resin foam sheet thermoformed. As the thermoplastic resin, polyethylene, styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene-maleic anhydride copolymer, styrene-butadiene copolymer, styrene-acrylonitryl-butadiene copolymer Styrene resins such as olefins such as branched low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, propylene-butene copolymer, propylene-ethylene-butene copolymer, etc. Resin: Polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, various nylons, etc. are exemplified, but in terms of heat insulation, shape retention, workability of recesses, etc., it is most preferable to use a polystyrene foam resin sheet. preferable.

The thickness of the resin or foamed sheet is usually about 0.5 to 5 mm. When a foamed sheet is used, a foaming ratio of 3 to 20 is suitable, and a film made of the above thermoplastic resin may be laminated on the outer surface of the foamed sheet.

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

There is no particular restriction on the diameter of the opening of the recess, but it is preferable that the width of the partition formed between the recesses adjacent to each other is larger than the width of the partition in view of the effect.

The maximum length of the opening diameter of the recess is usually 0.3 to 5 mm, preferably 0.5 to 4 mm, and more preferably 0.7 to 3 mm. The depth of the recess is preferably 0.3 mm or more. 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. Rather, it can be said that the workability is better when the through holes are formed rather than when the non-through holes are formed because the chips during processing can be removed better.

The shape of the recess and the shape of the cross section are not particularly limited, but in view of workability, it is desirable that the shape be circular or elliptical. The recess may have a cross-sectional area that gradually increases toward the inner side of the food container, that the cross-sectional area gradually decreases, or that the cross-sectional area does not change. In order to retain water effectively in the state where the shape of the lid is high, it is preferable that the cross-sectional area gradually increase toward the inside of the food container. Further, such a gradual increase can prevent the adhesive from entering the pores as much as possible when the through holes are formed in the foam sheet and the film is laminated using the adhesive.

When the lid is formed of a foamed sheet or a laminated body of a foamed sheet and a film, the bubbles forming the foamed sheet are formed on the peripheral wall of the recess (non-through hole or through hole) formed in the foamed sheet. Since the holding power of water is further enhanced when is open, it is desirable to design so that the air bubbles in the peripheral wall of the recess are released.

The non-through holes are usually continuously formed in a sheet before being formed in a container by using a needle or a laser. Especially when using a needle, it is difficult to form open air bubbles in the peripheral wall of the non-through hole if the temperature of the needle is too high.Therefore, be careful of the temperature conditions when forming this. Need to pay.

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 the same thermoplastic resin sheet or thermoplastic foam sheet 1 as a container portion b for containing food. As shown in FIG. 3, a large number of non-penetrating 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, or a large number of through holes 3'are formed in advance. On the upper surface of the provided thermoplastic foam sheet 1, a film 4 is covered and recesses 2 are provided.

In FIG. 2, the lid a is formed as a disc-shaped plate body, and is used by being placed on the upper surface of a cylindrical container b containing food.

[0017]

[Action and effect]

 The lid of the food container of the present invention has the above-described structure, and is formed into an appropriate shape as described above and used by fitting it to the container b containing the food, or when the existing container b is to be delivered or the like. Although it is mounted on the upper surface and used, the water in the water vapor evaporated from the food contained in the container b directly stays in the concave portions 2 of the lid a, or the non-through holes 2 ', After flowing into the through holes 3'and entering these recesses 2, they are not discharged to the outside due to surface tension, and are stored as they are, thus there is no risk of dripping on the food. As described above, the present invention can be easily obtained from inexpensive materials and is suitable for storage and delivery of food. Further, as described above, when the concave portions 2 ... Are particularly provided in the foamed sheet, the concave portions 2 ... Communicate with the original foamed pores to increase the internal volume and further expand the storage range. be able to.

[0018]

【Example】

 A plurality of through holes were formed in a polystyrene foam sheet having a foaming ratio of 12 times and a thickness of 1.5 mm by using a needle heated to 70 ° C. Then, a low-density polyethylene film (thickness 20 μm) was laminated on the entire one surface of the sheet using an adhesive. Each non-penetrating hole was slightly expanded toward the opening, and the opening had a length of 1.5 mm and a width of 1.2 mm. In addition, open bubbles were observed on the peripheral wall surface of the non-through holes. Next, freshly cooked rice is stored in a container formed by thermoforming a polystyrene foam sheet, and the upper surface thereof is covered with the above-mentioned 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 20 minutes, the laminated sheet was lifted upside down and inverted. As a result, water attached to the inner surface of the sheet did not flow from the lid. For comparison, the same test as above was carried out using the same laminated sheet as described above but without forming the non-through holes, and when the laminated sheet was lifted in place, it adhered to the inner surface of the laminated sheet. A large amount of water fell into the container. Subsequently, when the laminated sheet was lifted and inverted, most of the attached water remaining on the laminated sheet fell into the container during the inversion.

[Brief description of drawings]

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

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

FIG. 3 is a cross-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 foamed sheet having a through hole.

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

[Explanation of symbols]

 a ... Lid of food container b ... Container portion 1 ... Sheet 2 ... Recessed portion 2 '... Non-through hole 3' ... Through hole 4 ... Film

Claims (4)

[Scope of utility model registration request] 1. A lid which covers a top surface of a food container containing a food containing moisture, wherein the lid has a large number of fine recesses on the inner surface side of the food container. Container lid. 2. The lid of a food container according to claim 1, wherein the lid is formed of a foam sheet. 3. The lid of a food container according to claim 1, wherein the lid is formed of a laminated body of a foam sheet and a film, and a surface of the foam sheet is an inner surface of the food container. 4. The lid of a food container according to claim 2 or 3, wherein bubbles are opened in the peripheral wall portion of the recess.