Special receptacle or package – With pallet feature – Knockdown or collapsible type
Patent
1999-12-30
2000-10-24
Ackun, Jacob K.
Special receptacle or package
With pallet feature
Knockdown or collapsible type
220 16, B65D 1900
Patent
active
06135287&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to collapsible container such as a collapsible pallet container for transport and storage of fluid and particulate bulk goods.
Collapsible containers of the foldable pallet container type, are rather popular since they will make a radical saving of the empty return transport volume possible. Foldable pallet containers are advantageously made of thermoplastic materials which will give light and still sturdy containers which are easy to keep clean. Another advantage is that the tare-weight of such containers is very stable which is not the case with, for example, wood containers where the tare-weight can double when the wood becomes wet. Yet another advantage is that thermoplastic materials do not corrode, which is the case with containers made from metal such as steel and aluminium. Most thermoplastic materials furthermore have a good resistance to chemical substances such as acids and bases, which is not the case with most metals.
A pallet container will have to cope with a vast number of different mechanical strains during its life cycle, and there are some cases where foldable pallet containers of thermoplastic material have not been possible to use due to un-favourable cases of load. One example is handling of fluent and particulate bulk goods since it causes forces and mechanical strain on the container which is difficult to predict, especially in load cases where the container is accelerated, retardated or even more so, when the container is exposed to thrusts and chocks.
Handling of bulk goods is separated from case goods by the fact that it can be poured, pumped or ladled while case goods most often is picked. Mineral water can serve as an example of the differences between the two types of goods. The mineral water could either be supplied in tanks for pumping and pouring which would be regarded as bulk handling, or in bottles or cans, which would be regarded as case handling. As further examples of substances that can be bulk handled can be mentioned, fluid substances with various viscosity, particles, powders, grain, granulate or paste-like substances. Such substances can be further exemplified as chemicals for industrial use, semi-finished and finished products within the food industry, petro-chemical products such as oil, fuels and coal as well as plastic granulate.
Sealing problems between the different parts of the collapsible container will inevitably occur when handling powder, smaller particles and fluids. These sealing problems can be overcome by using a so-called liner which is placed on the inside of the erected container. This liner is advantageously given the shape of a completely closed bag with the same shape as the inner volume of the container. The liner is suitably provided with a filling socket at the upper side and an emptying socket at the lower side. The container must of course also be provided with a hole at the lower end making the emptying socket accessible from the outside.
A container filled with fluid will be exposed to a force, urging the side walls outwards which causes a very unfavourable strain on the parts that normally keeps the side walls together. The fluids, especially low-viscous ones, will move during transport depending on for example acceleration and retardation. This will, in addition to high strains on the parts that keep the side walls together, as well as on the lower hinges, also imply that the container must be provided with a lid which prevents the bag-shaped liner, with content, from "flowing" over the edge of the container. Since the lid will be exposed to forces coming from below it will have to be attached to the container to prevent it from being forced upwards.
If a pallet container, containing fluid, is handled carelessly by being lowered too hasty, or even dropped, the risk becomes great that the parts that keep the side walls together will break due to the forces caused by the inertia of the fluid mass. Such a crash will probably also cause ruptures in the liner so that the contents will start to leak from the c
REFERENCES:
patent: 5501333 (1996-03-01), Swan
patent: 5829595 (1998-11-01), Brown et al.
Ackun Jacob K.
Perstorp AB
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