The Study on Refining of Masson’s Pine Kraft Pulps for Sack Paper

2011 ◽  
Vol 236-238 ◽  
pp. 1297-1300
Author(s):  
Jia Liang Lan ◽  
Le Fan Ma ◽  
Zheng Guo Li ◽  
Fu Ji Wang ◽  
Bian Chu Liu
Keyword(s):  
Fiber Length ◽  
Kraft Pulp ◽  
Air Permeability ◽  
Kraft Pulps ◽  
Tensile Index ◽  
Tear Index ◽  
High Consistency

High consistency refining (HCR) and low consistency refining (LCR) of unbleached Masson’s pine kraft pulps for sack paper were studied in this article. The properties of their refined pulp and handsheet were analyzed comparatively. The results showed a high consistency refining was more suitable for sack paper with unbleached Masson’s pine kraft pulp than a low consistency refining. High consistency refining is of advantage to retain the fiber length. The tear index of the handsheet of high consistency refining were higher than that of low consistency refining. The TtensileT TenergyT Tabsorption (TEA)T index and air permeability of the handsheet of high consistency refining which were crucial properties of sack papers were better, though higher tensile index could be obtained with low consistency refining.

Action Mechanism of the Improvement of Printability for Eucalypt Bleached Kraft Pulp Pretreated by Cellulase

2013 ◽  
Vol 779-780 ◽  
pp. 294-301
Author(s):  
Wan You Tang ◽  
Li Chen ◽  
Zheng Jian Zhang
Keyword(s):  
Tensile Strength ◽  
Fiber Length ◽  
Kraft Pulp ◽  
Pulp Fiber ◽  
Fiber Morphology ◽  
Strength Index ◽  
Bleached Kraft Pulp ◽  
Tear Index ◽  
Pulp Sample ◽  
The Mean

Enzymatic refining of eucalypt bleached kraft pulp with the cellulase NOV476 was studied. The effects of this cellulase on the physical properties of pulp, fiber morphology and fiber appearance of the eucalypt bleached kraft pulp in different application conditions were discussed. The results show that, with the increase in the amount of enzyme, tensile strength index, burst index and TEA index of paper are increased and then decreased; elongation and tear index of paper have been declining, Zeeil tensile strength index has been an upward trend. Without beating the pulp sample, gradually increases as the amount of enzyme, the average fiber length and the average fiber width are gradually reduced, while mean kink index substantially constant. Number of vessels in fiber overall reduced tendency reaches a minimum in the amount of enzyme 0.5μ/g, the phenomenon is most obvious. In the same conditions of beating time, gradually increases as the amount of enzyme, the average fiber length is gradually reduced, an average fiber width is gradually increased, the mean kink index reaches a maximum in the amount of enzyme is 0.5μ/g. Number of vessels in fiber overall reduced trend.

scholarly journals Strong paper from spruce CTMP – Part II: Effect of pressing at nip press temperatures above the lignin softening temperature

2018 ◽  
Vol 33 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Sven Norgren ◽  
Gunilla Pettersson ◽  
Hans Höglund
Keyword(s):  
Compression Strength ◽  
Kraft Pulp ◽  
Softening Temperature ◽  
Strength Properties ◽  
Kraft Pulps ◽  
Cationic Starch ◽  
Tensile Index ◽  
Very High

Abstract The main objective of the current study was to demonstrate that it is possible to enhance strength properties of sheets from spruce HT-CTMP and CTMP furnishes up to the same level as is common on sheets from softwood kraft pulps by changing conditions in papermaking. To achieve that, sheets of spruce HT-CTMP and CTMP were consolidated at densities close to that of the reference bleach kraft pulp by pressing at press nip temperatures well above the tack and softening temperatures of lignin. On sheets from spruce CTMP (CSF 420 ml), where the fibers were surface treated with cationic starch, it was possible to reach tensile index at the same level as on sheets from the untreated reference kraft pulp. The compression strength (SCT) of CTMP and HT-CTMP sheets, which were achieved at the highest press nip temperature (200 °C) in the study, was equal to or higher than that of the reference kraft pulp sheets. The results show that there is a great yet unexploited potential in papermaking from spruce HT-CTMP and CTMP furnishes, which could be utilized in manufacturing of products where very high requirements upon strength is demanded.

scholarly journals MODIFIKASI PERMUKAAN SERAT LBKP DAN HASIL DEINKING DENGAN KARBOKSIMETIL SELULOSA

2016 ◽  
Vol 2 (02) ◽  
Author(s):  
Sonny Kurnia Wirawan ◽  
Nina Elyani ◽  
Jenni Rismijana
Keyword(s):  
Physical Properties ◽  
Carboxymethyl Cellulose ◽  
Kraft Pulp ◽  
Fiber Strength ◽  
Fiber Quality ◽  
Strength Properties ◽  
Sem Analysis ◽  
Tensile Index ◽  
Bleached Kraft Pulp ◽  
Tear Index

