|Wrong ink series was selected.
Incorrect ink and hardener mixing ratio.
Insufficient curing time.
|Refer to “Ink Substrate Guide” for proper ink and/or hardener series.
Use a gram scale to accurately measure out ink and hardener ratios.
Ink manufacturers recommend 72+ hours before any quality tests are conducted.
|Other Related Possibilities
|Insufficient heat applied for proper curing.
|Increase temperature or increase amount of time in the oven.
|Parts may have surface contamination from mold release, oil, grease or dust.
Surface tension of the substrate is too low.
|Clean parts before printing.
Pre-treat parts to increase surface tension (typical with polypropylene and polyethylene plastics).
Generally, poor adhesion results from not identifying the substrate before printing. Try to identify the type of plastic or coating before printing. A quick assessment can be made in the following manner:
Using a scrap part, wipe the part with a product like C-Solv. If the plastic or surface is damaged by the C-Solv, the ink will most likely adhere with acceptable results. If the plastic is not affected by the C-Solv, it will most likely have to have the surface tension raised by means of a pretreatment. Remember, all metal surfaces require a hardener to be added.
If you are not sure about your substrate, or would like us to conduct an adhesion test for you, feel free to contact our technical support team at (800) 982-1928.