GRC 211 Lecture Notes - Lecture 3: Calendering, Paper Machine, Titanium Dioxide
28 May 2017
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Document Summary
Evenly distributes fiber mixture on a moving wire. Transfers wet sheet from wire section to press section. Paper made by fourdrinier machine has different properties on each side. Vacuum collects small fibers on wire side. Function of finishing: to achieve special appearance properties. Paper web travels through rollers to apply pressure. Soft calendering: one hard roller (metal) and one soft roller (rubber) Supercalender a (sca) vs. supercalender b (scb) Sca: more filler in paper = smoother. Hard (nip) calendering: two hard rollers (metal) Changes ability of paper to receive ink. Ink hold-out: ability of ink to stay on the surface of paper rather than being absorbed into paper. Coating materials: calcium carbonate, clay, titanium dioxide. Coating finishes: [most gloss] cast coated, gloss coated, matte coated, dull coated [less gloss] Coat surface, then uses blade to wipe off excess. Does not result in even coating thickness. Two rollers in pair: male roller and female roller.
