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PP, PE, HDPE and other non-polar plastics have strong surface inertness. Direct spraying of UV paint is very easy to paint off, shrinkage cavity and poor adhesion.
LPG+compressed air mixed combustion, 1100 〜 1800 ℃ high temperature flame scanning workpiece surface instantaneously:

Burning Remove release agent, oil stain and dust;
High-temperature oxidized plastic surface to generate hydroxyl polar groups;
Improve the surface tension, UV primer and UV varnish can firmly adhere to the plastic shell surface.

>Only the surface is burned, and the workpiece body will not be baked and deformed; It belongs to the pre-process of UV plastic spraying production line standard configuration.

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