Stock material or miscellaneous articles – Hollow or container type article – Paper containing
Patent
1993-09-22
1996-05-14
Gibson, Sharon
Stock material or miscellaneous articles
Hollow or container type article
Paper containing
428 364, 428 365, 428 76, 428218, 383 1, 383113, 220453, 220454, 220457, 427233, 2065247, B65D 8584, B65D 9004, B65D 3008, B29D 2300
Patent
active
055165621
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to containers, in particular to containers suitable for storing hazardous substances such as liquid or gel concentrates, and to their production.
At present most hazardous liquids are stored in metal drums or, where smaller quantities are required, plastics containers. Such plastics containers clearly have to be made from a material which is impermeable and resistant to the liquid to be stored but also have to be made sufficiently thick to withstand mechanical shocks which frequently occur during transport, storage and use.
Once the contents have been used, however, it is necessary to dispose of the container and while traditionally such containers would be disposed of by burning or dumping, this is becoming increasingly difficult because many of the plastics used are not bio-degradable and can give off noxious fumes when burnt. For these reasons the use and manner of disposal of certain plastics such as polypropylene and PVC is being restricted in many countries.
An important aim of the present invention is to provide containers adapted to contain agrochemical products, that is to say chemical products for use in agriculture, particularly pesticides, and more particularly such products in the solid, liquid or gel state.
In fact, the storage, transport and manipulation of agrochemical products gives rise to particular problems and difficulties, firstly because agricultural workers do not always take particular care or take routine precautions in the use of such chemicals and secondly because it is particularly necessary to protect the environment. Thus, in this area, there is a very particular need for containers which are carefully adapted for their intended use. Furthermore, when the agrochemical products are fluid, in particular when they are in the liquid or gel form (and more particularly as liquids) the risk of leakage is substantially greater and it is more than ever necessary to take steps to prevent possible pollution.
According to the present invention there is provided a container comprising a moulded outer shell made from a compressed fibre material having an associated barrier comprising a water soluble or water dispersible polymeric material which is resistant to its intended contents. According to a further feature of the present invention there is provided a container comprising a moulded outer shell made from a compressed fibre material, the material comprising a water soluble or water dispersible polymeric material to render it resistant to its intended contents and/or the shell having at least its inner surface provided with a closely adherent coating comprising a water soluble or water dispersible polymeric material which is resistant to its intended contents. According to a preferred feature of the present invention there is provided a container comprising a moulded outer shell made from a compressed fibre material having its inner surface provided with a closely adherent coating comprising a water soluble or water dispersible polymeric material which is resistant to its intended contents.
The fibre outer shell is shock-absorbent to protect the contents of the container against mechanical shocks. It also acts to some extent as a temperature insulator thus preventing sudden changes in the temperature of the surroundings being transmitted quickly to the contents. This can be important because sudden temperature changes degrade some substances. The presence of the supportive and protective container outer means that the water soluble or water dispersible polymeric material need not provide support so that there is less plastic to dispose of than in the all-plastics containers formerly used.
When the compressed fibre material comprises polymeric material the polymeric material may, for example, be substantially uniformly distributed throughout the compressed fibre material or may be present in the surface layers thereof as a result of absorption into the fibre material, e.g. if the container is dipped into a solution of the polymeric material. A container comp
REFERENCES:
patent: 4927038 (1990-05-01), Roebuck
patent: 4981730 (1991-01-01), Zaleski
patent: 5199795 (1993-04-01), Russo et al.
patent: 5219504 (1993-06-01), Insley
Aldred Alan J.
Edwards David B.
Gibson Sharon
Rhone-Poulenc Agriculture Ltd.
Shelborne Kathryne E.
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