The GRAFICO® Calcium Carbonate Saver is a carbon dioxide application developed and patented by Linde together with the cooperation partner UPM-Kymmene to be used when calcium carbonate is introduced as a filler in the production of paper qualities containing mechanical pulp like newsprint and SC paper. The conditions at the paper machines are often such that calcium carbonate starts to dissolve and papermakers are familiar with problems originated from free calcium in the system. GRAFICO® Calcium Carbonate Saver will help to prevent calcium carbonate from dissolving due to local pH-changes or slightly acidic conditions and create conditions for more stable process.
GRAFICO® is a patented method developed to reduce the dissolution of calcium carbonate in neutral processes using mechanical or deinked pulp. The conditions in the paper process often cause calcium carbonate to begin to dissolve, which may lead to runability problems, precipitations and increased consumption of several chemicals.