Corona, plasma or flame treatment before printing?
Corona, atmospheric plasma and flame treatment can prepare suitable plastic surfaces for printing. The choice depends on the surface that must be reached, the material, required treatment coverage and the way the part moves through the machine. Confirm the route with the intended ink and finished-print tests.
Choose from the surface and machine layout
Cleaning, activation and priming have different functions. Cleaning removes material that interferes with bonding. Activation changes the existing surface. A primer adds an intermediate layer compatible with the substrate and ink. An activation process should not be assumed to remove every kind of contamination.
AAE uses corona, plasma and flame pretreatment in its printing applications. A useful comparison includes access to the full print area, product support, exposure at production speed and the behavior of the process during a stop.
| Method | What to examine in an application trial |
|---|---|
| Corona | Electrode arrangement, distance, rotation, coverage and the influence of nearby conductive parts |
| Atmospheric plasma | Nozzle access, treatment width, distance, gas conditions and product temperature |
| Flame | Burner coverage, gas and air settings, product movement, heat input and stop behavior |
Include rotation, edges and waiting time
A favorable measurement at one accessible location does not establish uniform treatment over the print area. Cylindrical parts may need controlled rotation, while shoulders and recesses can be harder to reach. Fixture position and the treatment path should be included in trials.
The surface condition can change after activation because of molecular rearrangement, migrating additives, contamination or storage. Define the permitted interval between treatment and printing, and test credible production interruptions. A process that works with immediate printing may behave differently after an extended wait.
Assess the print and the component
Increasing treatment exposure indefinitely is not a reliable development strategy. Excessive exposure can damage the surface or affect the component. Check the part as well as the printed image, including any functional surfaces that could be reached unintentionally.
Include an untreated control in the comparison. If a compatible ink meets the requirements without activation, an extra treatment step may be unnecessary. When treatment is needed, establish an operating window with acceptable print appearance, adhesion, durability and component integrity.
AAE can investigate pre- and post-treatment settings through sample printing. Bring the actual material grade, geometry, product history and acceptance requirements to the discussion.
Discuss surface preparation for your product
Share your component, artwork and production requirements with AAE to discuss the next step.
Discuss your applicationRelated printing and assembly questions
- Why does ink fail to adhere to plastic parts?
- How to test print adhesion and durability on plastic components
- Why product positioning matters in printing and assembly automation
- How to integrate printing and assembly in one automated system