JP2000153876A - Hermetically-sealed molded container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a flange to improve adhesion with a lid and to reliably apply hermetically sealing to a predetermined position of the flange by providing an annular rib for heat-fusing the lid on an innermost rim of the flange. SOLUTION: An annular rib 20 is provided on an innermost rim of a flange 16 of the molded container 10. Thus when food which has been cooked with heat is to be taken out of a microwave oven for example, the flange 16 can be prevented from deforming inwardly in the molded container 10 when the flange 16 of the container 10 is held for lifting. In addition, when contents are liquid or paste such as soup or sauce, the contents can be prevented from attaching to the flange 16 during transportation or the like of products. Further a flange width can be reduced, thus reducing the cost of a packaging material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed container having an annular rib provided on a flange portion of a molded container.
More specifically, the present invention relates to a hermetically sealed container which is excellent in appearance and shape retention and can reduce the cost of a packaging material.

[0002]

2. Description of the Related Art Conventionally, a hermetically sealed container in which an annular rib is provided on a flange portion of a molded container, the annular rib and a lid member are thermally welded, and an opening of the molded container is sealed is disclosed in
No. 142142, Japanese Utility Model Application Laid-Open No. 63-11352, Japanese Utility Model Application Laid-Open No. 32315/1988, and various commercially available products.

[0003] A hermetically sealed container provided with the above-mentioned annular ribs,
The flange portion of the molded container is reinforced, and the weldability with the lid material can be enhanced.Also, a predetermined sealing portion of the flange portion can be securely sealed, and the lid material can be easily opened. it can. However, as shown in FIGS. 3 and 4, the annular rib is generally provided substantially at the center of the flange portion. Therefore, in the conventional sealed molded container, when the content is in a liquid or paste form, such as a soup or a sauce, as shown by reference numeral 210 in the drawing, the content is flanged during transportation of the product or the like. This has the problem that the toner adheres to the part, the appearance becomes poor, and the commercial value of the product deteriorates.

[0004] On the other hand, the above-mentioned sealed molded container is used not only for its original purpose of hermetically accommodating and accommodating products, but also for heating and cooking such as a microwave oven and an oven. in this case,
For example, when taking out the cooked food from the microwave, when gripping the flange portion of the molded container, when lifted, the flange portion will be deformed inward of the molded container,
Had the problem that As a method of preventing such deformation, there is a method of forming a plurality of ribs at a position extending from the flange portion to the side wall portion, but there are some problems such as complicated molding of the container and poor appearance of the molded container. And a more excellent method has been desired.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hermetically sealed container having better appearance and shape retention without the above problems.

[0006]

Means for Solving the Problems In order to achieve the above object, the present inventors have intensively studied effective installation of a rib, and as a result, an annular rib is installed at the innermost edge of a flange portion. As a result, the flange portion of the molded container is reinforced, and the weldability with the lid material can be enhanced. In addition, a predetermined portion of the flange portion can be securely sealed, and the lid material can be easily opened. In addition to the advantage that the ribs are provided on the flange portion, it is possible to improve the shape retention of the container without complicating the molding process of the container and installing many ribs. I got

[0007] Further, it has been found that a product having an excellent appearance without any content adhered to the flange portion can be obtained, the flange width can be reduced, and the cost of the packaging material can be reduced. Obtained.

The present invention has been completed based on the above findings, and its gist is to cover an opening of a molded container main body having a bottom, a side wall, and a flange connected to an upper end of the side wall. In a sealed container sealed with a material, an annular rib for thermally welding a lid member is provided at an innermost edge of the flange portion.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The sealed molded container of the present invention can be used for, for example, dessert foods such as tofu, pudding, jelly and yogurt, spread foods such as butter and margarine, curry,
Sauces such as stew, hashed beef, miso soup, soup, potage soup, cream soup, consommé soup, soups such as potof, various seasoning liquids such as dressing, grilled meat sauce, various side dishes such as meat potatoes, Hachiho greens, udon , Ramen, spaghetti, etc., and can be effectively used for containers that contain foods such as pasta, especially sauces, soups and the like, including liquid or pasty ones.

