Receptacles – Receptacle having flexible – removable inner liner – Means for venting air trapped between the liner and its...
Patent
1994-02-15
1996-07-23
Castellano, Stephen J.
Receptacles
Receptacle having flexible, removable inner liner
Means for venting air trapped between the liner and its...
53449, 220 861, 220652, 220461, 220676, B65D 9004
Patent
active
055381553
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a container for bulk material, which container comprises a box or bag provided with side walls and a bottom, as well as an insert of flexible material which has corresponding side walls, in such a way that in the peripheral direction of the side walls the insert fits inside the box or bag, which insert has stabilizing connecting elements fixed to its side walls for preventing them from bulging out under the influence of the bulk material.
Such a flexible container is known from GB-A-2,185,732. It is used for packing all kinds of bulk material, and can have a volume of up to one or more cubic meters. For the transportation of such containers it is desirable for them to be a block or cube shape. In that state they can be transported as economically as possible. If the pressure of the bulk material causes the containers to become more or less rounded in shape, some of the available transport space is in fact lost.
This known container has the disadvantage that, as a result of the compartmenting of the interior space through the cross-shaped insert, it cannot be filled completely in a simple way. As soon as one of the compartments determined by the insert is full, bridging can occur in the bulk material, and can block the filling aperture, with the result that the remaining compartments are completely or partially empty.
The object of the invention is therefore to provide a container of the type described above which is provided with efficient internal stabilisation means for retaining the block shape, and which can still be filled reliably. According to the invention, this is achieved in that a tubular core of flexible material is provided, to which core the connecting elements are fixed, and in that the insert has a filling aperture in such a way that during filling of the container the bulk material collects initially in the core and said bulk material presses the flexible material of the core radially outwards and pulls it taut to a cylinder shape.
As soon as the core is filled, it forms a stable cylinder, under the influence of radially outward directed pressure of the bulk material.
The core can be a ring or pipe of flexible material, on the outside of which continuous strips, or strip elements which are vertically spaced, of flexible material run vertically. The whole insert, including the stabilisation means can be folded up to a small packet, which facilitates transportation to the filling place.
The stabilisation means according to the invention preferably support the insert between its vertical edges. This ensures that the bulges of those side walls outwards remain very limited, or do not occur at all.
The interior of the container is divided into five parts by the strips of flexible material and the thin-walled core. In order to ensure that bridging cannot occur in any of these parts during filling or emptying of the container, these five regions can have approximately the same surface areas. Each of the surface areas is large enough to avoid bridging in the bulk material.
The container can be emptied in a simple way if the insert has a bottom wall with an emptying aperture situated below the core, in line with a corresponding aperture in the container wall.
Due to the fact that the horizontal measurement of the strips is approximately equal to the distance of the cylinder wall filled with the bulk material from the side walls of the container, the block shape of the container can still be retained well, despite the outward bulk material pressure exerted on the side walls. For a further description of this method of filling the container, reference is made to U.S. Pat. No. 9,100,318, which is not a prior publication.
The strips preferably comprise two interconnected layers, in such a way that one layer of a pair is always connected to an adjacent side wall half of the insert. If in this case the two layers from each strip are connected to each other near their attachment point to the core, the layers and side walls of the insert can be formed from one web of flexible materi
REFERENCES:
patent: 3871521 (1975-03-01), Szatkowski
patent: 3949901 (1976-04-01), Tokita
patent: 3982653 (1976-09-01), Becker
patent: 4390051 (1983-06-01), Cuthbertson
patent: 4597102 (1986-06-01), Nattrass
patent: 4901885 (1990-02-01), Boots
patent: 5282544 (1994-02-01), Boots
patent: 5287985 (1994-02-01), Hatayama
patent: 5289937 (1994-03-01), Boots
Castellano Stephen J.
Koninklijke Emballage Industrie Van Leer B.V.
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