Receptacles – Receptacle side wall made of two or more layers of material... – Solid food receptacle
Patent
1997-11-06
1999-09-21
Castellano, Stephen
Receptacles
Receptacle side wall made of two or more layers of material...
Solid food receptacle
220 6222, 220 622, 215 121, B65D 2514
Patent
active
059542179
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a packaging container and a method for manufacturing the same.
BACKGROUND ART
Conventionally, bottles, paper containers, metallic cans, etc., have been used as packaging containers for holding foods such as liquid foods. These packaging containers are sealed after predetermined amounts of liquid foods are charged therein, and are then sold.
Of these package containers, bottles are not suitable for sale using vending machines because they are weak against impacts and are easily broken. Although paper containers are suitable for sale using vending machines because they are not broken by impacts, their flexibility is too high. Therefore, when a paper container is opened, it may be deformed so that liquid food held therein flows out from the spout of the container.
In contrast, metallic cans are suitable for sale using vending machines because they are strong against impacts and have a sufficient stiffness.
However, conventional metallic cans have problems that a difficulty exists in crushing thrown-away empty cans, and that laborious work is needed to separately collect aluminum cans and steel cans. Moreover, even when steel cans, aluminum cans, and the like having a reduced wall thickness are used, there is a limit in reducing their weights. Therefore, costs involved in distribution increase.
In the case where liquid foods are sold by a vending machine after being heated therein, metallic cans must be indirectly heated using hot air, because metallic cans cannot be directly heated by dielectric heating. Accordingly, it takes a prolonged time to heat liquid foods to a proper temperature. In addition, due to the poor thermal insulating performance of metallic cans, a metallic can cannot be held by hand immediately after being taken out from a vending machine. Also, liquid food held therein gets cold in a short period of time.
In view of the foregoing problems of conventional packaging containers, it is an object of the present invention to provide a packaging container which can be easily recycled after being thrown away, which allows food to be heated by dielectric heating, and which has an excellent thermal insulating performance. Another object of the present invention is to provide a method for manufacturing the package container as set forth above.
DISCLOSURE OF THE INVENTION
To achieve the above objects, a packaging container according to the present invention comprises a sleeve having upper and lower ends folded inward, a film which covers the sleeve, an inner container formed inside the sleeve, and a lid for sealing the inner container.
The film and the inner container are fused and joined integrally at folded portions of the upper and lower ends of the sleeve.
In this case, it becomes unnecessary to provide a thermally activatable adhesive or the like between the sleeve and the inner container, or to apply a thermally activatable adhesive or the like onto the inner surface of the sleeve. This facilitates storage and handling of the sleeve.
Since a material other than the film, for example, a paper substrate contacts the outermost layer of the inner container in an area other than the upper and lower ends of the sleeve, the inner container and the sleeve are not joined by fusion and maintained separated from each other.
Accordingly, when the internal pressure decreases due to cooling of a hot food charged into the packaging container, only the inner container deforms to absorb the pressure decrease, thereby preventing the sleeve from deforming. As a result, it becomes possible to set the strength of the sleeve to a minimum value required for transportation or use of the packaging container. This makes it possible to reduce costs by decreasing the wall thickness of the packaging container.
Also, it becomes easier to crush the packaging container after being thrown away, and to collect the packaging container.
Further, since the packaging container can be directly heated by dielectric heating in the case where food held in the packaging container is
REFERENCES:
patent: 3401475 (1968-09-01), Morehouse et al.
patent: 3468224 (1969-09-01), Rausing et al.
patent: 3578194 (1971-05-01), Cornelius
patent: 3662944 (1972-05-01), Joostem, Sr.
patent: 3799423 (1974-03-01), Cvacho
patent: 4281769 (1981-08-01), Ignell
patent: 4342183 (1982-08-01), Gordon et al.
patent: 4342399 (1982-08-01), Stirling
patent: 4595112 (1986-06-01), Dubois
patent: 4645695 (1987-02-01), Negi et al.
patent: 4997125 (1991-03-01), Glerum
patent: 5256427 (1993-10-01), Quick et al.
Search Report for PCT/JP96/01239 (Translates all of Japanese references), Jun. 1996.
Brkovic Rista
Kaneko Masamichi
Konno Hidetoshi
Satoyoshi Junichi
Castellano Stephen
Tetra Laval Holdings & Finance S.A.
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