The strength properties of paper are strongly affected by fiber quality. The objective of this study was to assess the effect of modification fiber by carboxymethylation of leaf bleached kraft pulp (LBKP) and deinked pulp (DIP) by using carboxymethyl cellulose (CMC). Carboxymethylation was carried out by addition of various concentration of CMC and cationic agent of CaCl2. Handsheets with 70 gsm were made from the stock, and the physical properties were tested as the tensile index, stretch, tensile energy absorption (TEA), tearing index, and bursting index as well as SEM analysis. The results showed that the highest increase of fiber strength of LBKP and DIP was achieved by addition of 1% CMC and 9.19% CaCl2. For LBKP, the increasing of tensile index was 18.1%, stretch 27%, TEA 30.2%, tear index 7,8 % and burst index 16,7%. Whereas for DIP, the increasing of tensile index reached 29.9%, stretch 22.2%, TEA 61.2%, tear index 20.7% and burst index 63.1%. From the results of SEM analysis showed that the addition of CMC and CaCl2 increased fiber bonding.Keywords: CMC, LBKP, DIP ABSTRAK Sifat kekuatan kertas sangat dipengaruhi oleh kualitas serat. Tujuan penelitian ini adalah untuk mengetahui pengaruh modifikasi serat kraft putih kayu daun (LBKP) dan serat hasil deinking (DIP) dengan karboksimetilasi menggunakan karboksimetil selulosa (CMC). Modifikasi secara karboksimetilasi dilakukan dengan variasi penambahan CMC dan sebagai cationic agent CaCl2. Lembaran dibuat dari stok dengan gramatur 70 gsm, kemudian dilakukan pengujian fisik dengan parameter indeks tarik, regang, TEA, indeks sobek dan indeks retak. Selain itu lembaran juga diuji morfologi dan SEM. Hasil penelitian menunjukan peningkatan kekuatan lembaran tertinggi dicapai oleh LBKP maupun DIP, pada kondisi penambahan 1% CMC and 9.19% CaCl2. Untuk LBKP peningkatan indeks tarik adalah 18,1%, regang 27%, TEA 30,2%, indeks sobek 7,8 % dan indeks retak 16,7%. Sedangkan untuk DIP, peningkatan indeks tarik mencapai 29,9%, regang 22,2%, TEA 61,2%, indeks sobek 20,7% dan indeks retak 63,1%. Hasil analisa SEM menunjukan bahwa dengan penambahan CMC dan CaCl2, mengakibatkan terjadi peningkatan ikatan antar serat.Kata kunci: CMC, LBKP, DIP

Alkaline peroxide treatment of ECF bleached softwood kraft pulps: Part 2. Effect of increased fiber charge on refining, wet-end application, and hornification

Holzforschung ◽  
2007 ◽  
Vol 61 (4) ◽  
pp. 451-458 ◽  
Author(s):  
Zheng Dang ◽  
Thomas Elder ◽  
Jeffery S. Hsieh ◽  
Arthur J. Ragauskas
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Morphology ◽  
Kraft Pulp ◽  
Kraft Pulps ◽  
Cationic Starch ◽  
Force Microscopy ◽  
Tensile Index ◽  
Alkaline Peroxide ◽  
Atomic Force ◽  
Starch Adsorption

Abstract The effect of increased fiber charge on refining, cationic starch adsorption, and hornification was examined. Two pulps were investigated: (1) a softwood (SW) kraft pulp (KP) which was bleached elementally chlorine-free (ECF) and served as control; and (2) a control pulp treated with alkaline peroxide, which had a higher fiber charge. It was shown that increased fiber charge can improve the efficiency of the refining treatment, as indicated by differences in tensile index refined from 0 to 1000 revolutions. When the control pulp was refined from 4000 to 8000 revolutions, the tensile index decreased. In contrast, the tensile index of the higher fiber charge pulp (HCP) was higher under the same refining conditions. Upon addition of 2% cationic starch to both pulps, the tensile index of the control pulp increased by 13.7% and that of HCP by 23.7%. Atomic force microscopy did not reveal differences in the surface morphology of the two pulps with and without cationic starch adsorption. Peroxide treatment enhanced the fiber charge of the never-dried pulp. This was beneficial in reducing hornification when pulp was dried at 105°C. However, if the once dried pulp at 105°C was treated with peroxide, this resulted in a drastic decrease in intrinsic viscosity of the pulp and lower tensile and burst indices of the test sheets.

