scholarly journals Carboxymethylated cellulose nanofibrils in papermaking: influence on filler retention and paper properties

Cellulose ◽  
2019 ◽  
Vol 26 (5) ◽  
pp. 3489-3502 ◽  
Author(s):  
Ana F. Lourenço ◽  
Diana Godinho ◽  
José A. F. Gamelas ◽  
Pedro Sarmento ◽  
Paulo J. T. Ferreira
Keyword(s):  
Cellulose Nanofibrils ◽  
Paper Properties ◽  
Filler Retention

scholarly journals Effects of In-Situ Filler Loading vs. Conventional Filler and the Use of Retention-Related Additives on Properties of Paper

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5066
Author(s):  
Maria Emiliana Fortună ◽  
Andrei Lobiuc ◽  
Lucian-Mihai Cosovanu ◽  
Maria Harja
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Filler Loading ◽  
Carbonate Content ◽  
Sem Images ◽  
Paper Properties ◽  
Calcium Carbonate Content ◽  
Optical And Mechanical Properties ◽  
Filler Retention

In the present paper, aspects concerning the obtained and characterization of additive systems used for maximizing filler retention, and the effects on paper properties, were investigated. The effects of retention additives over properties of paper, containing fibers from in-situ loading (IS-CCP), were analyzed against the effects of additives over properties of paper containing fibers from conventional loading, obtained by the addition of calcium carbonate in precipitated form (CCP). The physico-mechanical properties were analyzed by various analyses and investigations: calcium carbonate content, X-ray diffraction, scanning electron microscopy (SEM) images, optical and mechanical properties, in order to develop the best systems of retention additives for obtaining higher retention loads for making paper with high content of nano-filler material. The obtained results reveal that at the same level of calcium carbonate content, all paper samples with in-situ loading had higher the optical and mechanical properties than the paper obtained by conventional loading in all cases the additives studied. For all studied properties, nanoparticles had a positively influence over paper properties.

Application of modified cellulose nanofibrils as coating suspension on recycled paper using size press

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hakan Fidan ◽  
Ayhan Tozluoğlu ◽  
Ahmet Tutuş ◽  
Bayram Poyraz ◽  
Recai Arslan ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Barrier Properties ◽  
Coating Material ◽  
Compression Tests ◽  
Recycled Paper ◽  
Paper Properties ◽  
Lower Viscosity ◽  
Coating Suspension ◽  
End Use ◽  
Recycled Fibers

Abstract Cellulose based nanomaterials have the great potential to be applied to paper as bulk additive or coating material to improve overall final properties, especially in secondary fiber. In the present work, the effect of applying different kinds of cellulose nanofibrils (CNF) to papers obtained from recycled fibers using size press on physical, mechanical and barrier properties was investigated and compared with the sole use of starch as coating material. The coating process of CNF was carried out by the addition of size press grade starch to coating suspension. As a cellulose source, wheat straw was evaluated and CNF was obtained through oxidative and enzymatic pretreatments. Results indicate that starch/CNF suspension improves the overall paper properties. As a result of the deposition of coating suspension contains of 4 % wt. periodate-oxidized CNF onto paper surface, tensile and burst indices of papersheets increased as 52.2 % and 194.4 %. Significant decreases were observed in air permeability as 69.8 %. Compression tests also have been conducted to evaluate papersheets end-use properties. In comparison to the other pretreated CNF, due to is lower viscosity, applying periodate-oxidized CNF as size press significantly increased the mechanical properties of the papers fabricated from the recycled pulps.

