A fine paper production line 1000 tn/d in Finland installed In-Line PCC™ production system supplied by Wetend Technologies Ltd. The process was started up a year ago to produce precipitated calcium carbonate(PCC)loaded directly on papermaking stock thus generating a filler-fiber-fibril composite.
The In-Line PCC process is a completely new production method consisting of TrumpJet Flash Mixing Reactor installed into PM approach flow system, limeslaking, cleaning process, carbon dioxide storage and dosing system.
The In-Line PCC technology is a simple and straight forward filler manufacturing process integrated directly into the main process. The key technologies are the very fast TrumpJet Flash Mixing process and Flow Through Reactor. Even filler distribution in a paper web means better formation and good paper strength properties, which also give opportunity to increase filler content in the paper or board; saving potential is significant. The concept can exploit commercial carbon dioxide recovered from fumes of boiler plant or lime kiln.
Detailed benefits of the process
The main benefit of the process are: Powerful fiber loading effect, good sheet and optical characteristics and very high retention of filler and fines. Better retention means that less filler penetrates through the wires, resulting to less wear and longer lifetime of wire fabric. Retention aid consumption can reduce 50…80%. In addition to cost savings it means also improvement of formation.
Crystallization process binds and eliminates interfering substances resulting to a much cleaner process, reduced solids and COD of white water. The clean process improves process runnability significantly and improves efficiency of wet end additives.
The concept gives opportunity to develop quality of paper, sheet filler content and cost structure of production with a modest investment cost. In- Line PCC filler-fiber composite is a new type of filler raw material. It is competitive in quality, price and in technology. The process is protected with patents and patent applications.
