What is the Core Process of a Continuous Carbonization Furnace?

A continuous carbonization furnace is a highly efficient, eco-friendly, and intelligent industrial pyrolysis device designed specifically for large-scale, continuous production. SUNYGROUP’s continuous carbonization furnaces are primarily utilized for the carbonization and paint removal of aluminum beverage cans. The furnace operates primarily through high-temperature pyrolysis, thermally decomposing paint films to achieve effective paint removal. It is capable of operating continuously—24 hours a day, 7 days a week—without interruption.

The core process of the continuous carbonization furnace consists mainly of the following two stages:

1. High-Temperature Decomposition

In an oxygen-deficient or low-oxygen environment, the temperature inside the kiln is precisely controlled within the range of 450°C to 600°C (a temperature higher than the pyrolysis point of paint but lower than the melting point of aluminum, which is 660°C). At this temperature, organic coatings—such as paint and ink—on the surface of the aluminum cans decompose (pyrolyze) into combustible gases and a small amount of residual carbon (carbonized residue).

2. Mechanical Stripping

The rotation of the kiln body causes the internal aluminum can fragments to continuously tumble and cascade, generating a dynamic agitation effect. During this process of rotation and tumbling—driven by the combined forces of centrifugal force and gravity—the paint layers, which have become brittle due to carbonization, are mechanically stripped away from the aluminum substrate surface by the constant agitation.

The complete continuous carbonization furnace system comprises a smoke purification system (scrubbers and filters), a paint and plastic removal system (the furnace body, feeder, and discharge conveyor), and a control system (electrical control cabinet). The entire process is capable of fully automated production and operation. If you are interested in purchasing a continuous carbonization furnace, please contact us at: sale.sunycycle@gmail.com