The minispangle process aims to minimize ‘spangles’ in galvanized strips in order to improve the surface quality for coating. Fives is a pioneer in the minispangle process, having designed the original Stein Minispangle system, as a companion system to continuous galvanizing strip lines.
Stein minispangle: high quality coating
Fives began developing this technology in 1975 by applying nuclei constitution of the zinc, in the form of powder conveyed by air, to minimize the appearance of ‘spangles’ in galvanized strips. The system is installed downstream of the zinc coating bath and targets two purposes simultaneously: solidification and crystal nuclei deposition. This enables to obtain an extremely fine crystallization of the coating, which produces the high surface quality needed for precoated and color coated strips.
High quality coating
Fives has started to develop this technology more than 40 years ago by applying nuclei constitution of the zinc, in the form of powder conveyed by air, to minimize “spangles” in galvanized strips. The system is installed downstream of the zinc coating bath, with zinc dust minispangle process targeting two purposes at the same time: solidification and crystal nuclei deposition. This allows to obtain an extremely fine crystallization of the coating in order to achieve high surface quality for precoated and color coated strips.
Fives developed several technological improvements to meet increased quality and parameters requirements:
- Multi-slot blowing system for high output CGL (output variations and severe slowdowns)
- Blowing system with slots for high output CGL and improved coating uniformity
- Direct cold air blowing system (compact design and high efficiency)
Range of equipment
|Stein Minispangle 1.0|
|low capacity CGL|
|Stein Minispangle 1.0 movable type||high capacity CGL|
|Stein Minispangle 1.0 precooler||specific conditions, suitable for a limited space cooling tower|
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