Binder Migration

Drying Phenomenon

Movement of adhesive particles toward the surface or the base of a coating layer during the evaporation of water. High temperatures in the drying section of a coating machine often trigger binder migration. This redistribution creates an uneven concentration of latex or starch within the dried film.

Visual Defect

Uneven distribution of coating materials can lead to mottle and poor ink receptivity. If binder migration occurs, the surface of the board will have areas that absorb ink differently, resulting in a splotchy appearance. This problem is particularly visible in large areas of solid color.

Converters often adjust the drying profile or the viscosity of the coating color to prevent this outcome. Design choices regarding coatings, adhesives, primers and inks heavily influence the final score. The chemistry of the binders and the porosity of the base sheet are the primary factors that influence how the liquid moves during the heat application.

Adhesion Failure

Surface strength is compromised when the internal bond between the coating and the fibres becomes weak. If too much adhesive moves away from the interface, the coating may delaminate during the printing process. This leads to picking, where the ink pulls fragments of the surface away from the sheet.

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Laser Triangulation Specular Reflection TAPPI T 411

Quantifying Subsurface Light Scattering Drift in Polarized Multi Wavelength Dual Beam Telecentric Triangulation

Subsurface light penetration introduces up to 25 micrometers of optical drift in laser triangulation, requiring cross-polarization and grade-specific ISO 534 calibration.

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Ground Calcium Carbonate Print Picking Heatset Web Offset

Dynamic Capillary Liquid Transport Kinetics during High Speed Printing of Lightweight Coated Virgin Graphic Sheets

Dynamic fluid transport in lightweight coated sheets shifts from inertial to capillary control within milliseconds, demanding balanced pore throat sizing.

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Pinhole Dye Test Dynamic Mechanical Analysis Tensile Yield Stress

Viscoelastic Resin Yield Dynamics in Score Line Coating Crease Mechanics

Selecting ductile resin binders with glass transition temperatures below minus five degrees Celsius prevents coating micro-cracking during paperboard crease folding.

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Ethoxylated Acetylenic Diols Shear Rate Blade Coating Systems

Dynamic Contact Angle Relaxation Kinetics in High Speed Blade Coating Systems

Dynamic contact angle relaxation rates dictate air entrainment and streak defect thresholds in high speed blade coating systems operating above 1200 m/min.

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Coated Graphic Papers Surfactant Bloom Contact Angle Dynamics

Surface Tension Decay Dynamics in Low Grammage Coated Virgin Hardwood Graphic Papers

Dynamic surface tension decay in lightweight virgin hardwood papers dictates fountain solution uptake and ink setting, requiring strict dynamic contact angle limits in mill purchase specs.

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Dynamic Surface Tension Surface Energy Mapping Curtain Coating

Dynamic Surface Tension Modification Impact on Wetting Speeds in High Speed Coating Application

Dynamic surface tension reduction below 40 mN/m within 10 milliseconds prevents air entrainment, enabling coater speed increases above 1,300 m/min.

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