scholarly journals Study on modification of calcium carbonate for paper filler

2016 ◽  
Author(s):  
Yanqing Wu ◽  
Chuanshan Zhao ◽  
Yifei Jiang ◽  
Wenjia Han
Keyword(s):  
Calcium Carbonate ◽  
Paper Filler

The potential of fly ash-based calcium silicate as paper filler: Physical properties and printability

TAPPI Journal ◽  
2014 ◽  
Vol 13 (10) ◽  
pp. 49-57 ◽  
Author(s):  
SHUNXI SONG ◽  
MEIYUN ZHANG ◽  
ZHIRUN YUAN ◽  
JIAN WANG ◽  
JUNMIN SUN ◽  
...  
Keyword(s):  
Fly Ash ◽  
Calcium Carbonate ◽  
Physical Properties ◽  
Calcium Silicate ◽  
Power Plants ◽  
Low Cost ◽  
Paper Industry ◽  
Value Added ◽  
Surface Strength ◽  
Paper Filler

The development and application of low-cost and high-performance fillers by the paper industry is one of the most interesting aspects of filler technology. A novel calcium silicate, a byproduct, known as fly ashbased calcium silicate (FACS), from the value-added use of fly ash of coal-fired power plants, can be used as paper filler. To simulate the industrial papermaking process, a dynamic sheet former was used to evaluate the effect of FACS on the physical properties and printability of calendered paper. The results were compared with those of commonly used fillers, i.e., ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC). FACS-filled paper delivered a higher bulk than GCC-filled or PCC-filled papers at a given paper roughness. In addition, use of the original FACS exerted less influence on the tensile and tear strength of the filled paper. Printing quality tests indicated that at the same print density, the ink demand of FACS-filled paper was higher than that of GCC-filled or PCC-filled papers, but lower print through was obtained at the same amount of ink transferred to paper. The paper sheets containing the original FACS exhibited better surface strength than PCC-filled sheets. The results support the potential use of FACS as a low-cost filler for fine paper production.

Optimization of the microstructure of carbonized lime mud by sodium polyacrylate

2019 ◽  
Vol 34 (3) ◽  
pp. 264-270
Author(s):  
Jian Wang ◽  
Yaowei Xu ◽  
Zhijie Wang ◽  
Jianpeng Sun ◽  
Min Liu
Keyword(s):  
Calcium Carbonate ◽  
Structural Changes ◽  
Surface Microstructure ◽  
Sodium Polyacrylate ◽  
Application Performance ◽  
Carbonization Process ◽  
Lime Mud ◽  
Carbonate Particle ◽  
Paper Filler ◽  
Calcium Carbonate Particle

Abstract Lime mud (LM) is a by-product originated from the causticization process of papermaking industry. Microscopic structural changes of LM in carbonization process lead to defects on its performance. Regulating the growth of calcium carbonate obtained from the carbonization process and preventing its influence on the surface microstructure of LM has become the key to achieve the self-digestion of this solid waste. In this study, microscopic structural changes of LM co-carbonized with sodium polyacrylate (PAAS) were investigated. The results showed that, compared with traditional carbonation, the microstructure of LM co-carbonized with PAAS was changed remarkably. The newly calcium carbonate formed in the carbonization process would be solidified and coated on the LM surface. Then LM co-carbonized with PAAS would have a smaller specific surface area, pore volume and pore size, which significantly improved its application performance when it was used as paper filler. In addition, a potential technique for improving the surface microstructure of calcium carbonate particle was proposed.