Role of particle size and preflocculation of talc in improvement of paper properties

TAPPI Journal ◽  
2014 ◽  
Vol 13 (4) ◽  
pp. 17-26 ◽  
Author(s):  
VIPUL SINGH CHAUHAN ◽  
NISHI KANT BHARDWAJ
Keyword(s):  
Particle Size ◽  
Strength Loss ◽  
Filler Loading ◽  
Paper Strength ◽  
Paper Properties ◽  
Viable Solution ◽  
Filler Retention ◽  
Mineral Fillers ◽  
Different Doses

Mineral fillers are added during papermaking to improve the optical and printing properties of paper and decrease energy costs. Filler loading using conventional approaches has some disadvantages, such as reduction in paper strength. The finer filler, the more the strength loss. Several methods and materials have been reported to overcome or alleviate the same, but with higher costs. Our approach provides an economically viable solution to the problem, using conventional papermaking materials. Talc filler of different particle sizes, preflocculated using different doses of cooked amphoteric starch, were used for papermaking. Relatively higher filler retention, paper strength, and hydrophobicity of paper were obtained with preflocculated talc compared to native talc. The optical properties of paper were unchanged on the loading of similar talc after preflocculation. The preflocculated talc of finer particle size provided higher opacity at similar ash, as well as paper strength, than the native talc of coarser size.

Effect of retention rate of fluorescent cellulose nanofibrils on paper properties and structure

2018 ◽  
Vol 186 ◽  
pp. 73-81 ◽  
Author(s):  
Qijun Ding ◽  
Jinsong Zeng ◽  
Bin Wang ◽  
Wenhua Gao ◽  
Kefu Chen ◽  
...  
Keyword(s):  
Retention Rate ◽  
Cellulose Nanofibrils ◽  
Paper Properties

Composite filler by pre-flocculation of fiber fines and PCC and its effect on paper properties

2020 ◽  
Vol 35 (2) ◽  
pp. 251-260
Author(s):  
Hyun Kang ◽  
Jong Myoung Won ◽  
Byoung-Uk Cho
Keyword(s):  
Strength Properties ◽  
Ash Content ◽  
Paper Strength ◽  
Precipitated Calcium Carbonate ◽  
Paper Properties ◽  
Loading Method ◽  
Retention Aids ◽  
Composite Filler ◽  
Filler Retention ◽  
Better Than

AbstractA composite filler was developed by pre-flocculation of fiber fines and precipitated calcium carbonate (PCC) particles with flocculants such as cationic polyacrylamide (cPAM) and bentonite. The composite filler was compared with a conventional loading method in terms of physical properties of handsheet and filler retention. The handsheets using the composite filler showed higher strength properties than that using a conventional loading at a similar paper ash content level, implying that paper ash content can be increased maintaining same level of paper strength. Optical properties such as opacity and brightness of the paper with the composite were quite similar with the paper with the conventional loading. Filler retention of the composite filler was slightly higher than that of the conventional loading even though retention aids were not used for the composite filler. Paper formation of the composite filler was better than the case of the conventional loading. However, the sheet with the composite filler showed lower bulk than that with the conventional loading. Conclusively, the composite filler technology by pre-flocculation of fines and filler has a potential to be utilized to produce a high loaded paper.

Effects of addition method and fibrillation degree of cellulose nanofibrils on furnish drainability and paper properties

Cellulose ◽  
2017 ◽  
Vol 24 (12) ◽  
pp. 5657-5669 ◽  
Author(s):  
Ming He ◽  
Guihua Yang ◽  
Byoung-Uk Cho ◽  
Yong Kyu Lee ◽  
Jong Myoung Won
Keyword(s):  
Cellulose Nanofibrils ◽  
Addition Method ◽  
Paper Properties

scholarly journals The effect of hemicellulose extraction on fiber charge properties and retention behavior of kraft pulp fibers

BioResources ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 219-231
Author(s):  
Katja Lyytikäinen ◽  
Esa Saukkonen ◽  
Isko Kajanto ◽  
Jari Käyhkö
Keyword(s):  
Surface Charge ◽  
Kraft Pulp ◽  
Paper Industry ◽  
Fiber Surface ◽  
Pulp Fibers ◽  
Paper Properties ◽  
Bleached Kraft Pulp ◽  
Filler Retention ◽  
Anionic Groups ◽  
Generation Technology

