Tuesday, August 5, 2014

How A Bulk Bag Unloader Works


How Does A Bulk Bag Unloader Work?


So you may or may not know that a bulk bag unloader or what is also known as a bulk bag discharger is, it's a sealing device that inflates inside the bottom spout of the bulk bag and seals it during the emptying process to eliminate the risk of dust emissions. It also operates in conjunction with an automatic spout stretching device to promote a smooth and cylindrical path for material flow directly into a process vessel or integral conveyor. This patented feature is particularly valuable when products with poor flow characteristics are being handled.

It is important to ensure total discharge of product from the bulk bag when invasive powder is being unloaded to prevent the escape of material when the emptied bag is removed. For this reason, the Model T9 has bag massagers at the corners of the bag as well as the base. A patented pneumatic bag tensioner and an inner liner clamp prevent creases from forming during unloading which can trap residual material.


Height adjustment for bags of different sizes is provided as well as a lifting frame locator for correct alignment of the discharger with a process vessel or other equipment where the material is being unloaded. This feature enhances product containment.


bulk bag unloader
Bag is placed on unloader by hoist or forklift.

bulk bag unloader
Spout is pulled through the discharge dish with spout closure bars open.
bulk bag unloader
With spout closure bars closed, bag is untied without release of contents. Bag spout located over inflation & tensioning device.

bulk bag unloader
Spout closure bars are opened to release product.

bulk bag unloader
Pneumatic stretching device is actuated to provide a smooth path for product through spout.

bulk bag unloader
Bag massagers at each corner assist material flow & ensure total emptying.

bulk bag unloader
Pneumatic bag tensioner retains bag shape.

The worldwide acceptance of bulk bags has brought about important changes in bulk materials handling practices to the point where even the pharmaceutical industry are using them to replace rigid IBC's. This is because bulk bags and their associated filling and discharge systems offer proven advances in hygiene and high containment operation.

bulk bag unloader image source: www.spiroflowsystems.com

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