What you should know about stamping coated coil - How to maximize ...

Tag : Painting Metal

1. Who Is Using Coated Coil?
More than 4.5 million tons of coated steel and aluminum coil areproduced and delivered to processors in North America each year.Manufacturers in the appliance, automotive, transportation,building construction, office furniture, lighting fixture, andmachinery industries use prepainted metal to manufacture productssuch as ranges, refrigerators, agricultural equipment, heating andcooling units, metal roofs, metal buildings, entry doors, garagedoors, awnings, carports, and beverage cans.
2. How Is the Coil Painted?
Coil coating lines use a continuous process to unroll each coil,clean it, treat it, apply a primer and finish coatings, cure thepaint, and then reroll the coil for shipment for downstreamprocessing. This process applies finishes to coils with widths upto 72 in. at speeds of up to 700 feet per minute. Typically, thefinish is applied to both sides of the substrates (see Figure 4 ).
3. Which Coatings Are Applied?
The basic types of coating chemistries applied to coil includeacrylics, epoxies, fluorocarbons, plastisols, polyesters,siliconized modified polyesters, urethanes, waterborne emulsions,zinc-rich coatings, and treatment and primer combinations.
Acrylics. Acrylics have exceptional flow and film clarity when they arecured, resulting in a very hard, glossy surface that has excellentdirt and stain resistance. They readily accept screen printing,making them highly suitable for screen-printed signs and fortrailer side panels in the truck-trailer industry.
Epoxies. Epoxy-based coatings inherently have exceptional adhesion