Working principle of paint stripping machine

Paint stripping machines are not single devices, but rather categorized into various types based on their underlying technologies, each with its own core working principle. They can be mainly divided into several categories: chemical paint strippers, high-temperature pyrolysis (paint stripping furnaces), laser paint stripping, and mechanical peeling (such as shot blasting machines and specialized paint stripping machines).

**Chemical Paint Strippers:** These are liquid chemical reagents that work by chemically penetrating and swelling to remove paint. The stripper quickly penetrates to the interface between the paint film and the substrate, disrupting the molecular structure of the paint layer or causing it to swell and soften, thereby reducing its adhesion. Typically, the coating loosens and peels off within 5-30 minutes, and can then be removed by rinsing or wiping. This method is suitable for various substrates such as metal and wood, and does not damage the surface finish of the substrate.

**High-Temperature Pyrolysis (Paint Stripping Furnaces/Thermal Cleaning Furnaces):** This method utilizes high-temperature pyrolysis technology. The workpiece is fed into the furnace chamber and undergoes thermal decomposition in an oxygen-deficient environment (250-420℃), breaking down organic matter (such as paint) into small-molecule gases. These gases are then completely oxidized in an oxygen-rich secondary combustion chamber (600-900℃), ultimately converting into carbon dioxide and water vapor for emission. This process effectively removes coatings from fixtures and workpiece surfaces without damaging the metal substrate, offering advantages such as high automation, low operating costs, and environmental friendliness.

Laser paint stripping: This is a non-contact, high-precision physical stripping method. Its core principle utilizes the instantaneous thermal effect of a high-energy laser beam:

Vaporization evaporation: Laser energy is absorbed by the paint layer, instantly heating it to its vaporization point, directly converting it into gas and escaping.

Shock wave stripping: High-power pulsed lasers generate plasma shock waves, "shaking" the paint layer off the substrate surface.

Selective absorption: By selecting a specific wavelength (such as 1064nm or the ultraviolet band), the difference in light energy absorption rates between the paint layer and the metal substrate is utilized to remove only the paint layer without damaging the substrate. Ultraviolet lasers can also directly break the molecular bonds of organic materials through photochemical reactions. This method is pollution-free and highly precise, suitable for processing precision components such as mobile phone frames and enameled wires.

Mechanical stripping (e.g., hook-type shot blasting machines, dedicated paint stripping machines):

Shot blasting machine: A high-speed rotating shot blaster propels projectiles (such as steel shot) onto the workpiece surface. The impact and friction of the projectiles physically remove old paint layers and dirt. Suitable for complex-shaped workpieces requiring thorough cleaning, such as hangers. Specialized wire stripping machines (such as enameled wire stripping machines): Designed for fine wires like enameled wire, these machines employ precision mechanical structures (such as rotating blades and high-speed steel wire grinding wheels) combined with adjustable pressure and constant feed to evenly peel off the insulating enamel layer through physical scraping or grinding, avoiding damage to the internal metal conductor.