JPS5840053Y2 - container sealing lid - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a container sealing lid.

Conventionally, when a lid 1 which has been formed with rough sealing as shown in FIG. To facilitate fitting, a circumferential projection 4 is generally provided on the inner surface of the lid to fit into the upper opening of the container.

However, in conventional lids with protruding peripheral protrusions of this type to facilitate fitting, when crystalline synthetic resin is used, residual stress from crystallization of the synthetic resin and molding of the peripheral protrusions Even if part or all of the lid is prone to deformation such as curving or twisting, and even if the lid material is made of amorphous synthetic resin, the relationship between residual stress during molding, lid size, and resin wall thickness. deformation similar to the above is likely to occur.

The dotted line in FIG. 3 shows the curved deformation.

If the above phenomenon occurs in the lid, it will be difficult to fit the lid in the desired position at the top opening of the container when filling the container with contents and closing the lid. During sealing, the lid may be misaligned, making it difficult to completely fit, and other problems may occur, such as the lid falling off before heat-sealing, or the automatic packaging machine not being able to automatically supply the lid by suction.

Therefore, when using conventional deformed lids of this type, it is necessary to slow down the packaging process to prevent the lid from falling off or shifting its position on the container body. During this period, the lid is held by various pressure means to prevent the lid material from falling off or shifting its position.

As a result of research to solve the problems caused by the conventional method, the present inventors discovered that deformation such as bending of the conventional lid material can be avoided by changing the structure of the lid body. It happened.

The present invention will be explained in detail below based on the drawings.

1.2.3 shows a conventional container lid as described above.

The lid material is shown as a laminate of paper 1a, aluminum foil 1b, and plastic 1C, with peripheral protrusions 4 on the plastic layer 1C.
It is glued together.

The drawbacks of the circumferential protrusion bonded to the plastic layer of the overlocking lid material are as described above.

In the present invention, the front surface of the lid is shaped flat, and the back surface is provided with a large number of intermittent or independent ribs 6 (projections), and at least some of these ribs should be fitted with the lid and heat-sealed. It is adapted to come into contact with the inner wall surface of the container body at a predetermined position on the container body, and further, other arbitrary ribs are formed continuously or intermittently radially from the center of the lid, and each terminal end thereof is formed in the number mentioned above. It is extended to the vicinity of each rib.

Furthermore, the number, size, and position of the numerous ribs 6 attached to the inner surface of the lid must be determined by taking into consideration the size, shape, and material characteristics (presence or absence of crystallinity) of the lid. .

Spotted portions 7 on the periphery of the figure indicate seal portions.

The material composition of the base material of the lid used in the present invention is usually paper and plastic, paper, plastic, and aluminum foil, etc.

Further, the shape of the base material of the lid may be any shape such as circular, square, rectangular, or polygonal.

The shapes of the ribs provided on the inner surface of the base material of the lid are 4th and 5th.
As shown in the figure, dotted and intermittent circumferential lines and multiple circumferential lines, or
radial array of points or lines, and combinations thereof;
Any type of lid may be used, but it must at least have ribs radially formed from the center of the lid.

In addition, the size and height of the protrusion are determined by the strength and size of the lid material, (
If the lid is circular, it may be selected appropriately depending on the diameter (if the lid is circular, the length of each side if it is rectangular).

The lid material with the above structure has radial ribs, and these ribs extend from the center of the lid to the periphery, which prevents deformation such as bending and curving of the lid, and keeps the surface of the lid flat. Therefore, the automatic supply of lids by the suction of the automatic packaging machine is not inhibited, and unlike conventional methods, a special support device is not required in the closing process. The lid material can be fitted and held in a predetermined position without deterioration, improving heat-sealability and providing a sealed container with a flat lid top surface after heat-sealing.
It is characterized by the ability to produce sealed packaged foods with excellent commercial value.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional container lid, Fig. 2 is a back view of a conventional container lid, Fig. 3 is a cross-sectional view showing the conventional container lid in a closed state, and Figs. 4 and 5 are the present invention. Figure 3 shows various different back views of the container lid. 1... Lid, 2... Container body, 6...
···rib.

Claims (1)

[Scope of utility model registration request] Container lids made of a laminate made of synthetic resin, paper, etc. have a flat surface and a large number of independent ribs on the back surface. Provided at a predetermined position on the container body to be sealed and in contact with the inner wall surface of the container body, and other arbitrary ribs are formed continuously or intermittently radially from the center of the lid, and ribs formed in this radial direction. A container sealing lid, characterized in that each end portion of the container extends to the vicinity of the several ribs.