JPS5922054Y2 - Lid for food containers - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lid for a food container, and in particular, provides a lid for a food container that has excellent sealing and unsealing properties and can be subjected to heat sterilization such as boiling or retort sterilization. It is something.

Conventionally, the lids of synthetic resin containers for foods, etc. that are subjected to heat sterilization are made of a single-layer or multi-layer sheet material with the opening of the container sealed by heat sealing, etc., and when opened, it must be done with a knife, etc. However, since heat sterilization is performed after filling the contents, the heat resistance during heat sterilization,
When considering sealability, there is a problem in that the seal cannot be opened easily due to the use of a sheet made of a high-strength material, the strong fusion by heat sealing, etc.

In addition, metal containers are used as containers other than synthetic resin that can withstand heat sterilization, but the structure for opening these metal containers requires a score (cut groove) on the opening surface.
A pull-open type has been devised, but the manufacturing process is complicated and the cost is high.

The present invention eliminates the drawbacks in view of the above points, and will be described in detail below with reference to embodiments and drawings.

Figures 1 and 2 show a plan view and a sectional view of an embodiment of the lid body of the present invention, and the lid body A of the present invention is integrally molded from thermoplastic synthetic resin such as polyethylene or polypropylene. The film C is heat-sealed to the back surface of the molded lid part B.

As shown in FIGS. 1 and 2, the molded lid part B includes a flange 1 for heat-sealing to, for example, a flange of the container body, and an inner peripheral wall formed by hanging from the inner peripheral edge of the flange 1. 2, a bottom wall portion 3 is formed integrally with the bottom wall portion 3, which is formed horizontally inward from the lower edge of the inner peripheral wall 2.

This bottom wall part 3 is formed into an opening part 4 and an unsealing part 5 according to the shape of the opening.
are separated by a rectangular slit 6.

Further, the unsealing portion 4 surrounded by the slit 6 and the unsealing portion 5 corresponding to the remaining bottom wall portion 3 are connected by a connecting portion 7 at one corner of the rectangle, for example.

Furthermore, among other parts of the slit 6, for example, in the center of each side of the rectangle, bridges 8 are formed in consideration of moldability and post-processing.
It is connected at several places.

Here, in order to connect the unsealed part 4 to the unsealed part 5 even after unsealing, the connecting part 7 may have approximately the same wall thickness as the other parts, that is, the unsealed part 5 and the unsealed part 4. The bridge 8 needs to be thinner than the other parts, as shown in the sectional view of FIG. 3, so that it can be cut off at the same time as the film C when the package is opened.

However, in the case of a full open type in which the unsealing part 4 is completely cut out, the connecting part 7 can be deleted or the connecting part 7 can be made into a bridge 8.

A gap 9 is formed in the center of the unsealing part 4, and a tension tab 10 is connected to the unsealing part 4 via a tab connecting band 11 at a position within the gap 9.

This tension tab 10 is formed at a distance from the film C so that it does not come into contact with the back surface of the molded lid part B when the film C is sealed, and is also formed at a distance from the film C.
A protrusion 12 for cutting out the film C is formed on the upper surface of the end portion in the direction opposite to 1 in a range that is safe to touch with fingers.

On the other hand, the film C heat-sealed to the back surfaces of the opening part 4 and the unopening part 5 of the molded lid part B includes at least one resin layer of the same type as the imposing lid band B, and the other resin layer is made of nylon. , one in which resins such as polyester terephthalate are laminated, and one in which aluminum foil is laminated between the resin layers can be used.

Here, the process of heating the molded lid part B and the film C will be explained with reference to FIG.
The molded lid part B is placed on a sheet holder 14 having a molded lid part B, and then the film C is loaded on the back side of this molded lid part B, and a sealing hot plate 15 is pressed from above to form the molded lid part B. Heat seal Film C completely.

Next, to explain how the lid A of the present invention is used, as shown in FIG. When used in a container having a container, after filling the container body 16 with the contents such as food, the flange 1 of the lid A and the fusion flange 17 of the container are polymerized, for example, heat sealing,
Heat fusion shall be performed by means such as ultrasonic sealing.

Since the container is completely sealed by heat-sealing the flange portion 1 and the flange portion 17 in this manner, the container can withstand heat sterilization as a post-treatment.

When unsealing, as shown in FIG.
As shown in the figure, by hooking a finger on the tension tab 10 and pulling it, the film C is cut along the shape of the slit 6, and at the same time, the bridge 8 is also cut and opened.

In the above embodiment, the shape of the container is circular and the shape of the opening is rectangular, but as shown in FIGS. 7a, 1) and c, containers of various shapes can be used, and various opening shapes can be selected.

The present invention has the above-mentioned structure. Conventionally, synthetic resin containers that require heat sterilization require the use of scissors or a knife when opening the container by melting and adhering a sheet made of the same material as the container to increase the sealing strength. The present invention has excellent sealing properties, can be sterilized, and can be easily opened without using a knife. Sealing can be easily done by heat sealing, and by using the same type of resin as the container for sealing and film on the container, it is possible to melt and adhere, making it easy to seal and adhere to the container, which is conventionally used as a container for heat sterilization. It is a practical lid that can be manufactured at a lower cost than open metal cans.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of the lid of the present invention, FIG. 2 is a sectional view showing the OO' cross section of FIG. 1, and FIG. 3 is the same <P-P Figure 4 is a simplified diagram showing the process of sealing the film to the molded lid; Figure 5 is a cross-sectional diagram showing the state in which the film is cut out with the protrusion of the bow tension tab; The figure is a sectional view showing a state in which the package is opened, and FIGS. 7a, l) and c are plan views showing other embodiments. A... Lid body, B... Molded lid part, C...
...Film, D...Container, 1...
- Flange, 2... Inner peripheral wall, 3... Bottom wall, 4... Opening section, 5... Unopening section, 6
...Slit, 7...Connection part, 8...
...Bridge, 9...Gap, 10...
...Tension tab, 11...Connection band for tab, 1
2...protrusion.

Claims (1)

[Scope of utility model registration request] An opening film is sealed on the back side of the molded lid, which consists of a flange that is heat-sealed to the flange of the container, and a bottom wall that is connected to the flange, and the bottom wall has an opening shape. The food is separated into an opening part and an unopening part by a slit, and a part of the opening part is connected to a pull tab, and a protrusion is formed on the upper surface of the distal end of the tab. Lid of container.