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Liquid dip coating

Parts conveying in dip painting
Two systems are usually designed to transport parts in the dip painting process:
• indexed
• continuous
Indexing systems use an overhead rail transport conveyor or programmable hoists to transfer workpieces to and from a series of immersion tanks matched exactly to the maximum size of the part to minimize paint volume. Due to the time spent in the paint tub (usually 1-3 minutes) and the time for moving and lifting parts, these systems are generally limited to about 20 loads per hour.
Square is usually cheaper than programmable hoists, but has limited process flexibility; all tanks are filled with details at the same time and no operations can be omitted
Passage baths are used for higher production speeds and simply use vertical arches on a constantly moving suspended conveyor to immerse parts.
The advantage of this type of tanks is simplicity; the disadvantage is the tank size; the higher the line speed, the greater the tank capacity to reach the required immersion time.

 

Surface preparation before dipping

Surface preparation prior to dip painting is similar to other painting processes and depends on the required paint performance and compatibility with the paint coating.

Spray or immersion cleaning can be used, but most often both types of operations should be used, because the internal surfaces of parts that may not be cleaned by spray cleaning may have residues that could eventually contaminate the paint container.

In many cases, it is not necessary to dry the details after surface preparation and you can go to the painting process from time to time.