Micronized Calcite for Paper - Pulp & Paper
Micronized calcite is used with the addition of 15-30% to cellulose in writing papers, wallpapers and cartons. Due to its high whiteness, its cheapness and other technical features that it gives to paper, it has entered the paper industry starting from Europe and replacing kaolin all over the world. The paper industry, which produces with the acid system where kaolin is used in the filling, turned to the method defined as neutral gluing or alkaline system increasingly. In the papers produced, thus, yellowing was prevented over time and more calcite filler was added compared to kaolin. This means less cellulose consumption and less optical brightener use. Thus, calcite has made serious contributions to environmental protection.
About half of the raw material used in the paper industry in the world is ground calcite and PCC (precipitated calcite). The most important part of this is the calcite produced for use in the filling and 25-30% of it is coated calcite. In Europe, generally 60% is wet ground calcite smaller than 2 microns and 75% wet and 25% solid forms are used in as the filling in the paper industry. Again, 88-90% is used for coating the wet ground coated calcite smaller than 2 microns. In Turkey, Seka and some private establishments pay attention to the grain distribution of filling calcite but 42-44% below 2 microns is used in dry ground calcite filling. Some paper producers even use around 36-38% of calcites below 2 microns.