Dust Free Industrial Duty Bulk Bag Unloaders

Discover truly DUST FREE Bulk Bag Unloader Technology.

Safer, cleaner, and proven bulk bag discharge—engineered for tough powders, granules, and pellets.

The manufacturing process of foods, pharmaceuticals, chemicals, and other products often involves unloading raw material from bulks bags. The bulk bag unloading process often involves lumpy or densified material, material it extremely difficult to dispense. This often leads to plant operators attempting to manually extract the material from super sacks by shaking or hitting the bags, creating dust clouds and potentially putting the operators at risk. All of this can lead to disruptions in the manufacturing process, eventually hurting your bottom line.

CMT's Super Sack Unloader is designed to optimize the bulk bag discharging process by implementing various agitation methods while containing ambient dust in the Contain-It™ Chamber. Our Premier Bulk Bag Unloaders offers dust-free bulk bag dispensing with guaranteed discharge of virtually any material. Our Super Sack Unloaders are offered in 3 Main Models: Short-Frame Model, Hoist-and-Trolley Model, and the Fork-Truck Loaded Model. There are two main types of agitation for increasing material flow: Massage-It™ Paddle Agitation (Ultra Heavy-Duty Pipe Agitators that move material into the Critical Flow Path) and Shape-It™ Vibration System (Shapes the Bulk Bag to the Steep Sloped Platform). Each Bulk Bag Dispenser model can be custom designed to fit your plant, and with your choice of features.

HOW TO ACHEIVE TRUE DUST CONTROL - CLICK HERE TO READ THE WHITEPAPER

An intelligently designed unloader built to improve upon the most common bulk bag unloader issues seen in the field.

Industry‑leading dust control with our Contain‑It™ Access Chamber that protects operators and contains inevitable spills. Ask a sales engineer to walk you through our "design issues" package, so you can see the differences.
Guaranteed discharge across a wide range of materials with three targeted agitation methods: Shape‑It™ (vertical vibration), Massage‑It™ (dual paddles), and optional Push‑It™ upper paddles for difficult, compacted bags.
Flexible, turnkey integration to your downstream process—feeding, weighing, pneumatic or mechanical conveying, mixing, and more.
Controls that scale from standard Allen‑Bradley PLC + Rockwell HMI to CompactLogix/ControlLogix for full system control.
Proving ground included: test your exact material and configuration in our state‑of‑the‑art Charlotte facility—on video, live stream, or in person.

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LOADING METHODS

Fork Truck Loaded

Short frame

Hoist & Trolley Loaded

Contain‑It™: Dust Control That Starts at the Source

Most “access doors” are really just parts of a hopper—leading to spills the moment the door opens. Contain‑It™ is a dedicated, spacious access chamber that:

Keeps operators protected and clear of transient dust while the door is open.
Never doubles as storage—so spilled material stays contained, not in your process or plant air.
Provides generous working room to untie, clamp, and re‑tie spouts safely.

Dust collection ready: integrate our Vac‑It™ valve so dust collection runs only when the chamber is open. (Typical requirement: 350 CFM.)

Six Levels of Mechanical Dust Containment

Choose the sealing method that fits your product and housekeeping standard:

Sealed Bag on Shaping Platform – stable, dust‑tight base.
Tube‑It™ – the spout sits inside a reduced‑diameter discharge tube for a simple, robust seal (no moving parts).
Seal‑It™ – greater sealing surface area for improved dust control versus Tube‑It™.
Clamp‑It™ – pneumatically clamps the spout to the tube for total containment (best).
Close‑It™ – UHMW concentric slide valve for flow control and on‑demand bag closure/re‑tie.
Vac‑It™ / Collapse‑It™ – dust collection + empty‑bag evacuation/deflation (Collapse‑It™ requires Clamp‑It™).

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Agitation That Matches Your Material

Shape‑It™ (Vertical Vibration) — shapes compacted, flat‑bottom bags to a steep‑slope platform before opening; then cycles as needed for discharge. Highest dust control; no moving parts in the seal zone.
Massage‑It™ (Dual Paddles) — heavy‑duty pipe agitators pivot up to 90° to break compaction, move material from bag corners to center, and keep flow consistent.
Push‑It™ (Upper Paddles) — optional upper paddles above Shape‑It™ or Massage‑It™ for hard‑to‑move materials (e.g., wet sand‑type products).

Guarantee: We recommend the proper agitation method(s) for your material and stand behind discharge performance.

