JP2005138909A - Sealed container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed container whose cover is easily opened and closed with increased airtightness by giving careful consideration to a folded engaging edge part. <P>SOLUTION: This relates to a sealed container whose airtightness is realized by the fitting edge part of the container and that of a cover placed thereon. At least the opening edge side of the folded fitting edge part 3 of the container 1 and that of the cover 2 are folded roughly in an S shape, the top parts 1c, 2c between the opening edge sides 1a, 2a and outer edge sides 1b, 2b are formed round, and wide flange parts 1d, 2d are formed on the outer edge outer periphery of the folded fitting part of the container and the cover. The container and the cover are made of polyester resin. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a hermetically sealed container that includes a container and a lid, and prevents invasion of germs such as food and prevents liquid contents from leaking to the outside.

  Among foodstuffs, especially high-moisture side dishes and soups need to improve the sealing (airtightness) between the container and the lid. FIG. 4 shows an example of a conventional sealed container. In order to improve the sealing performance between the container 10 and the lid 11, a bent fitting edge 12 is provided on the outer periphery of the container 10 and the lid 11. The bent fitting edge portion 12 also has a meaning of increasing the strength of the container 10 and the lid 11, and is formed in an annular shape with a face-down U-shaped cross section. Normally, the entrance side of the bent fitting edge portion 12 is opened by a draft angle, and has a tapered shape. Since both the container 10 and the lid 11 are flat on the rim side wall surfaces 10a and 11a, the outer rim side wall surfaces 10b and 11b, and the ceiling portions 10c and 11c between the rim side and the outer rim side, both wall surfaces should be in close contact with each other. There are few. The part which does not closely_contact | adhere depending on the fitting condition at the time of a fitting arises. There are cases where the soup of the contents leaks. Although some of the slopes of the side wall surface 10a of the lip as shown in FIG. 5 proposed in Japanese Patent Laid-Open No. 8-244811 are made larger than before, the ease of fitting at the time of fitting has been improved. However, the point that contributes to the improvement of the sealing performance is not clear.

  For improving the sealing performance of the bent fitting edge provided on the outer peripheral portion of the container and the lid, besides the above known examples, JP-A-7-32953, JP-A-7-206020, JP-A-8-80959, etc. Is seen. In both cases, the mouth side wall surface, the outer side wall surface and the upper wall surface forming the bent fitting edge are flat.

Japanese Patent Laid-Open No. 8-244811 JP 7-132953 A JP-A-7-206020 JP-A-8-80959

  The present invention intends to provide a sealed container that can be easily opened as well as closed, while further improving the sealing performance by further studying the bent fitting edge of the sealed container.

  As a result of studying the above problems, first, in the invention described in claim 1, in a sealed container having a structure in which a container is covered with a lid and sealed with a fitting edge, at least the mouth side of the bent fitting edge of the container and the lid is provided. It was made into the structure which bent in the substantially S shape and formed the ceiling part between the mouth edge side in the bending fitting edge part of a container and a lid | cover, and the outer edge side roundly.

  The term “at least” means that the outer edge side is bent in a substantially S shape in addition to the mouth side of the bent fitting edge of the container and the lid. When bent in a substantially S shape, it is easy to slip when the lid is fitted, the sealing performance is improved, and the lid does not come off naturally. Moreover, the adhesiveness of a container and a lid | cover improves rather than planes by forming round. In particular, the adhesiveness becomes better by making the radius of curvature of the ceiling of the bent fitting edge of the lid slightly smaller than that of the container.

  Furthermore, in the invention described in claim 2, the bent side of the bent fitting edge of the container and the lid is formed by bending the mouth side of the bent fitting edge in a substantially S shape and forming a circle between the outer edge side and the outer edge side. A wide brim portion was formed on the outer periphery of the outer edge.

  In addition to such a structure, if the material of the container and the lid is a polyester (PET, polyethylene terephthalate is particularly preferable) resin, the resin is sticky, and the adhesion between the resin of the container and the lid increases. In addition, it is possible to prevent the outer edge side of the lid from entering inward due to the soft property peculiar to the PET resin by providing the flange portion, and the lid can be smoothly closed. Of course, polypropylene (PP), polyethylene (PE), and other synthetic resins can be handled in the same manner as PET, but PET is the best from the viewpoint of product form, reuse, and regeneration. By making the outer diameter of the container and the outer diameter of the lid the same diameter, it is possible to prevent the lid from coming off even if the sealed containers contact each other during transportation.

  In addition to the above structure, a water repellent agent may be provided in the close contact portion of the bent fitting edge of the container or the lid. Even when the mouth side is bent into a substantially S-shape during molding or when the gap between the mouth side and the outer side is rounded, some molding unevenness may occur. In addition, it may be an approximate shape that is not completely S-shaped for convenience of design, and when the closeness of the bent fitting edge portion does not satisfy the required performance, the water repellent is present in the close portion, The leakage of the contents can be prevented. It is effective to use a water repellent agent such as polypropylene, polyethylene, polycarbonate, etc., where the adhesion between the container and the resin at the bent fitting edge of the lid is not as good as that of the PET resin.

