In-Line Paint Stripping Of Hooks
Paola Zavattoni and Casale Litta, Condoroil Chemical, Varese, Italy
Track: VALUE-ADDED PROCESSES - Paint
ABSTRACT --- One critical operation of paint stripping is the treatment of
hooks and carries used to hold pieces in continuous painting lines. By the cycles
following, they obviously accumulate different paint layers, which must be
periodically removed. Particularly critical is the condition of the electrostatic
painting lines, where paint accumulation causes a progressive electric insulation
and the fall-down of the conductivity: thus the piece does not charge anymore,
and it is not properly painted. Usually the hooks are periodically removed from
the line, replaced by clean ones, and then paint stripped before being used again.
Such an operation is expensive, since it requires dedicated personnel to replace
and treat the hooks. In view of these problems, Condoroil studied and developed
a system to be placed in the production line that could work continuously, with
no periodical interventions and with no need to reduce painting line speed.
Products used for this purpose are the most innovative in the field of
environmentally-friendly products, and replace the traditional toxic, chlorinated
solvents, and phenol-based products. Moreover, a mechanical action accelerates
the paint stripping process, allowing reduced treatment times, and consequently,
the plant dimension and length. Mechanical actions can be agitation, ultrasonics,
spray, or any other physical type of removal. Conclusions: No more personnel
involved in unloading hooks; always achieving perfectly clean hooks;
environmentally-friendly paint strippers; savings in manpower; and, in the case
of powder paint, saving up to 5 to 8 percent of powder.
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