Collapsible intermediate bulk container. A collapsible intermediate bulk container for liquid or freely flowable solid materials includes either a fabric outer/film liner bag or a bag of fabric reinforced elastomer. The bag is supported by a collapsible rigid frame which gradually collapses as the bag is emptied. The collapsible rigid frame includes a pallet-base portion that has an upper surface that is sloped to a center drainage point to facilitate complete emptying. The pallet-base portion contains a valve arrangement fixed to either the fabric outer bag (in the film-lined configuration) or to the reinforced fabric bag, at the center drainage point. The collapsed frame provides a compact return package. Either bag configuration may be reused or replaced in whole or in part.
Intermediate bulk containers are used for shipping and storing liquids such as chemicals, beverages, or food products, or freely flowable solids such as grains, livestock feeds, chemicals in powder form, and minerals in powder form. Recent designs for rigid intermediate bulk containers have typically been rectangular in shape. It is desirable to be able to move bulk containers using a fork lift and to stack them to maximize the use of storage and shipping space. To perform this function, many types of bulk containers include pallet-type bases that are compatible with standard fork lifts. Rigid bulk containers present a problem of wasted space in storing or shipping the containers when empty.
The problem of wasted space has been addressed by the development of flexible bag type bulk containers that are well known in the art.
In order to stack flexible bag containers and ensure the stability of a flexible bag container when full and in shipment, it is often desirable to reinforce the container by attaching it to a rigid frame. This is particularly important for storage and shipment of liquid materials. It is also desirable for the rigid frame to be capable of collapsing for transport or storage once the container is empty.
In addition, the collapsible rigid frames require manual separation of components of the frame for collapsing, usually by two people, and this presents the possibility of losing components of the frame. The available collapsible rigid frames must also be set up before the container held by thereby can be filled
A bag-in-bag container for bulk handling of fluent materials, comprising:
a generally rectangular flexible outer liner/bag formed of double wall water impervious internal woven plastic material having four side walls, an open top end, and a bottom wall, the double walls of said side walls secured together at the corners to form open top end pockets;
four generally rectangular rigid wooden stiffener panels, each having a bottom end, a top end and longitudinal lateral sides, and each removably received in a respective said pocket of said outer liner/bag and disposed in a generally vertical orientation, said stiffener panels having a width less than the width of said pockets such that their said lateral sides are spaced a distance apart and are not joined together so as to form non-structural floating corners defined only by the corners of said outer liner;
a flexible generally cubical multiple ply inner bag formed of liquid impervious material disposed inside of said outer liner/bag, said inner bag having four side walls, a top wall, and a bottom wall defining an interior, an internally threaded bung having a bottom flange sealed around an opening in said inner bag top wall, a neck portion disposed above said flange, a passageway in communication with said inner bag interior for permitting fluid passage into or out of said bag interior through said inner bag top wall, seal means at an upper end, and a removable closure member threadedly and sealingly engaged in said passageway; and an internally threaded valve fitment on one side wall of said inner bag near a bottom end for receiving a discharge valve, said valve fitment sealed to said inner bag such that the plies of said inner bag are not penetrated, and a removable closure member threadedly engaged in said valve fitment, said closure member being removed and said plies of said inner bag being penetrated upon subsequent attachment of a dispensing valve having a cutting element for controlled dispensing of fluid from said inner bag.