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Continuous Coil Anodizing

Continuous Coil Anodizing

The advantages of coil anodizing stem from efficient processing and low associated labor costs.

The configuration for a basic continuous coil anodizing line consists of a
coil feed operation, pretreatment and cleaning tanks, post treatment
facility, and coil rewind equipment.

Using pre-anodized coiled aluminum lowers finishing costs, saves production time, and reduces material handling.

Production procedures using pre-anodizing:             
  1. Order pre-anodized aluminum
  2. Fabricate the part
  3. Assemble product
  4. Package for market 
Production procedures using post finishing:
  1. Fabricate the part
  2. Pack and send to anodizer
  3. Unpack and rack
  4. Anodize pieces
  5. Unrack and repack
  6. Receive and unpack
  7. Final assemble
  8. Package for market 

Continuous Coil Anodizing Capabilities


Satin Matte
Post Treatments

Special lubrication 
  Anodized Films - Interior

.00008" (2 microns)
.000125" (3.2 microns)
.000175" (4.4 microns)
Metal Dimensions

Thickness: .002-.090
Width: 1"-60"
Coil I.D.: 3"-20"
Coil Diameter to 72"

.000250" (6.4 microns)
.000350" (8.9 microns)
.000425" (10.8 microns)
.000700" (17.8 microns)
Metal Sizing

Slitting: Widths to 60" to 3/8" wide
Shearing: Widths to 54" to 540" long
Leveling: widths to 48" to 216" long

Spectrum of colors in organic dyes
Fade-resistant colors in earthtones
and black

Paper interleave
Strippable protective film
Standard and special skiding

The advantages of pre-anodized aluminum can be applied to most products that are fabricated from sheet or coil stock. Products that are made from extrusions, castings, rod bar, or plate are limited to piece anodizing processes.

Experienced users of pre-anodized products have learned that raw edges produced by cutting pre-finished stock do not have to be a restrictive feature. Design alterations can most often hide an edge, and because aluminum will seal itself in the presence of oxygen, there is no loss in protection. Leaching or creeping corrosion that occurs with steel products, and flaking that occurs with painted surfaces are not possible with pre-anodized aluminum.

Experience has also taught fabricators of pre-anodized aluminum to make bends gradually. In this way they take advantage of the hard, protective anodized surface without crazing it. Certain metallic finishes that are embossed or etched can help mask this phenomenon as well.

Reprinted with permission of Continuous Coil Anodizers Association.