Canadian Finishing & Coatings Manufacturing - July/August '24 - 16

INDUSTRIAL FINISHING: SURFACE PREPARATION
for abrasive blasting. Prevent blast media from exiting the
enclosure, keeping your shop free of contaminants.
* Blast Cabinets: Metal boxes with openings, windows and
attached gloves, which allow you to use sand or another abrasive
media form to smooth rough surfaces, remove imperfections in
metal and scrape off old paint or rust.
* Portable Blast Pots: Pressurised, tank-like containers, filled
with abrasive material. Allows an adjustable amount of blasting
grit into the main blasting line.
Sanding & Grinding Methods
Sanding and grinding resemble a less aggressive abrasive
blasting. This process requires the surface to be free of
all visible oil, grease, dirt, dust, rust, coating, oxides, mill
scale and other foreign matter when viewed without
magnification.
Grinding can be dry or wet, in which water or another
wetting agent provides a smoother surface to wash away
dust. The purpose of grinding is to remove burrs and
debris on the surface of the substrate and to eliminate the
roughness and unevenness of the coated surface.
Cleaning with power tools provides an adequate
profile for a paint system to adhere to. Painting should be
performed as soon as possible after power tool cleaning or
surface grinding.
Using the right equipment when sanding or grinding
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16
www.cfcm.ca
is especially important because of the increased risk of
dust overtaking your shop. Keeping dust off surrounding
surfaces promotes cleaner paint jobs and protects your
employees from breathing in unhealthy air.
Sanding and grinding can be safely and effectively
performed in dust collection booths that are engineered
to capture dusty air, filter it, and recirculate clean air back
out. Most sanding and grinding booths also have built-in
lighting, giving workers better visibility of the products
they are pretreating and saving on energy costs.
Global Finishing Solutions' sanding and grinding booths
provide a safe, effective way for manufacturers to contain
dust. Air is pulled into the dust collection module with the
help of a direct-drive fan and motor, then passes through
a high-efficiency cartridge filtration system featuring
MERV 13-rated redundant filters. This allows the air
to be cleaned before it is exhausted back into the shop.
The module essentially functions as a vacuum and an air
purifier for manufacturers needing to contain dust.
Clean metal alone may not produce the superior
performance and weathering characteristics desired for
your product. Surface preparation enables your coating to
better bond to the metal and withstand exterior weathering,
in addition to preventing flash rust prior to coating.
Mark Freels is a metal finishing expert and sales engineer
with Global Finishing Solutions LLC.
http://www.sames.com http://www.cfcm.ca
Canadian Finishing & Coatings Manufacturing - July/August '24

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