Manufacturing container or tube from paper; or other manufacturi – Container making – Rigid container
Patent
1985-01-07
1986-10-28
Husar, Francis S.
Manufacturing container or tube from paper; or other manufacturi
Container making
Rigid container
493103, 493474, B31B 190, B31B 1746
Patent
active
046196366
DESCRIPTION:
BRIEF SUMMARY
The present invention generally relates to containers having a body of cardboard or any other material having equivalent strength properties, and the invention is more particularly directed to containers of the type which can be damaged when subjected to pressure changes, to the packed goods or to the ambient atmosphere, and in which the container comprises a container sleeve that has at least at one end a bellows bottom which in case of pressure changes in the packed goods or the ambient atmosphere can move outwards and inwards in the container thereby compensating for the pressure changes so that the cardboard container sleeve is maintained substantially unchanged, and in which the container has a protective lid exteriorly of the bellows bottom.
The invention also relates to a method and an apparatus for the manufacture of such a container. The apparatus comprises a carrier for the container sleeve and a piston means for pressing a bellows bottom blank and a lid blank respectively into the container tube, whereby a rim of the bellows bottom blank and of the rim blank respectively are folded upwards, and in which the piston means comprises a lower part and an upper part which are axially movable in relation to each other, and an expandable means between said movable piston parts which expandable means at the compression of the two piston parts is pressed radially outwards to the inner surface of the sleeve which in turn is pressed to the carrier. The carrier is formed with a welding ring for welding the rim of the bellows bottom and the lid respectively to the inside of the container sleeve.
Containers having so called bellows bottoms are previously known, for instance from the U.S. Pat. No. 3,627,171. The said previously known container having a bellows bottom is made of sheet metal or another form-stiff material, and the bellows bottom, which is flexible and made of a flexible material is connected by being folded between the container sleeve and the lid which as conventional in manufacturing of sheet metal tins are curled inwards to provide a seal lockseam. The bellows bottom alternatively can be replaced by a type of air balloon or a slidable means which is attached to the form-stiff container.
A problem in connection with containers having a body of cardboard or a similar material is that the containers change form when subjected to internal or external pressure changes and if the pressure changes are maintained for some time, for instance for some hours to some days, the container gets an undesired permanent change of form. In case of heavy pressure changes the cardboard container even break or become unsealed. Such problems normally do not appear in containers of sheet metal or other form-stiff or shape permanent materials.
In the said previously known type of container both the bellows bottom and the end or lid are connected to the container sleeve, and thereby a pressure chamber is provided between the bellows bottom and the lid. Such a sealed pressure chamber is not acceptable in containers of cardboard or a similar non-shaped permanent material, since a pressure change should lead to a change of the container both at the area inside the bellows bottom and in the area between the bellows bottom and the lid.
For different reasons some types of goods are packed in a hot state and when the said goods are cooled down the packing volume thereof is reduced. In case of such packaging it is important to compensate the pressure change by the action of the bellows bottom so that the form of the container sleeve is maintained unchanged. This is possible only if the bellows bottom can move unprevented by an exterior lid.
Further it is important that different types of goods, especially food stuffs, are packed aseptically and the filling and the closing of the container therefore preferably is made at the place where the goods are manufactured. Machines for manufacturing and closing of cans of metal, however, are so large, complicated and expensive that they generally are not suited for small or medium size
REFERENCES:
patent: 1744973 (1930-01-01), Kuechenmeister
patent: 2006548 (1935-07-01), Halle
patent: 2409460 (1946-10-01), Waters
patent: 2582541 (1952-01-01), Harrison
patent: 3346435 (1967-10-01), Beck
patent: 3627171 (1971-12-01), Kaplow
patent: 4187768 (1980-02-01), Suzuki
Husar Francis S.
Nilles James E.
Terrell William E.
LandOfFree
Method and apparatus for manufacturing container having bellows does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for manufacturing container having bellows , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for manufacturing container having bellows will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1344402