Products / Plant
Mineral Powder Coating Plant
Ground mineral powder treated with stearic acid so it turns hydrophobic — the difference between a filler that disperses in a polymer and one that clumps.
Specification
Every figure, and where it comes from.
Values are taken from the company's own technical specification and cross-checked against its quotations. Where two documents disagree, both readings and the rule applied are stated in the row.
- Size
- P36 — 36 inAll three brochures
- Finish
- 100% water proofingAll three brochures
- Production
- 28 units per hourAll three brochures
- Coating agent
- Stearic acid, melted and metered inProcess flow, stages 17–19
- Line stages
- Elevator-3 · Hopper-3 · Screw conveyor · Mixer · Screw conveyor · Pulveriser · Elevator-4 · Hopper-4Process flow chart, stages 14–21
The drawing
How it is built, and how it moves.
Drawn on the same drafting system as the rest of the set: five stroke weights by role, a 2 px grid, and motion derived from the machine's own kinematics rather than approximated.
How it works
The principle behind the specification.
What surface modification does
Untreated calcium carbonate is polar and hydrophilic. Loaded into a polymer it absorbs plasticiser, agglomerates, and the agglomerates act as stress concentrators. Stearic acid reacts with the particle surface to leave a layer of calcium stearate: a long non-polar chain pointing outward. Surface energy drops, the particle becomes hydrophobic, and it disperses through the polymer instead of clumping in it.
How the plant does it
Powder is metered into a jacketed vessel by a screw feeder. Stearic acid is melted in an adjacent heated tank and dosed in by a metering pump at under two per cent. A three-tier high-speed impeller holds the whole charge in turbulent suspension so the molten acid is sheared over every particle rather than sitting on the surface of a heap. The pulveriser downstream breaks any agglomerate the coating stage forms.
What it is used for
Coated grades go into PVC, rubber, paint, adhesives, sealants and masterbatch, where moisture resistance and dispersion at high filler loading are what the customer is buying.
In the works
The machine itself.
Photographed at the AEW works. Retouched for exposure and white balance; nothing has been restyled or added.
Elsewhere in the line
What sits either side of it.
Machine · 16 in × 9 in
Jaw Crusher
Single-toggle primary crusher at the head of the line. Reduces run-of-mine rock to a size the elevators and the…
Machine · Reverse pulse jet
RPJ Bag Filter
Collects the product out of the air stream. Cleaned on line, so the plant does not stop for the filter.
Machine · 300 mm, VFD
Rotary Airlock Valve
Discharges collected powder out of the filter hopper without letting air in. A small machine that decides whether the…
Ask about the mineral powder coating plant.
Quote requests, spares enquiries and technical questions all reach the same desk. We answer with a specification, not a brochure.