scholarly journals Effect of PCC crystallization and morphology on flocculation with microfibrillated cellulose, on sheet densification and liquid absorption behavior

Cellulose ◽  
2020 ◽  
Vol 27 (17) ◽  
pp. 10151-10166
Author(s):  
Teija Laukala ◽  
Johanna Lyytikäinen ◽  
Katriina Mielonen ◽  
Kaj Backfolk
Keyword(s):  
Calcium Carbonate ◽  
Material Flow ◽  
Microfibrillated Cellulose ◽  
Precipitated Calcium Carbonate ◽  
Floc Structure ◽  
Liquid Absorption ◽  
Sheet Structure ◽  
Flocculation Aid ◽  
Flocculating Agent

Abstract Composite sheets consisting of elongated and aggregated cationically charged precipitated calcium carbonate (PCC) and native microfibrillated cellulose (MFC) were prepared with a wet laying method. The furnishes were prepared with and without an anionic flocculating agent (polyacrylamide) in order to adjust the structure of the sheet. The samples were compressed (densified) in order to determine the particle and microfibrillated cellulose-PCC structure coalescence and densification, as well as its subsequent influence on liquid absorption behavior. The densification affected both the vertical and lateral distribution of PCC, but the flocculating agent enhanced the compression stability and stabilized the sheets against PCC material flow. The differences between the sheets made with and without the flocculation aid affected the absorption of an anionic dye-based fluid ink, which was evident as a higher print density and less print bleeding. The absorption behavior was dependent on the sheet structure, especially on the PCC distribution within the sheets. Finally, the role of MFC on floc structure and floc formation is discussed. Graphic abstract

Role of additives to improve adsorption of xylan on precipitated calcium carbonate

Cellulose ◽  
2018 ◽  
Vol 25 (3) ◽  
pp. 1583-1598 ◽  
Author(s):  
Indrasena Ghosh ◽  
Chhaya Sharma ◽  
Rita Tandon
Keyword(s):  
Calcium Carbonate ◽  
Precipitated Calcium Carbonate

The Role of Crystal Control Agent in the Formation of Needlelike Calcium Carbonate Nano Particles

2011 ◽  
Vol 236-238 ◽  
pp. 2150-2159
Author(s):  
Yu Qian Ye ◽  
Xue Mei Chen
Keyword(s):  
Calcium Carbonate ◽  
Aspect Ratio ◽  
Crucial Role ◽  
Average Diameter ◽  
Morphological Characterization ◽  
Control Agent ◽  
Nano Particles ◽  
Precipitated Calcium Carbonate ◽  
Nanometer Particles

In this work, needlelike precipitated calcium carbonate (PCC) nanometer particles were synthesized by industrial carbonation route using EDTA as crystal control agent. The morphological characterization shows that the as-synthesized needlelike PCC particles have an average diameter of 52 nm and an aspect ratio of around 14:1. The results indicate that EDTA plays a crucial role in the formation of needlelike PCC nanometer particles. A possible mechanism for the formation of needlelike PCC particles assisted by the crystal control agent EDTA is also proposed.

Application of Talcum Powder as Filler in the Production of Base Sheet of Paper-Process Reconstituted Tobacco

2011 ◽  
Vol 236-238 ◽  
pp. 1164-1168
Author(s):  
Liang Wang ◽  
Feng Lan Wang ◽  
Yao Mao ◽  
Yuan Jun Yao ◽  
Yang Bing Wen
Keyword(s):  
Calcium Carbonate ◽  
Pilot Scale ◽  
Ash Content ◽  
Laboratory Scale ◽  
Final Evaluation ◽  
Absorption Characteristic ◽  
Precipitated Calcium Carbonate ◽  
Talcum Powder ◽  
Liquid Absorption ◽  
Scale Experiment

The application of talcum powder (TP) as filler in the production of base sheet of paper-process reconstituted tobacco were studied both by laboratory scale experiment and pilot scale trial. The results showed that using TP as filler of the base sheet obviously improved the ash content and liquid absorption characteristic of the base sheet compared with using precipitated calcium carbonate (PCC). Meanwhile, the smoking qualities of the base sheets were evaluated by the tobacco experts and the final evaluation results showed that the base sheet with TP had better smoking quality.

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

Transjøen, a Groundwater Influenced Lake with Special Redox and Sulphate Conditions

1976 ◽  
Vol 7 (5) ◽  
pp. 307-320 ◽  
Author(s):  
G. S. Bremmeng ◽  
A. E. Kloster
Keyword(s):  
Calcium Carbonate ◽  
Chemical Composition ◽  
Lower Layer ◽  
Calcium Content ◽  
Meromictic Lake ◽  
Redox Potentials ◽  
Precipitated Calcium Carbonate

Transjøen, a lake in S.E. Norway investigated hydrographically from October 1969 to October 1971, consists of two basins, both of which are meromictic (lake with lower layer which does not participate in the periodic circulations). The lake has a large influx of groundwater of very varying chemical composition. The calcium content is high and precipitated calcium carbonate and electrolyte rich groundwater is assumed to be the main reason for the meromictic stability. The redox potentials of monimolimnion (the lower layer which does not participtate in the periodic circulation) are extremely low, but in spite of this fact the content of sulphate is high.

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