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Paper Coating Formulas

Coating Application / Metering. Most common metering processesroll coatingblade coatingair knife coatinglow impact coatingspray coatingwet / drycurtain / slide / slot. Coating Application / Metering. Current technology emphasizes random, uniform dispersion of all coating components prior to a

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Paper Coating Formulas

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    1. Paper Coating Formulas Currently dominated by aqueous, pigmented systems. Pigment - 96 to 50% of total weight Calcium Carbonate and Kaolin dominate synthetic (poly-styrene) pigments Talc / Satinwhite / Aluminum Tri-hydrate etc…. Binder - 4 to 50% of total weight Emulsion (Latex) polymers dominate starches (corn, potato, tapioca) milk (casein) and soy protein (isolate)

    2. Coating Application / Metering Most common metering processes roll coating blade coating air knife coating low impact coating spray coating wet / dry curtain / slide / slot

    3. Coating Application / Metering Current technology emphasizes random, uniform dispersion of all coating components prior to application “condenses” as water removed drainage to basestock evaporation (active drying) rheology optimized for metering processes minimize particle - particle interactions how to induce order (decrease entropy)

    4. Binder as a “necessary evil” (Here’s the necessary part) Cohesion of coating is primary function resist disruption by mechanical / physical (solvation) processes Binder content contributes to properties opacity / brightness (scattering) permeability (air and liquid) calender response ink setting / print quality

    5. Binder as a “necessary evil” Expense can be 10X versus mineral pigments represent as much as 50% of total formula cost handling / storage / preservation “natural binders” starches proteins environmental impact latexes non-renewable slower to degrade

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