Mercury Intrusion Porosimetry ISO 15901 Dynamic Surface Absorption Inspection Protocols
ISO 15901-1 porosimetry paired with dynamic sorption testing qualifies coating pore structures to prevent back-trap mottle and ink setting failures on press.
Dynamic Absorption
Fluid uptake
Fluid penetration measurements taken under active pressure or compression simulate how printing papers behave during high-speed ink transfer. Dynamic absorption determines the rate of liquid uptake during the milliseconds when the paper contact with ink occurs in a press nip.
Measurement Method
Standard static tests often fail to reflect the fast, pressurized conditions of modern printing lines where ink is forced into the sheet. Evaluating dynamic absorption requires automated testing instruments that apply a drop of liquid to the surface and monitor the change in volume under a mechanical pulse. This simulates the momentary squeeze of the printing rollers, showing how the capillary structure of the paper responds to sudden force.
Presswork Impact
Printing substrates must absorb the carrier solvent rapidly enough to prevent set-off but slowly enough to keep the pigment on the surface for maximum density. If the dynamic absorption is too high, the ink sinks deep into the sheet, resulting in a dull image and potential strike-through on the reverse side. Conversely, slow absorption leads to smearing and ink buildup on subsequent rollers in the press run.
Press operators rely on these values to adjust ink viscosity and dry times for specific paper runs, avoiding costly downtime caused by wet sheets.