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Cartridge Dust Collector
Product Description:
A cartridge dust collector is an industrial dust collector that removes dust from air by drawing it across the outside of pleated filter cartridges and returning the cleaned air from the cartridge bore. Dust is held on the outer face of the media and falls into a hopper below; a reverse pulse of compressed air, released into the bore, detaches the accumulated cake when resistance rises. KingWo builds the collector in three air paths — cross-flow, down-flow and up-flow — with cartridges loaded from a side door, a top access or an inclined magazine. It is sized against the dust extraction air volume of the machine it serves, a span running from 2,200 m³/h on a Q326 tumble belt unit to 38,000 m³/h on the largest roller conveyor machine; duties beyond that span are confirmed per project rather than quoted from a list. It handles dry, non-sticky dust. It is not a wet scrubber, and it does not remove gases.
How a Cartridge Dust Collector Works
Dust-laden air enters below the media. Air from the pickup point is drawn into the dirty-air plenum, passes an inlet distributor and spreads across the outer face of the cartridges. The distributor matters more than it looks: without it the first row of cartridges takes the dust load and the last row runs almost clean, so the filter area you paid for is only partly used.
The cake does the fine filtering. Coarse particles are stopped by the pleat surface within the first minutes of operation and build a cake; from then on it is the cake, not the bare media, that captures the sub-micron fraction. This is why a collector that is cleaned too aggressively runs dirtier than one that is cleaned on resistance — the cake is part of the filter.
Cleaning runs against the filtration direction. When differential pressure reaches the set point, a diaphragm valve releases compressed air into the cartridge bore. The air travels outward through the media, the pleats flex, and the cake spalls off into the hopper. Cleaning air must be dry and oil-free; moisture in the pulse line blinds cartridges faster than any dust will.
Dust leaves through the hopper. Discharge is by rotary airlock for continuous duty or by a manual bin where the load is intermittent. The airlock is also what keeps the hopper under negative pressure — a leaking airlock re-entrains dust at the outlet and shows up as a dusty stack, not as a filtration fault.
Three Air Paths: Cross-Flow, Down-Flow and Up-Flow
The variants that appear under different names on the market differ in where the air goes across the media, not in the media itself. Choose by where the dust has to end up.
Cross-flow — side loading, no headroom needed. Air enters low on one side, crosses the cartridges horizontally and leaves high on the opposite side. Cartridges sit horizontally or at an incline in the side wall and are changed through a sealed side door, so the collector needs no space above it and no one has to enter the dirty chamber. On the inclined version the pleat face sits at an angle, and dust that would otherwise rest on top of a horizontal cartridge slides down into the hopper — this is the reason to specify the incline, and it is worth more than any of the other differences between these two variants. Cross-flow suits medium and low air volumes in workshops with a low roof, and it is the layout used for point-source dedusting where a duct network would cost more than the collector.
Down-flow — dust travels with the air. Air enters at the top, moves down the outside of vertical cartridges and leaves at the side or the bottom. Because the gas is already moving downward, the dust it releases is carried into the hopper instead of being held against the media, and the loading that reaches the pleats is lower for the same dust concentration. This is the layout for high dust loading and large air volumes, and for whole-workshop extraction rather than single pickup points. Cartridges are vertical and are serviced from the top or the side.
Up-flow — smallest footprint. Air enters low and rises through vertical cartridges. The housing is compact and the ductwork can leave from the top, which is why this layout is used where floor space is the constraint. The trade-off is real: with an upward gas path the separated dust falls against the flow, so the inlet distributor has to be designed for it, otherwise the lower pleats load first and the cartridge is spent while its upper half is still clean.
A note on names: side-mounted, side-insert, magazine, inclined and vertical are descriptions of loading and element attitude, not of filtration principle. Two collectors with different names and the same air path will perform the same duty, and two with the same name and different air paths will not.
Filter Media, Pulse Cleaning and Off-Line Compartments
Media is chosen against gas temperature and dust chemistry, not against element shape. Polyester is the default for ambient and warm gas; PPS where the gas runs hotter; a PTFE membrane where the dust is fine, hygroscopic or sticky enough to sit in the pleat rather than release from it; antistatic where the dust is combustible or the gas carries a charge. The temperature ceiling is a property of the medium, not of the collector, and the figure that applies to your duty is fixed on the data sheet at order.
Cleaning is by pulse jet, and where the unit is divided into compartments it can be run off-line: one compartment is isolated from the gas flow while it is cleaned, then returned. Off-line cleaning removes the failure mode that limits on-line pulse cleaning — dust released from one cartridge being carried straight onto its neighbour — and it lets a compartment be serviced without stopping the fan. How many compartments a given unit has determines whether that claim holds in practice; on a two-compartment housing the fan keeps running but the spare capacity is thin.
Sealing is the other half of filtration. Every joint on the clean side — cartridge seat, tube sheet, access door — is a path for dust that has already been counted as removed. The side-door variants use a spring tension seat so a cartridge can be changed from outside the machine without tools, and the housing is checked by kerosene leak test before dispatch.
