Receptacles – Receptacle having flexible – removable inner liner – Means for venting air trapped between the liner and its...
Patent
1996-01-29
1998-06-16
Moy, Joseph M.
Receptacles
Receptacle having flexible, removable inner liner
Means for venting air trapped between the liner and its...
220468, 156185, B65D 2308
Patent
active
057657106
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a packaging container and a method of 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.
Such package containers in the form of 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. Moreover, the liquid food held in the container cannot been seen through the container.
In contrast, metallic cans are suitable for sale using vending machines because they are strong against impacts and have a sufficient hardness.
However, conventional metallic cans have problems in that a difficulty exists in crushing thrown-away empty cans, and that laborious work is needed to separately collect aluminum cans and steel cans.
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 metallic cans, it is an object of the present invention to provide a packaging container which can be easily collected after use, which allows liquid 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 of forming the package container as set forth above.
DISCLOSURE OF THE INVENTION
A packaging container according to the present invention comprises a holding container formed by deforming a multi-layer sheet made of a resin according to a thermoforming method, a lid made of a resin and adapted for sealing the holding container, and an exterior covering surrounding the exterior of the holding container and made of a non-metallic material having a hardness and a thermal insulating performance higher than those of the holding container.
Since no metal is used in the packaging container, the packaging container can be easily crushed after being thrown away, facilitating the collection of the packaging container.
Also, since the holding container and the lid are made of resin and the exterior covering is made of a non-metallic material, the packaging container can be directly heated by dielectric heating in the case where food held in the packaging container is heated in a vending machine before being sold. Accordingly, the food can be heated to a sufficient temperature within a short time.
Moreover, since the exterior covering has a good thermal insulating performance, the packaging container can be held by hand even immediately after being taken out from a vending machine, and the food held therein is prevented from quickly getting cold.
In another packaging container according to the present invention, a forward-end expansion method is employed as the thermoforming method. In this case, a holding container is formed which is well balanced in wall thickness, and has bottom and side walls which are thin and uniform. In addition, the holding container can be made lighter, and the air tightness can be increased.
In a method according to the present invention for forming a packaging container, a holding container is formed by deforming a multi-layer sheet made of a resin according
REFERENCES:
patent: 4604307 (1986-08-01), Spreeuwers
patent: 4702390 (1987-10-01), Rinkovsky, Sr.
patent: 4766019 (1988-08-01), Michaels et al.
patent: 5238715 (1993-08-01), Wefers et al.
Moy Joseph M.
Tetra Laval Holdings & Finance S.A.
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