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In-situ CaCO3 formation onto recycled wood pulp was studied to improve optical properties and ash attachment to the fiber furnish in papermaking. We controlled initial reaction temperature of in-situ CaCO3 formation method from 30C to 50C. It was found that the attachment of newly formed CaCO3 to recycled fibers, old newspaper (ONP) in this case, was stronger than that of ground calcium carbonate (GCC, mean dia. 2.4 μm) addition case, but was not much different among those formed at different temperature. Morphologies of newly formed CaCO3 were changed according to the reaction temperature. More aragonite shape was seen at higher temperature. In-situ CaCO3 formation increased brightness and lowered ERIC value of ONP sheet greatly at the same level of ash contents when compared to GCC addition method, but gave equivalent ERIC and brightness when compared to those of the precipitated calcium carbonate (PCC) addition method. However, tensile strength of the handsheets of the in-situ CaCO3 formation method were much greater than those of the PCC addition method.

Application of In-situ CaCO3 Formation Method for Better Utilization of Recycled Fibers (2)