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Product Description
How to Size a Cartridge Dust Collector
Five inputs settle the selection, and none of them is a model code:
Air volume at each pickup point, and how many points run at once. Points that never run together do not add up.
Dust loading and its nature — metal fume, grinding swarf, sand, wood, oxide scale. Loading sets the cleaning cycle; nature sets the medium.
Gas temperature, at the pickup, not in the workshop.
Particle size and whether the dust is fume. Below roughly a micron, capture at the hood matters more than the filter grade, and the hood is usually the part that gets under-designed.
Available headroom and which side the collector can be serviced from. This decides the air path before any specification does.
Filter velocity — air volume divided by filter area — is what actually sets the size, and it is the number that gets quietly inflated when a quotation is squeezed: too high a velocity gives a smaller, cheaper housing and a cartridge that blinds in months. Across the machines we build, the collector has to cover an extraction volume anywhere from 2,200 m³/h to 38,000 m³/h, so the same housing family is configured up or down rather than picked from a shelf. We state air volume, filter area, cartridge count and fan power on the data sheet issued with the quotation, and we will say which velocity those figures imply.
Where Cartridge Collectors Are Used
Shot blasting and abrasive blasting — booth and room extraction, where the dust is fine, abrasive and continuous.
Grinding and polishing stations — dust collection for grinding, where the collector is often specified with off-line cleaning and an inlet that drops coarse sparks before they reach the media.
Cutting — dust collection for cutting, plasma, laser and abrasive sawing; the three produce different dust and should not be specified from one another.
Welding fume — welding fume extraction, which is a separate product line because fume capture at the arc, not filtration, is the hard part.
Bulk material handling — conveyor transfer points, pneumatic conveying discharge, silo vents. These are single-point sources where a dedicated collector removes the need for a duct network to be designed, fabricated and balanced.
Foundry and sand handling — shakeout, sand reclamation and casting cleaning, usually behind a cyclone pre-separator that takes the coarse load off the cartridges.
What This Collector Does Not Do
Cartridge collectors are sold into conditions they cannot serve, and the resulting failure is blamed on the filter. Four limits are worth stating plainly.
It does not handle wet, sticky or condensing dust. Oil mist, condensate, hygroscopic salt and damp sand blind a pleated medium and cannot be pulsed out. Those duties need a different machine, not a different cartridge.
It does not remove gases or odour. CO, NOx, ozone and metal vapour pass through the medium. Where the process produces them — plasma and laser cutting, welding on coated steel, resin binders in foundry sand — the collector needs a carbon or catalytic stage behind it, and that stage is a separate item of supply.
It is not, in the standard build, an explosion-protection device. Where the dust is combustible the collector has to be specified for that duty from the outset: antistatic media, grounding, explosion venting and a discharge arrangement that does not accumulate. A standard unit wired to a wood dust line is not a compliant installation, whoever supplied it.
It does not replace pre-separation. Where the dust load is coarse and heavy, a cyclone or drop-out box ahead of the cartridges costs less than the cartridges it saves.
Technical Specifications
Q: How long is the lead time?
A: 35–60 days after receipt of order for standard configurations. Non-standard dimensions, oversize housings, export crate packing and peak-season saturation extend that, and are confirmed separately.
Q: What does the quotation include?
A: The collector, the fan, the controls and the wear parts configured for the model. Freight, insurance, duties and third-party inspection are not included.
Q: Is installation included?
A: No. Installation and commissioning are charged at USD 135 per man-day, with overseas travel borne by the buyer. Self-installation is supported with remote guidance and does not affect the warranty.
Q: What is the warranty?
A: 12 months from the final acceptance certificate signed at site, excluding normal wear parts. The warranty is void where damage results from non-original parts or unauthorised modification.
Q: Which certifications do you hold?
A: CE marking covers shot blasting machines, sandblasting machines and dust collectors, valid to 23 September 2030. ISO 9001, ISO 14001 and ISO 45001 are valid to 29 October 2028.
Q: Can the unit be built for our voltage?
A: Yes. The unit is built to the destination standard, and motor selection is confirmed in writing at order.
Q: Can one collector serve a blasting booth and welding stations at the same time?
A: Not recommended. Blasting dust is heavy and abrasive; welding fume is sub-micron and has to be captured at the arc. The two call for different filter velocity, different media and a different hood, and a shared unit runs one of them badly. Welding fume is better served by a dedicated unit.
Q: Can we use filter bags instead of cartridges in the same housing?
A: The side-loading housing can take flat or round bags, but that is a bag filter: different media, different cleaning, and a different basis for filter area. It is quoted as a bag filter and is outside this page. Please state which medium you are pricing.
Q: Can it handle wet, oily or sticky dust?
A: No. Oil mist, condensate, hygroscopic salts and damp sand blind a pleated medium and cannot be pulsed out. That duty needs a different machine type, not a different cartridge.
Q: Do you supply the collector on its own, without a blasting machine?
A: Yes. The collector is supplied on its own, configured against four inputs: air volume, dust nature, gas temperature and the space available for installation.
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