As shown in FIGS. 1 and 2, the hermetically sealed container containing the above-mentioned contents is formed of a container bottom portion 12 and a side wall portion 14, and an upper end of the side wall portion 14 has a flange portion 1 formed thereon.
6 are connected in series. The material used for the molded container body formed from the bottom, the side wall, and the flange is not particularly limited, and contains the food that needs to be sterilized by heating or cooked in a microwave oven or the like. In this case, in consideration of heat resistance, light-shielding properties, gas barrier properties, and the like, it is made of, for example, polypropylene / ethylene vinyl alcohol copolymer / polypropylene. In addition, packaging materials such as polyethylene, polyvinylidene chloride, and polyethylene terephthalate can be used as appropriate.

The above-mentioned molded container body may be formed by using a conventional molding method such as vacuum and pressure molding, vacuum molding, injection molding and the like. In this case, the molded container body is
100-2000 μm, preferably 400-1000 μm
It is desirable to adjust the thickness to m. As a result, it is possible to maintain a certain strength and shape retention during heat sterilization, heat cooking, product transportation, or the like. Further, the shape and size of the molded container body may be appropriately specified based on the amount, physical properties, and the like of the contents to be stored.

The present invention is characterized in that an annular rib is provided at the innermost edge of the flange portion of the molded container. Thereby, for example, when taking out the cooked food from the microwave,
When the flange portion of the molded container is gripped and lifted, the flange portion can be prevented from being deformed inward of the molded container. In addition, when the contents are in a liquid or paste form such as a soup or a sauce, the contents can be prevented from adhering to the flange portion during transportation of the product or the like. Furthermore, the flange width can be reduced, and the cost of the packaging material can be reduced.

The shape of the annular rib is not particularly limited, and may be a semicircular cross section, a trapezoid, or the like, and may be arbitrarily specified as appropriate. As described above, the annular rib is provided in an annular shape at the innermost edge of the flange portion.However, in order to enhance the opening property of the lid member, the outer edge of the annular rib, or the outer edge and the inner edge may be formed with a rough opening. Good. In addition, when forming a rough mouth at the outer edge part and the inner edge part of the annular rib, it is necessary to shape the side wall part of the molded container main body where the rough mouth is installed in conformity with the rough mouth shape of the inner edge part.

[0014] The height of the annular rib is not particularly limited, but in consideration of the stability when the lid material is thermally welded,
It is preferably about 0.05 to 2 mm, more preferably about 0.5 to 1 mm. Further, the width of the annular rib is preferably 0.5 to 3 mm, preferably about 1 to 2 mm, and preferably 5 to 80%, and more preferably 1 to 2 mm, in consideration of the sealing property and the opening property.
About 5 to 25% is preferable.

As the lid material for sealing the opening of the molded container body, a sheet-shaped lid material, a concave molded lid used as a drop lid, or a convex molded lid used as a dome lid can be used. When using the molded lid,
A flange provided with a flange having substantially the same shape as the flange to be superimposed on the flange of the molded container body is used, and the flange provided on the molding lid and the annular rib are heat-welded.

The material of the lid is not particularly limited, but may be, for example, polyethylene terephthalate / ethylene-vinyl alcohol copolymer / polypropylene in consideration of heat resistance, light-shielding properties and gas barrier properties as in the case of the molded container body. It consists of. In addition, nylon, polyvinylidene chloride, aluminum foil, paper, and the like may be appropriately used. The thickness of the lid material is 30 to 1500 μm, preferably 50 to 200 μm in consideration of the time of the heat welding process, the problem of the pinhole, and the like.
It is desirable to adjust to.

The heat welding between the molded container body and the lid member is performed by using a method such as a hot plate seal, an ultrasonic seal, a high frequency seal, and the conditions may be appropriately set based on each material, thickness and the like. Good. For example, when a molded container main body and a lid material are heat-welded by hot plate sealing and sterilized under pressure and heat to produce a retort product, the seal strength after pressure and heat sterilization is 22.5 N / 15 mm or more. When the seal surface width of the annular rib is about 0.5 to 2 mm,
250 ° C, 0.5-2 seconds, sealing surface pressure 0.5-8MPa
/ Cm ² may be subjected to the above heat welding treatment.

