印刷油墨 化学品
印刷油墨原料包括清漆、树脂、颜料、增塑剂、蜡和溶剂，用于胶印、凹版、柔版和丝网印刷油墨。每种印刷工艺对流变性、粘性、干燥机制和承印物相容性有不同要求。
常见问题 — 印刷油墨 化学品
What are the main resin types used in printing inks?
Offset inks use hard, high-tack resins: rosin-modified phenolics, alkyd varnishes, and petroleum resins for sheet-fed; mineral oil-gelled varnishes for heatset web. Gravure inks use nitrocellulose, polyurethane, or acrylic resins dissolved in fast-evaporating solvents. Flexo inks use acrylic emulsions or solventborne polyamide resins. UV inks use acrylated oligomers (epoxy acrylate, urethane acrylate) cured by radical photoinitiators.
How is tack measured and controlled in offset inks?
Tack is measured with an inkometer (Tack-O-Scope) at standardized RPM and temperature (32°C/200 RPM typical). Sheet-fed offset inks run at tack 10–18; heatset web inks at 6–12. Tack is controlled by: adjusting resin concentration, adding tack reducer (petroleum distillate, mineral oil), or using softer resins. Ink train sequence is highest tack first down to lowest to prevent back-trapping.
What additives control set-off and blocking in printing inks?
Set-off (ink transfer from printed sheet to the back of the next sheet in the pile) is controlled with hard waxes (PE, PTFE, carnauba), anti-set-off spray powder (starch, CaCO3), and fast-setting varnish vehicles. Blocking (adhesion between printed substrates under pressure/heat) is prevented with hard wax additives, slip agents, and ensuring full ink cure before rewinding. PTFE and polyamide waxes give the best combination of slip and anti-blocking.
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