Receptacles – Receptacle having flexible – removable inner liner – Means for venting air trapped between the liner and its...
Patent
1980-11-26
1983-03-15
Moy, Joseph M.
Receptacles
Receptacle having flexible, removable inner liner
Means for venting air trapped between the liner and its...
206523, 220 84, 220401, 220901, 220902, B65D 9004
Patent
active
043764940
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an insulated tank container, preferably but not exclusively of the type which comprises a framework and which can be transferred between different vehicles etc.
PRIOR ART
Conventional insulated tank containers have such a thick inner body plate that this carries the stresses of the load and any internal excess pressure. In other words, the tank or container is self-supporting and the insulation situated on the outside (with a protective outer skin) has, in principle, no other function than just to insulate. The tank normally rests on its chassis through rigid brackets or so-called saddles.
In some cases, according to current standards, certain external loads are permitted on the insulation. The thickness of the body can thus be reduced somewhat, if blows and shocks from the outside can be damped by the insulation.
For so-called cryotanks, there is also the possibility, according to the standards, of including an outer shell to take up the load, but these tanks are spherical because of the pressure, so that the only additional purpose of the insulation is to hold the shells apart.
A conventional tank container is therefore both heavy and expensive.
THE INVENTION
A considerably lighter and cheaper construction is achieved according to the invention, according to which an insulated tank container consists of a preferably thin inner shell without any demands on carrying capacity and outside this a semi-hard or hard insulation which has the capacity to take up and transfer stresses in various directions and which is firmly glued to or otherwise integrated with the inner shell.
The inner shell (the container) has an arcuate or purely rectangular cross-section to accommodate as large an amount of liquid as possible. The arcuate shape must be selected for liquids which involve hygiene because the washing apparatus used does not reach into corners.
The container walls are exposed by the liquid to forces which are transferred to the insulation in the form of compressive stresses, shear stresses and sometimes moderate tensile stresses, all of which can be taken up and transferred by the semi-hard or hard insulation.
Thus, together, the inner shell and the insulation form a load-bearing unit. The insulation may have a protective layer on the outside.
Another and preferred embodiment is that a preferably load-bearing outer shell is firmly glued to or otherwise integrated with the insulation, the outer shell preferably comprising protective rigid corner strips.
The insulation may essentially consist of preformed, preferably disc-shaped parts glued to the inner and the outer shell.
The inner shell preferably consists of a preshaped container of a material which is suitable in view of the contents, while the outer shell is built up of rigid corner strips and discs of a material without any demands for resistance to the contents of the container, and the preferably disc-shaped insulating parts are glued to said discs before mounting and are glued to the container during the mounting.
After the mounting of the inner shell, the various disc-shaped insulating parts and the outer shell, certain remaining, unfilled spaces remain between the shells. These can be filled with injected insulating material in foamed form, which hardens in situ.
An alternative method of production is to introduce (inject) foam and harden all the insulating material in situ between preformed shells.
Particularly if the inner shell is very thin and therefore lacks the necessary carrying capacity, there may be some kind of contour-retaining elements in the inner shell during manufacture, which are later removed.
The necessary pipes, valves, etc. are mainly disposed in the insulation so that the tank container has a smooth exterior which is an advantage from several points of view.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below with reference to the accompanying drawings in which
FIGS. 1-3 illustrate typical steps in the coming into existance of a tank cont
REFERENCES:
patent: 695618 (1902-03-01), Mack
patent: 2764314 (1956-09-01), Mautner
patent: 3112043 (1963-11-01), Tucker
patent: 3115982 (1963-12-01), Morrison
patent: 3122259 (1964-02-01), Meesen
patent: 3411656 (1968-11-01), Jackson
patent: 3412521 (1968-11-01), Ballman
patent: 3435946 (1969-04-01), Sobek et al.
patent: 3896961 (1975-07-01), Guilhelm et al.
Brown Laurence R.
Dynatrans AB
Elkins Gary E.
Moy Joseph M.
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