a Paint finish can be successfully applied, the
surface of the item to be painted should be clean
and meticulously free from any type of oil or
remove this contamination from the product it
is usual for metal products to be 'Pre-Treated'
prior to either a Paint or a Powder coating being
has additional importance when Powder Coatings
are to be applied to a product.
Powder coatings exhibit higher cohesion properties
and lower adhesion properties than Wet paints,
the coating tends to be tougher than with Wet
Paint systems but its adhesion to the product
tends to be lower.
therefore the metal surface should be prepared
chemically so that it presents an ideal 'key'
for the powder to successfully adhere.
RDM Aqueous Combined Degrease/Phosphate Plants
are ideally suited to 'Pre Treating' metal products,
with the degrease chemicals removing any oils
and the phosphate chemical providing the chemical
reaction to provide an ideal surface key.
The vast majority of contemporary RDM Pre-treatment systems utilise the designs
shown. The product is hung from a motorised conveyer which conveys it through
typically a large robust Tunnel arrangement. The Tunnel comprises of a series
of zones or Stages each with a different function.
On Line Plant Schematic Layout
Plant Plant Schematic Layout
on the above image to download the
Conveyorised Pretreatment Plant Brochure
Click on the above image to download the
Dip Tank Pretreatment Plant Brochure
Inlet and Outlet Vestibule Zones ensure that as Products enter or leave the Plant,
the Sprayed Aqueous solution does not escape. The Heated Zones comprise of a holding
tank beneath the Plant. This tank is Heated by means of a fuel burner or steam.
The Hot Solution or Water is drawn from the tank by a pump and fed to a precisely
spaced set of spray nozzles around the product. As the product passes through
the Fine Spray it is cleaned, phosphated or rinsed. The liquid runs back into
the tank for recirculation and filtration. Drain zones between the Stages reduce
the risk of cross contamination. Following Aqueous Pre treatment, products usually
pass through a forced hot air recirculation dry off Oven. This system requires
a minimum amount of operator input and so it is ideally suited to conveyorisation
free of Hazardous Chlorinated Solvents, C.f C.s or
Both mechanical (spray) and chemical cleaning actions.
Minimal effluent Treatment requirement with Iron Phosphate.
Minimal Health & Safety hazards.
Minimal operator labour input required.
Choices of Dipping or Spraying application, Iron or
Zinc Phosphating Solutions, Separated Cleaning and
Phosphating Zones or Combined Chemical Zones.
Hot or cold final rinses.
Ideal for medium to high volume cleaning operations.
Immersed Tube Heating systems available
fabricated from robust mild or stainless steel plate
of double welded construction.
Powerful Steam Extraction System on Inlet and Outlet
Automatic ball valve water filler with direct 'quick
fill' pipework connection.
Circulating pumps of iron construction with stainless
ABS Copolymer spray pipes with removable 'vee' jet nozzles.
Optional Automatic Chemical Dosing System, drain off
Pump System and fully programmable controllers.
Superb quality RDM matching Dry-off Ovens are available
Gas controls to current Gas Board specifications.
Heated sections insulated with Rockwool insulation.
Fully comprehensive control panel. Choice of Gas, Oil,
Electric or Steam Heating.