Donaldson Torit® dust collectors are in hundreds of thermal spray applications worldwide. Our advanced Ultra-Web® nanofiber filtration technology is supremely suited for applications involving thermally generated fume, especially when installed in a Donaldson Torit dust collector selected for your application.
Thermal Spray or Metalizing is a group of coating processes which deposits finely divided metallic or non-metallic materials in a molten or semi-molten condition on a surface/substrate to form a coating. The coating material may start out in the form of a powder, ceramic rod, wires, or even molten materials. The process has the potential to generate very small particulate often referred to as “fume”. This thermally generated fume can be smaller than one micron in diameter, and uniform in size making collection a challenge.
Donaldson Torit® advanced-technology cartridge dust collectors and a variety of filter media that conquer the challenges of most types of industrial dusts, including pharmaceutical, chemical, grain, bulk/powder, food, metal and others.
The best-in-class Downflo® Evolution (DFE) dust collector is capable of reducing equipment size and number of required filters by up to 40% compared to a typical cartridge collector.
The high performance Downflo® Oval (DFO) family of dust collectors provides up to 25% more filtration capacity than other same-sized cartridge collectors.
Torit® PowerCore® dust collection technology use proprietary Ultra-Web nanofiber technology, which allows for a smaller, more efficient filter, reducing the overall footprint of the dust collector.
Designed for thermally generated dust with a footprint up to 65% smaller than most other cartridge collectors.
Thermal Spray Coating Process
Powder Feedstock -> Powder Particle Melting (Gas or Electric Heating) -> Molten Particle Acceleration -> Particle / Substrate Impact -> Coating
Processes Involving Thermal Spray
The thermal spray processes involves such heat that the process produces a very fine dust (fume), typically sub micron in size and very uniform. Some of the materials used in thermal spray applications have associated adverse health effects, and defined minimum exposure limits set for them, which necessitates effective dust collection.
Following are terms for typical thermal spray processes that produce fumes needing to be controlled:
Related Processes Producing Contaminants—Surface Preparation and Finishing Operations
Many metal fume dusts are combustible and those operations generating or handling metal fumes can require special mitigation efforts to minimize fire and explosion risks. Standards such as NFPA 654 can provide guidance for those who generate and handle these types of dusts. See the Donaldson Dust Collectors and Combustible Dust Strategies brochure.
Metal fume dusts may also have identified adverse health impacts, and special mitigation strategies may be required to limit occupational exposure below levels OSHA or other health organizations have established for these materials.