  Most of the known water repellents can be used. However, in a sealed container where the contents are predicted to be food, a water repellent that is harmless to the human body is used. Examples of water repellents are water-insoluble water-repellent compounds such as paraffin-based, silicone-based and higher fatty acid ester-based compounds, and water-repellent oils such as vegetable oils. These water repellents may be included in the synthetic resin forming the sealed container, or may be mixed with the mold release agent at the time of molding or shared with the mold release agent. Furthermore, you may paint after shaping | molding.

  Since the sealed container has the above-described structure, the sealing property of the bent fitting edge is very good. In addition, the bent fitting edge was rounded over the entire circumference, improving the design. The collar portion facilitates fitting when the lid is closed, and serves as a knob when the lid is opened, facilitating handling. Furthermore, if the lid and the container are made of PET resin and have a structure having a water repellent at the close contact portion of the bent fitting edge of the container or the lid, the fitting is easy, the sealing performance is improved, and the product quality is improved. It is an eco product that can be easily reused and recycled.

  Hereinafter, the sealed container according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway front view of the sealed container according to the present invention in an opened state. FIG. 2 is an enlarged cross-sectional view of the bent fitting edge of the container and the lid. FIG. 3 is an enlarged cross-sectional view of a bent fitting edge portion that is fitted on a container with a lid. The illustrated sealed container of the present invention is a bent fitting edge 3 formed in a reverse groove shape by covering a circular container 1 made of PET resin with a circular lid 2 made of PET resin and bending the peripheral edge. It has a sealed structure. There are various sizes, but in this case, the diameter is 100 mm and the depth is 40 mm. In such a sealed container, the mouth edges 1a and 2a of the bent fitting edge 3 of the container 1 and the lid 2 are bent in a substantially S shape. In this example, the outer edge sides 1b and 2b are also bent in a substantially S shape. When the curved wall surfaces of the bent fitting edges of the container 1 and the lid 2 are brought into close contact with each other in the S-shape, the sealing performance of the container becomes very high.

  Further, in the present invention, in such a sealed container, the ceiling parts 1c and 2c between the mouth edge side and the outer edge side of the bent fitting edge part 3 of the container 1 and the lid 2 are formed in a round shape. At this time, the inner side R on the lid side is slightly smaller than the outer side R of the container so that the bent fitting edge of the lid holds the fitting edge of the container. This made it possible to further improve the sealing performance of the container.

  In addition, wide brim portions 1d and 2d are formed on the outer peripheries of the bent fitting edge 3 of the container 1 and the lid 2. The width of the brim portion is 1.5 mm. When the wide flange portions 1d and 2d are also covered with the lid 2 and fitted with the bent fitting edge 3, the flange portions 1d and 2d are brought into close contact with each other over the entire circumference, thereby further improving the sealing performance of the container. The outer edge 2b is not folded.

  A sealed container having the same shape as that of the above example was formed by pressing from a polypropylene material sheet. At that time, the sheet surface was thinly coated with liquid paraffin wax and then pressed. As a result, as compared with the conventional sealed container made only of polypropylene, the sealing performance was improved and the sealed container was easy to open as well as to close the lid.

It is a partially broken front view of the closed state of the sealed container of the present invention. It is an expanded sectional view of the bending fitting edge of a container and a lid. It is an expanded sectional view of the bending fitting edge which fitted the container with the lid | cover. It is sectional drawing of the conventional sealed container. It is an expanded sectional view which shows an example of the conventional bending fitting edge part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 1a Mouth side 1b Outer edge side 1c Ceiling part 2 Lid 1d collar part 2a Mouth side 2b Outer edge side 2c Ceiling part 2d collar part 3 Bending fitting edge part

Claims (3)

In a sealed container having a structure in which a container is covered and sealed with a fitting edge, at least the mouth side of the bent fitting edge of the container and the lid is bent in a substantially S shape, and the bent fitting edge of the container and the lid A sealed container characterized in that the ceiling portion between the mouth edge side and the outer edge side is rounded. In a sealed container having a structure in which a container is covered and sealed with a fitting edge, at least the mouth side of the bent fitting edge of the container and the lid is bent in a substantially S shape, and the bent fitting edge of the container and the lid A sealed container characterized in that the ceiling part between the mouth edge side and the outer edge side is formed round and a wide brim part is formed on the outer periphery of the outer edge of the bent fitting edge part of the container and the lid. In a sealed container having a structure in which the container is covered with a lid and hermetically sealed at the fitting edge, both the container molded from the polyester resin sheet material and at least the mouth side of the bent fitting edge of the lid are bent in a substantially S shape, The ceiling portion between the mouth edge side and the outer edge side of the bent fitting edge portion of the container and the lid is formed in a round shape, and a wide brim portion is formed on the outer periphery of the outer edge of the bent fitting edge portion of the container and the lid. And sealed container.

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