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Decoding Coil Coatings: Basics to Applications

SpecialChem – Sep 13, 2018

Efficient Method to Coat Metal - Coil Coating The coil coating process has been around for several years now! It allows companies to produce durable and attractive products.

Following its slogan “Finish first – fabricate later!”, the process enables manufacturers a way to paint the metal while it is still in sheet form.

The first coil coating line was installed in mid to late 1930’s by Joseph Hunter, the founder of Hunter Engineering. He used this method to paint venetian blinds as part of a continuous strip. After that, Hunter Engineering went on to design and build additional coil coating lines. It was eventually acquired by FATA S.p.a, the Italian global engineering company that is credited with building coating lines throughout the world.

Today, coil coating process presents several opportunities for the world's coating companies. The coil coating process is like those giant printing presses that produce the evening newspaper. The process doesn't stop, it runs at a constant speed and coils of metal are continuously spliced together so that the moving web is of unlimited length.


What is Coil Coatings Process?


According to EN-10169:2012-06, the coil coating process is a method of applying an organic coating material on rolled metal strip substrate in a continuous process. This process includes:

  • Unwinding the coil and cleaning, if necessary
  • Chemical pre-treatment of metal surface (either one side or two side), and
  • Single or multiple application of (liquid) paints or coating powders which are subsequently cured or laminated with plastic films
  • Cooling and rewinding the same coil for shipment to a sheeter, a slitter or a fabricator

All coil coating lines from the oldest and most basic line to the newest and most modern line have a number of common steps or processes.

A basic principle of coil coated material is that: the material travels through the various process sections in a
continuous manner without ever stopping or changing speed!

As a result, the material being coated has extremely consistent properties.

Besides the obvious labor efficiencies, environmental benefits and energy savings; coil coated material is inherently more consistent than those products produced on a part by part basis.

Coil Coating Process 
Source: NCCA


The coated surface can have a wide range of colors, gloss levels and surface textures. The choice of coating depends on the end use if the finished product such as coating with non-stick properties, great flexibility or high chemical resistance.


Substrates in Coil Coating Line – Entry to Exit


A typical organic coil coating line consists of decoilers, entry strip accumulator, cleaning, chemical pretreatment, primer coat application, curing, final coat application, curing, exit accumulator and recoilers.

Coil-coating lines vary greatly in size, with rated outputs between:
  • 3,000 tons per annum and 200,000 tons per annum of coated metal,
  • maximum widths from 150mm to over 2500mm and
  • speeds from 20 meters per minute to 200 meters per minute

Parameter  Value 
Operating speeds (m/min)  20 - 200 
Gauge (mm)  0.1 - 3.0 
Width (mm)  150 - > 2500 
Coating thickness (microns, each side)  2 - 200 

Continue reading to learn more about each step in coil coating process in detail as well as key benefits and main applications...

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