Shape-It Vertical Vibration

Heavy Duty Massage-It Paddles

Avoid These Common Unloader Pitfalls

Bottom‑mounted massagers that shake the whole bag free can break bag and spout seals, releasing dust.
External, uncontained clamps create massive spills if anything goes wrong—always clamp inside a containment chamber.
Undersized access doors make untying/re‑tying hard and can’t contain normal spillages.

Our Contain‑It™ + Shape‑It™/Massage‑It™ architecture is Better by Design™ to eliminate these risks.

Controls & Automation

Standard: Allen‑Bradley PLC with Rockwell HMI touchscreen.
Options: CompactLogix / ControlLogix, integrated batching, interlocks, and full system orchestration (NEMA 4/4X/7/9 and purged panel options).
Field‑expandable features—add functions later without replacing the panel.

System Integration Options

We’re both a manufacturer and integrator. Pair your unloader with:

Feeders: volumetric, gravimetric (LIW/GIW), screw, vibratory, rotary.
Conveying: dilute/dense phase pneumatic (vacuum/pressure/venturi) and mechanical (flex screw, tubular, belt, drag, bucket, aeromechanical, vibratory).
Dust collection: cartridges/bags, detectors, level controls, flow aids; chamber‑mounted or stand‑alone collectors.
Downstream processes: weigh‑mix‑convey‑feed cells, crusher/breakers, day bins, mixers, extruder refills, filter receivers, cyclones.

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Empty Bag Handling: Cleaner Floors, Fewer Trips

Compact‑It™ constant‑tension compactor:

Compacts 6–10 empty bulk bags into one tight roll; pallet holds 72–120 bags.
Reduces waste removal by up to 75% and fork‑truck traffic.
Ergonomic loading; no hydraulics.

Bale‑It™ automatic balers (for high‑rate operations):

Automatic pull‑in + wire‑wrapped bale output; up to ~1,000 bags/hour.
Great for paper/plastic/cardboard/film/fabric and more.

Visit Our Charlotte Test Lab

Bring your most challenging powders. We’ll set up the exact equipment configuration you’re considering and demonstrate:

Dust‑tight performance with your material.
The right agitation + sealing stack‑up.
Feeding (batch/GIW/LIW) and conveying hand‑offs.

Satisfaction guarantee: if you’re not 100% satisfied with the test visit, we cover your travel.

“Due to new OSHA standards we had no choice but to replace our existing bulk bag unloading equipment at our six US facilities. We tested at 9 different bulk bag unloading suppliers to ensure we made the best decision in this upgrade. After all this evaluation I can say that CMT truly offers the most dust-tight unloader in the industry. In fact, they are the only supplier that had zero design flaws”. — Major CMT Client

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Specifications & Options (Typical)

Frames: industrial‑duty, fork‑lift pockets/hoist options; standard and low‑headroom designs.
Spouts: 8"–16" standard discharge tubes; XL/XXL to 24" available.
Dust collection: chamber‑mounted or stand‑alone; Vac‑It™ valve interlocked with door; Collapse‑It™ for empty‑bag evacuation.
Seals: Tube‑It™ / Seal‑It™ / Clamp‑It™ stacks; Close‑It™ valve for flow control and re‑tie.
Controls: AB PLC + HMI standard; recipe management; batch/continuous modes; I/O for plant DCS/MES.
Materials/Finishes: powder‑coated carbon steel and stainless options for food/chemical environments.
Safety: interlocked doors, guarded pinch points, e‑stops, purge options (NEMA 7/9) for hazardous areas.

FAQ

How do I know which agitation method I need?
We’ll evaluate your material properties (bulk density, cohesiveness, moisture, particle size) and—ideally—test in our lab to recommend Shape‑It™, Massage‑It™, Push‑It™, or a combination.

Can I re‑tie partially emptied bags?
Yes. Use Close‑It™ to close the spout concentrically, then re‑tie within the Contain‑It™ chamber—no dust releases.

Do I need a dedicated dust collector?
It depends on your housekeeping standard and product. Many systems tie into plant dust collection via Vac‑It™; we can also provide chamber‑mounted or stand‑alone collectors. (Typical chamber draw ~350 CFM.)

What if my bags and spouts vary?
Our sealing stack (Tube‑It™ / Seal‑It™ / Clamp‑It™) accommodates a range of spout diameters and tie styles. We’ll validate fit during engineering/testing.