Influence of corona treatment decay on print quality in water‐borne flexographic printing of low‐density polyethylene‐coated paperboard

Abstract

The decrease in the corona treatment effect with time and its influence on the flexographic printability of low-density polyethylene-coated paperboard were studied. After corona treatment, sheets were stored in different ways. Some sheets were stored in a laboratory atmosphere, while others were protected from exposure to light, air, moisture and dust in polyethylene bags. The tendency for ink to spread on the surfaces was studied using contact angle measurements. Printability was evaluated as print density, dot gain, uncovered (white) and mottling. The results obtained show that the surface energy of the protected sheets decreased with time, but not as much and not as quickly as that of the unprotected sheets. In the case of the protected sheets, the percentage uncovered areas and mottling remained constant, but for the unprotected sheets they increased with increasing time after the corona treatment. No significant differences were seen in the other print quality measures.

The relationship between morphology development and mechanical properties in thermoplastic protein blends

“…Surface energy of each material was calculated using the Young-Dupré equation, [26] and subsequently the interfacial tension was determined based on the harmonic mean equation. An FTA1000B instrument (First Then Angstorm, USA) was used to place a droplet of solvent on the material.…”

Manipulating morphology in thermoplastic protein/polyester blends for improved impact strength

“…The Young-Dupré equation [23] was used for surface energy calculations, and subsequently, the harmonic mean equation [24] was used to calculate blend interfacial tension. Droplets of water, ethylene glycol (both polar), and diiodomethane (nonpolar) were placed onto a sample using an FTA1000B instrument (First Ten Angstroms, USA), and contact angle values were calculated from an average of six drops.…”

Enhancement of flexographic print quality on bleached kraft liner using nano-silica from rice husk

“…Coatings using a thin homogeneous polymer film and corresponding surface modification by corona treatment greatly increase the water wettability on the coated paper. The increase of surface energy leads the coated polymeric film on the paper substrate allows the water-based ink vehicle to penetrate into the paper structure while the ink pigment adheres onto the paper surface [2][3][4][5][6][7].…”