Finishing colour developer paper

摘要

A paper web (1) carrying a coating of inorganic colour developing coreactant material is unwound from a reel (4) and passed through a nip (9) between two heated calender rolls (6) kept at a temp. above that of the web (1). - Coreactant material is pref. acidic clay esp. acid washed dioctahedral montmorillonite clay. Rolls (6) may be fabricated from chilled iron and are partic. kept at 110 deg.C at least; they may be heated by pressurised steam, H2O or oil.