Dynamic Shear Modulus Degradation Limits in High Speed Recyclable UV Resin Formulations
Dynamic shear degradation limits UV resin velocity at 280 m/min to prevent oligomer scission, balancing resin costs against full EPR fee savings.
Misting Propensity
Fluid Behavior
Tendency of a liquid to eject small droplets into the surrounding air during high speed processing defines the cleanliness of a printing or coating operation. Misting propensity is a function of the ink’s internal cohesion and the centrifugal forces generated by rotating rollers. When the film splits at the exit of a nip, the elongated filaments must snap back cleanly rather than shattering into an aerosol.
Atomization Factor
Rheological properties such as tack and elasticity determine how readily the fluid breaks into a fine spray. If the misting propensity is high, the air near the distribution rollers becomes saturated with microscopic particles. Adjusting the temperature of the rollers can alter the viscosity enough to mitigate the formation of these droplets.
Press Hygiene
Accumulation of airborne ink particles on machine frames and sensors leads to increased maintenance requirements and potential electronic failures. High levels of misting propensity can also cause ghosting on the printed substrate as the aerosol settles back onto the web. Contamination of the work environment poses a challenge for air filtration systems and operator safety.
Controlling this behavior is essential for maintaining the optical clarity of unprinted areas on high quality packaging and preventing loss of stock.