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Effects of MFC-modified GCC as Filler on the Opacity of Pulp Handsheets
Received:May 28, 2020    Click here to download the full text
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Author NameAffiliation
Su Yanqun China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102, China
National Engineering Laboratory for Pulp and Paper, Beijing, 100102, China 
Liu Junjie China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102, China 
Liu Jingang China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102, China
National Engineering Laboratory for Pulp and Paper, Beijing, 100102, China 
Zhang Ruijuan China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102, China
National Engineering Laboratory for Pulp and Paper, Beijing, 100102, China 
Chen Jinghuan China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102, China
National Engineering Laboratory for Pulp and Paper, Beijing, 100102, China 
Du Yanfen China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102, China
National Engineering Laboratory for Pulp and Paper, Beijing, 100102, China 
 
Abstract:Microfibrillated cellulose (MFC) was obtained by mechanical grinding of different pulps. MFC-modified ground calcium carbonate (GCC) was prepared in two different ways, designated MFC-GCC composite filler and MFC-GCC flocs filler. The opacity of pulp handsheets loaded with MFC-modified GCC was measured. The effects of MFC originated from different pulps, pretreatment method, and filler modification on the opacity of handsheets loaded with MFC-modified GCC were discussed. The results show that MFC originated from alkaline peroxide mechanical pulp (APMP) was optimal for improving the opacity of the handsheets and PFI grinding pretreatment for MFC provided a denser structure in the corresponding MFCAPMP-GCC floc filler while enzyme pretreatment was more effective in increasing the opacity of the filled paper. Under the experimental conditions, the opacity of handsheets increased from 81.0% to 82.7% when the unmodified GCC was replaced by an equivalent amount of MFCAPMP-GCC composite filler, while other properties were unchanged.
keywords:microfibrillated cellulose  ground calcium carbonate  modification  opacity
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