The integrated forest biorefinery (IFBR) concept provides a promising opportunity for the development of the pulp and paper industry. One proposed next generation technology for an integrated forest biorefinery is the extraction of hemicelluloses, allowing the co-production of pulp and different hemicellulose-based chemicals. In addition to paper properties, hemicelluloses are known to be important for the function of cationic papermaking additives, because they are the main source of charged groups in fibers. This paper shows that the alkaline extraction of hemicelluloses from bleached kraft pulp decreases both the total and surface charge of the pulps. It was found that the decreased fiber charge leads to increased filler retention with fixed retention aid dosage. The reduction observed in the fiber surface charge for alkali-extracted pulp was mainly attributed to the decrease in the amount of anionic groups located in fines.

Analysis of Calcium Sulphate Filler and its Application in Papermaking Process as Functional Filler

2011 ◽  
Vol 236-238 ◽  
pp. 1271-1276
Author(s):  
Yu Long Wang ◽  
Huai Yu Zhan ◽  
Yan Xin Liu ◽  
Fei Fei Liu
Keyword(s):  
Calcium Sulphate ◽  
Added Value ◽  
Paper Properties ◽  
High Brightness ◽  
Solubility In Water ◽  
Crystal Forms ◽  
Environment Problem ◽  
Filler Retention ◽  
Future Work ◽  
Very High

Calcium sulphate is rich in natural resources and by-product of many industrial processes. However, most calcium sulphate product was only used with low added value or treated as waste, harmful to environment. If the calcium sulphate can be used as papermaking filler, very high added value can be gained and also the environment problem can be solved. In this paper calcium sulphate from by product of industry was characterized by X-ray diffractometer (XRD) and scanning electron micrograph (SEM), and then used as papermaking filler. The influence of calcium sulphate filler on pulp suspension and paper properties was studies. The results showed that the calcium sulphate fillers were composed of three crystal forms, dihydrate, hemihydrate, anhydrite, and it was needle or fiber shape, hollow in the middle; calcium sulphate showed high brightness and high conductivity in water, compared with talc or ground calcium carbonate(GCC) filler. When calcium sulphate filler was used in papermaking process the filler retention was very small because of its high solubility in water. Calcination at high temperature can lower the solubility of calcium sulphate and slightly increase the retention, but the retention was still quite small. The future work should focus on controlling the solubility of calcium sulphate.

Filler modified by a sequential encapsulation and preflocculation method and its effect on paper properties

2020 ◽  
Vol 35 (1) ◽  
pp. 89-95
Author(s):  
Nannan Chen ◽  
Lijun Wang ◽  
Junchao Wen ◽  
Xianping Yao ◽  
Wenyan Zhao
Keyword(s):  
Filler Content ◽  
Strength Properties ◽  
Paper Strength ◽  
Cationic Starch ◽  
Paper Properties ◽  
Polyelectrolyte Complexes ◽  
New Methods ◽  
Charge Potential ◽  
Filler Retention ◽  
Anionic Polyacrylamide

AbstractIncreasing the filler content of sheet tends to decrease filler retention and paper strength properties. To overcome this problem and make better use of fillers, development of new methods on filler modification has never been stopped. In this study, filler modification was carried out by sequentially adding an anionic polyacrylamide, a cationic starch and a cationic polyacrylamide. It is believed that in this process, multiple polyelectrolyte complexes are formed which can not only encapsulate filler particles but also preflocculate the particles. The results showed that, compared to the single preflocculation treatment, the sequential encapsulation and preflocculation (SEP) treatment brought significantly larger particle size and higher surface charge potential of the filler, thus higher filler retention was achieved. When the modified fillers were used for papermaking and paper ash contents were controlled at the same level, the SEP modification was better in improving the tensile index, internal bond strength and tearing index of paper than the single preflocculation method, in addition, it maintained better paper formation, caused insignificant change on opacity of paper. It is believed that this newly developed SEP method is worthy of being applied to industrial scales in making various grades of filled paper.

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