Surface Integrity
Ink transfer dynamics define the ability of a coated paper substrate to withstand the mechanical pull of tacky printing inks during high speed offset production. Pick resistance determines whether the surface coating stays attached to the base stock or ruptures under stress. Failures occur when the adhesive strength of the coating layer remains lower than the splitting force of the ink film.
A controlled test involving standardized oils or specialized printing sequences quantifies this property by identifying the specific point where paper fibres or coating pigments lift from the sheet.
Coating Composition
Binders within the coating formulation maintain the structural cohesion of the paper surface. Synthetic latex or starch additives provide the bonding power needed to prevent picking during heavy ink coverage or heavy viscosity applications. High filler content reduces the binder efficiency by increasing the total surface area requiring coverage.
Insufficient drying during the manufacturing process leaves the coating vulnerable to water absorption and premature weakening.
Mechanical Demands
Printing presses exert significant stress on the substrate as the blanket cylinder separates from the paper surface. High speed operations increase this physical tension on the coating structure. Low temperature press environments heighten ink viscosity and demand higher levels of resistance to prevent tearing.
Extreme surface pull often leads to accumulation on blankets which necessitates frequent cleaning stops. A paper stock with superior bonding properties remains intact across the entire print run.
