Polymerization Mechanism
Instantaneous drying of specialized inks and coatings through high-energy radiation occurs without the need for thermal drying or chemical initiators. This process of electron beam curing uses accelerated electrons to break chemical bonds and initiate polymerization in monomeric coatings. It provides a robust alternative to conventional ultraviolet curing, particularly for heavy-duty paperboard.
This technology produces a highly cross-linked polymer network almost instantly.
Energy Efficiency
Depth of penetration achieved by the electron stream allows thick or opaque coatings to cure uniformly across the entire board surface. Unlike light-based systems, which can be blocked by heavy pigments, the electron beam penetrates deeply into the material. This ensures that the bottom of the ink layer receives the same energy as the top.
Packaging lines run faster because they do not have to wait for thermal evaporation.
Packaging Safety
Elimination of photoinitiators in this curing process significantly reduces the risk of chemical migration in food-grade paperboard packaging. Because the polymerization is initiated directly by the electron beam, there are no residual photoinitiator molecules left in the dry ink film to migrate into food. This makes the technology highly favored for primary food packaging, such as milk cartons and frozen food boxes.
Furthermore, the absence of heat during curing prevents the paperboard from drying out or warping on the press. By maintaining the moisture balance of the paperboard, this curing method ensures excellent dimensional stability and flat sheets for the subsequent folding and gluing operations.
