One of the most detailed processes in the plant is painting
the vehicles. This area's ultimate objective is to apply all
coatings at the highest level of efficiency with the best
appearance possible. TMMK uses both water-bome and solvent-based
paints.
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The Toyota painting process involves eight basic areas. The
first step in the process is phosphating. This area removes
dirt, grease and other contaminants from the steel body.
A
phosphate coating is also applied to improve corrosion resistance
and adhesion of the primer and top coats.
Electrodeposition
is the second phase. The body is totally immersed into a tank
of electrically-charged primer, permanently bonding the primer
to the steel. The car then goes through a water spray to remove
excess film and then to a dry-off oven.
In the dry sand and sealing area, seam sealer is applied
to prevent corrosion and water leaks.; The body is then taken
through an anti-chip procedure. A coating is applied to the
bottom of the cars, the area that receives most of the gravel
and road damage. An additional coating to prevent corrosion
and noise is also applied.
The fifth stage
is primer surfacer. Here a high solid primer is applied to
smooth out the appearance of the previously applied primers.
The material is then baked at 280 degrees Fahrenheit for 30
minutes. This next process is called wet/sand. Top coat is
the seventh area of painting. The car is then baked at 250
degrees for 30 minutes.
At final inspection,
the painted body is checked for defects. Upon approval, the
cars are shipped by overhead conveyor to the assembly area.
A
phosphate coating is also applied to improve corrosion resistance
and adhesion of the primer and top coats.
applied.
