Color ink residue on film surface

Phenomenon:
After the PET film is peeled off, there is color ink residue on the film surface

Possible causes in order:
① The front heating plate is not fully heated, and the recommended temperature is 75-85 ℃.
② The oven temperature does not increase to the specified temperature before the powder is shaken through the oven
Workaround:
After the front heating plate is sufficiently heated and the oven temperature is sufficiently raised, print and shake powder