Synthesis of Precipitated Calcium Carbonate Using a Limestone and its Application in Paper Filler and Coating Color

2007 ◽  
Vol 544-545 ◽  
pp. 881-884 ◽  
Author(s):  
Sang Hwan Cho ◽  
Jin Koo Park ◽  
Seung Kwan Lee ◽  
Sung Min Joo ◽  
Im Ho Kim ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Optical Properties ◽  
Calcium Carbonate ◽  
Reaction Temperature ◽  
Reaction Process ◽  
Precipitated Calcium Carbonate ◽  
Bursting Strength ◽  
Coating Color ◽  
Paper Filler ◽  
Tearing Strength

Homogeneous precipitated calcium carbonate(PCC) was synthesized by calcinations, hydration and carbonation of limestone which has been deposited in Danyang, Korea. In the reaction process, shapes(scalenohedral and cubic) and sizes(0.2~0.3μm and 2.0μm) of the powder were controlled by reaction temperature. Synthesized PCC was applied to hand-made paper as filler and coated paper. For the prepared papers, physical/optical properties(brightness, whiteness, opacity, roughness, gloss, tensile strength, internal tearing strength, stiffness, bursting strength) and printability(ink gloss, ink set-off, dry pick, wet pick) were characterized

scholarly journals EFFECT OF MICROCRYSTALLINE CELLULOSE AS A FILLER AND/OR FILLER RETENTION AID ON THE MECHANICAL PROPERTIES OF BAGASSE PAPER SHEETS

2020 ◽  
Vol 54 (9-10) ◽  
pp. 993-1000
Author(s):  
AHMED EL-GENDY ◽  
MOHAMED EL-SAKHAWY ◽  
ABEER M ADEL ◽  
MONA T. AL-SHEMY
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Microcrystalline Cellulose ◽  
Thermal Analyses ◽  
Cationic Starch ◽  
Green Material ◽  
Breaking Length ◽  
Paper Filler ◽  
Filler Retention

Microcrystalline cellulose (MCC), as a green material derived from bagasse, was investigated as an additive (0-3 wt%) in the preparation of bagasse paper sheets, in comparison with cationic starch. The effect of MCC addition, in the presence of 15% kaolin or 15% calcium carbonate as paper filler, was also studied. The properties of bagasse paper sheets loaded with MCC or cationic starch, in the presence or absence of 15% kaolin or 15% calcium carbonate as paper filler, were evaluated in terms of breaking length, burst, tear, opacity and filler retention values. Also, SEM and thermal analyses of the paper sheets were performed. It was found that all the properties of the bagasse paper sheets were improved as a result of MCC or cationic starch addition and, in general, the observed improvement increased as the percent of addition increased. Calcium carbonate and cationic starch, in general, gave superior properties, compared to kaolin and MCC, respectively. Overall, MCC could be considered as an alternative economically viable paper additive.

A TEM study of the microstructure of avian eggshells

1992 ◽  
Vol 50 (2) ◽  
pp. 1102-1103
Author(s):  
S. Q. Xiao ◽  
S. Baden ◽  
A. H. Heuer
Keyword(s):  
Electron Microscope ◽  
Calcium Carbonate ◽  
Nucleation And Growth ◽  
Growth Mechanisms ◽  
Shell Surface ◽  
Thin Sections ◽  
Polycrystalline Metals ◽  
Transmission Electron ◽  
Nucleation And Growth Mechanisms

The avian eggshell is one of the most rapidly mineralizing biological systems known. In situ, 5g of calcium carbonate are crystallized in less than 20 hrs to fabricate the shell. Although there have been much work about the formation of eggshells, controversy about the nucleation and growth mechanisms of the calcite crystals, and their texture in the eggshell, still remain unclear. In this report the microstructure and microchemistry of avian eggshells have been analyzed using transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS).Fresh white and dry brown eggshells were broken and fixed in Karnosky's fixative (kaltitanden) for 2 hrs, then rinsed in distilled H2O. Small speckles of the eggshells were embedded in Spurr medium and thin sections were made ultramicrotome.The crystalline part of eggshells are composed of many small plate-like calcite grains, whose plate normals are approximately parallel to the shell surface. The sizes of the grains are about 0.3×0.3×1 μm3 (Fig.l). These grains are not as closely packed as man-made polycrystalline metals and ceramics, and small gaps between adjacent grains are visible indicating the absence of conventional grain boundaries.

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