Sealed container and manufacturing method thereof

Abstract

It is an object of the present invention to provide a container in which it is difficult for liquid to drip at a mouth portion having a good touch sensation by forming a structure in which a welded portion that was laser welded in a sealed container does not form a flange, and to carry out the achievement of making polymer material unnecessary and making excessive material in the seaming portion unnecessary. Further, it is also an object to construct the lid and barrel of the vessel by using the same material, thereby facilitating the recycling of material. The sealed container in which a container body 1 having an opening 9 is sealed by a lid portion 3 which closes and covers said opening, comprising a welded portion 4, 14 in which an outer wall surface of a peripheral portion 2 of said opening or an edge 12 surface of said opening and an inner wall surface of said lid portion are laser welded in order to make it possible for at least an inner wall surface of the peripheral portion of said opening from an inner wall surface 6 of said container body to make contact with container contents.

Description

TECHNOLOGICAL FIELD [0001] The present invention is related to a sealed container in which contents such as foods and beverages and the like can be sealed with good sealing performance and there is little dripping of liquid at a mouth portion having a good touch sensation, and in particular to a sealed container having a welded portion that was laser welded and a manufacturing method thereof. PRIOR ART TECHNOLOGY [0002] As for a sealed container, for example, as for a beverage container, various containers such as bottles, cans, plastic containers and the like are known. In recent years, cans and plastic containers have been widely used from the viewpoint of convenience such as the quality of the handling performance thereof and the like. Of these, cans are in wide circulation because the container cost is low, the industrial speed is fast, the transportation efficiency is high and the like. These cans are usually formed from a cylindrical “body portion” which includes a bottom and ...

AI Technical Summary

Benefits of technology

[0020] In the sealed container of the present invention, because the welded portion that was laser welded does not form a flange, there are no uneven shapes, the touch sensation of the mouth portion is good, and liquid dripping rarely occurs. This is achieved even without the use of polymer materials and excessive material of a flange portion which were required in metal cans. Further, the lid portion can be miniaturized. Furthermore, when the sealed container is a plastic container, because it does not require a screw-in type lid, the filling speed and transportation efficiency can be improved, and the recyclability of the container can be improved because the container body and the lid portion can be made of the same raw material. At this time, because it has translucency, the container contents become visible in the same way as a glass bottle. Further, in accordance with the method of manufacturing a sealed container of the present invention, connecting is very easy because it can be carried out just by irradiating the connected surfaces with the laser, and there is no formation of a flange at the connection place.

Problems solved by technology

For this reason, a polymer material is required, and the use amount of metal material becomes large.

However, with regard to plastic beverage containers, it is difficult to carry out the seaming process, and plastic can containers for beverages are not distributed.

However, this cap forms a main cause of large cost increases in the whole container.

Furthermore, because the cap is mainly made of PP (polypropylene), it becomes a hindrance to recycling.

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