Bulk bag dischargers are typically implemented when capacity requirements dictate a change from 50 lb. bulk bags to save labor costs and to minimize dust.  The most crucial aspect in providing you with a successful bulk bag unloader is understanding the bulk bag(s) to be used, your goals and concerns.  Many suppliers overlook the actual bulk bag and dive into offering you their standard bulk bag unloader – the “one size fits all” mentality.  Bulk Bag items of concern include: Dimensions; Lined or Unlined; Loose Liner, Tabbed Liner or Glued Liner Flat Bottom or Cone Bottom; Single Trip or Multi-Trip; Bulk Bag Outlet Spout Dimensions; Bulk Bag coatings, etc.

The key component - minimizing dust - can be a difficult task, although today’s technology makes this possible.

Discharger to Pneumatic Conveying System

FP-HT54 Dust Tight Bulk Bag Unloader with Dilute Phase Conveying System

FP-HT54 Dust Tight Bulk Bag Unloader with Dilute Phase Conveying System

Bulk Bag Discharger with Dense Phase Transporter

Paddle agitation or vibration.  Up front this seems like a simple answer – who wants to vibrate (pack) a cohesive product further?  Paddle agitation seems to be the logical answer.  The real answer lies in understanding both technologies.

Pulsed Vibration
Pulsed vibration is the key to successful bulk bag discharging. When the bulk bag is placed in the unloader, the bottom is generally “rock hard”.  At this stage the operator manually actuates the vibratory, which transmits vertical vibrations, to the bulk bag which shapes it to the bulk bag platform, generally 60-degrees.  This step shapes the bulk bag and allows for easy access to the bulk bag outlet spout.

During discharging vibration can be required. If so, this is pulsed On and Off to keep a standing head of product in the outlet spout.  The vibrator never runs continuously.  Vibration isolation mounts are used to absorb the vibration and ensure it is transmitted to the product only.

Guaranteed discharge with No Moving Parts

Competitor's Paddle Agitation in Bulk Bag Unloader

Competitor’s Paddle Agitation

Bulk Bag is continuously moved, continually breaking any “dust seal”

Vertical Pulsed Vibration for bulk bag unloader

Vertical Pulsed Vibration

Used to shape the bulk bag and intermittently used to discharge product

CMT offers a completely dust-tight access chamber that contains dust within a large, easy to access chamber.  Our pneumatically actuated bulk bag spout clamping system completely seals the bulk bag outlet spout thereby eliminating the most poignant dust leakage potential.

Contact us for a complete project analysis.

Access Chamber Bulk Bag System


Design Issues
Bulk Bag Discharger with Dense Phase Transporter

Bulk Bag Dischargers and Unloaders

Our bulk bag unloaders minimize dusting, as the bag spout is connected to an internal cylinder, located within the isolation chamber. The bulk bag is clamped via air cylinders thereby providing a positive seal between the bag and downstream equipment within the access chamber.
Please notice how LARGE this access chamber is. Compare this to “gull wing” doors and small square enclosures that make it very difficult to access the bag.

Dust Extraction Port – This port is connected to the access chamber, pulling any dust that may be present due to leakage at the bag seams or stitching, which is especially prevalent with unlined bulk bags. This is located far above the material contact area, allowing for positive dust evacuation, as it will never be plugged by material.

Bulk Bag Unloader - Access Chamber

Efficiently Empty Bulk Bags; Quickly Discharge All Material from the Bag and Eliminate Dust

Bulk Bag Discharger to Pneumatic Conveying System Viking SM

Bulk Bag Unloaders, also commonly called bulk bag dischargers, super sack unloaders, super sack dischargers, FIBC dischargers, and FIBC unloaders, provide a safe, dust-free and convenient way to handle and discharge bulk bags. CMT provides Bulk Bag Unloaders that make handling of bags practical and efficient by providing an easy and safe method to lift, support and discharge.  Our bulk bag unloaders eliminate dust and spillage associated with other methods of bulk bag handling. Since CMT specializes in bulk material handling equipment, we build systems that provide controlled, regulated discharge with a variety of feed devices and weight control options.

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Bulk Bag Unloader with Large Dust-Tight Access Chamber

FP-HT54 Bulk Bag Unloader with Large Dust-Tight Access Chamber

Bulk Bag Unloader, with an integral Sack Tipping Station to a Screw Conveyor

Bulk Bag Unloader, with an integral Sack Tipping Station to a Screw Conveyor

bulk bag unloader dust
Bulk Bag Unloader Brochure

General Bulk Bag Unloader Customer Goals

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Fully Welded Bag Shaping Support Platform
Bulk bag unloader dust and spill
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