[0018]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a plan view showing an embodiment of the hermetically sealed container of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. The hermetically sealed container 10 includes a container bottom portion 12 and a side wall portion 14, and a flange portion 16 is continuously provided at an upper end of the side wall portion 14. The molded container main body composed of the container bottom portion 12, the side wall portion 14, and the flange portion 16 is formed by vacuum pressure forming, and the layer thereof is made of polypropylene / polypropylene.
It is composed of ethylene vinyl alcohol copolymer / polypropylene.

The molded container body has a thickness of about 800 μm, a diameter of the bottom 12 of 80 mm, an opening diameter of 100 mm,
An annular rib 2 having a width of 3 mm, a height of 1 mm, and a semi-circular cross section is provided at a flange width of 10 mm and an innermost edge of the flange portion.
0 is formed. Also, on a part of the outer edge of the annular rib,
Crow mouth 22 for facilitating opening of sheet-like lid material
Is provided.

The molded container body is filled with a stew containing ingredients (not shown), and an annular rib 20 of a flange portion is provided.
Then, a sheet-like lid member 18 having a diameter of 12 mm covering the opening of the molded container body is heat-welded. Sheet-shaped lid 18
Is composed of polyethylene terephthalate / ethylene vinyl alcohol copolymer / polypropylene (100 μm in thickness).

The hermetically sealed container containing the stew containing the ingredients is retort-sterilized and made into a product that can be distributed at room temperature.
The product did not have any stew adhered to the container flange portion, had no large number of ribs on the container, had good appearance, had a good appearance, and had high commercial value. Further, after removing the lid material of the product, heating and cooking in a microwave oven, when taking out the product, the flange portion of the molded container is gripped, and when the product is lifted, the flange portion does not deform inward of the molded container. Was.

[0022]

According to the sealed molded container of the present invention, the flange portion of the molded container is reinforced, the weldability with the lid material can be improved, and a predetermined sealing treatment is performed on a predetermined portion of the flange portion. The lid can be easily opened. In addition, it is possible to enhance the shape retention of the container without complicating the molding process of the container and installing a large number of ribs. When the flange portion of the container is gripped and lifted, the flange portion can be prevented from being deformed inward of the molded container.

Further, according to the hermetically sealed container of the present invention, it is possible to obtain a product having an excellent appearance in which the contents are not adhered to the flange portion, and furthermore, it is possible to reduce the flange width and to reduce the cost of the packaging material. Down can be planned.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a hermetically sealed container of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a conventional hermetically sealed container.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sealing-molded container of this invention 100 Conventional sealing-molded container 12, 120 Bottom part 14, 140 Side wall part 16, 160 Flange part 18, 180 Lid material 20, 200 Annular rib 22 Karasuguchi 210 Contents attached to flange part

Continued on the front page F-term (reference) 3E033 AA08 AA10 BA16 BB08 CA07 CA16 CA19 CA20 DA07 DA08 EA04 FA02 FA04 GA02 3E067 AA03 AA04 AB28 BA07A BA10A BB14A BB16A BB25A BC07A CA04 CA11 CA17 CA24 EA27 EB14 EA35 EA35 EA35 EA35 EA35 EA35 EA35 EA35 EA35 EA35 EA35 EA35

Claims (3)

[Claims] 1. A hermetically sealed container in which an opening of a molded container main body having a bottom portion, a side wall portion, and a flange portion connected to an upper end of the side wall portion is sealed with a lid material, wherein an innermost edge of the flange portion is A hermetically sealed container provided with an annular rib for thermally welding a lid member. 2. The hermetically sealed container according to claim 1, wherein the contents contained in the hermetically sealed container include a liquid or a paste. 3. The sealed molded container according to claim 1, wherein the sealed molded container is a cooking container.