Why does nylon film sometimes produce color migration and color penetration after printing?
Color transfer and color penetration are two different concepts
1) The color transfer is mainly that the small molecules of pigment in the ink layer do intense Brownian motion under the action of a certain temperature, thus breaking away from the lattice formed by the weak intermolecular force, and following other organic molecules to do the migration movement together to disperse the color;
2) Color penetration refers to that the plastic printing substrate is superimposed on top and bottom, and the pattern printed on the upper substrate is printed on the surface of the lower substrate.
The main reason is: in the plastic film polymer printed with ink film, the polymer moves violently to form interstitial pores. When the temperature rises, the pores also expand and enlarge. At this time, pigment molecules also do intense Brownian motion, and they will diffuse and penetrate through the pores. In particular, blue lotus and peach red are more prone to color penetration.
The diffusion and penetration of pigment molecules mainly occurs in the amorphous region of the polymer chain of plastic film during thermal movement. Nylon film, non-linear polyethylene and other types of films belong to amorphous plastics. Due to their low crystallinity and large molecular gap, they are easy to thermal deformation, absorb large amount of water and hydrolyze when heated, especially in high temperature and humidity environment. Therefore, this type of plastic film is more prone to some color penetration phenomenon.
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