Modification of Bleached Softwood Pulp with Xylanase

2011 ◽  
Vol 393-395 ◽  
pp. 855-858
Author(s):  
Min Du ◽  
Xin Ping Li ◽  
Wu Guang Li
Keyword(s):  
Zeta Potential ◽  
Fiber Length ◽  
Fiber Surface ◽  
Enzymatic Treatment ◽  
Surface Wettability ◽  
Refining Efficiency ◽  
Tensile Index ◽  
Tear Index ◽  
Softwood Pulp ◽  
Enzyme Dosage

Xylanse named as Pulpzyme HC was used to modify bleached softwood pulp before refining. The efficiency of modification by different enzyme dosage was invested in this paper. The result showed that enzymatic treatment decreased the dissolved charge and absolute Zeta potential of the slurry and increased the fiber surface wettability. Appropriate Pulpzyme HC (0.4u/g) could improve the refining efficiency by 9.5°SR. The brightness and bulk of hand sheets increased with the increasing of the enzyme. Tensile index and tear index of hand sheets reached the maximum at the enzyme dosage of 0.2u/g. In this dosage, fiber length, knot index and curl index of fiber increased. But excessive enzyme decreased the tear index and had no effect on the tensile index.

scholarly journals EFFECT OF ADDITION OF DEINKED PULP TO BLEACHED KRAFT PULP ON TISSUE PAPER PROPERTIES

Wood Research ◽  
2021 ◽  
Vol 66 (3) ◽  
pp. 505-516
Author(s):  
Monika Stankovská ◽  
Mária Fišerová ◽  
Juraj Gigac ◽  
Elena Opálená
Keyword(s):  
Water Absorption ◽  
Kraft Pulp ◽  
Kraft Pulps ◽  
Initial Water ◽  
Paper Properties ◽  
High Brightness ◽  
Tissue Paper ◽  
Tensile Index ◽  
Bleached Kraft Pulp ◽  
Eucalyptus Kraft Pulp

The influence of addition of deinked pulps with low and high brightness to bleached eucalyptus and pine kraft pulps on functional tissue paper properties was studied. Deinked pulps with low and high brightness had some different functional properties. Deinked pulp with high brightness has higher bulk, porosity, water absorption after immersion, initial water absorption, bulk softness as well as brightness. On the contrary, the difference in relative bonded area and porosity e between deinked pulps with low and high brightness was moderate. The mixed pulps laboratory pulp sheets from bleached eucalyptus kraft pulp or bleached pine kraft pulp with addition of 20, 40 and 80% of deinked pulp with low brightness or deinked pulp with high brightness were prepared. The addition of the deinked pulp with high or low brightness to bleached kraft pulp leads to increasing of bulk, bulk softness as well as high water absorption after immersion and initial water absorption. The tensile index rapidly decreased by the addition of deinked pulps with high brightness to bleached eucalyptus and pine kraft pulps. Similarly, the addition of deinked pulp with low brightness to bleached pine kraft pulp led to rapid decreasing of tensile index. On contrary, with the addition of deinked pulp with low brightness to eucalyptus kraft pulp, the decreasing of tensile index was less pronounced. Mixed pulp from bleached eucalyptus kraft pulp with a small content of deinked pulp with low brightness with functional properties suitable for production of tissue papers was found as optimal.

Prebleaching of eucalypt kraft pulp with OP stages: Effect of an acid pretreatment or chelation step

TAPPI Journal ◽  
2012 ◽  
Vol 11 (6) ◽  
pp. 31-38
Author(s):  
TATIANA M. PÓVOAS ◽  
DINA A.G. ANGÉLICO ◽  
ANA P.V. EGAS ◽  
PEDRO E.G. LOUREIRO ◽  
LICÍNIO M. GANDO-FERREIRA ◽  
...  
Keyword(s):  
Eucalyptus Globulus ◽  
Comparative Evaluation ◽  
Kraft Pulp ◽  
Kraft Pulps ◽  
Acid Pretreatment ◽  
High Brightness ◽  
Pulp Viscosity ◽  
Brightness Reversion

We conducted a comparative evaluation of different treatments for the bleaching of eucalypt kraft pulps beginning with OP stages. The treatments tested were (1) an acid chelation stage with DTPA (OQP sequence); (2) a hot acid stage (AOP sequence); and (3) a chelant addition into the alkaline oxygen stage ((OQ)P and A(OQ)P sequences). The latter strategy was also studied for environmental reasons, as it contributes to the closure of the filtrate cycle. The OQP sequence leads to the highest brightness gain and pulp viscosity and the lowest peroxide consumption caused by an efficient metals control. Considering that the low biodegradability of the chelant is a problem, the A(OQ)P sequence is an interesting option because it leads to reduced peroxide consumption (excluding OQP) while still reaching high brightness values and similar brightness reversion to OQP prebleaching, with only a viscosity loss of 160 dm3/kg. Therefore, a hot acid stage could be considered when a separate acid Q stage is absent in a prebleaching sequence of Eucalyptus globulus kraft pulps involving OP stages.

Optimization of elemental chlorine-free bleaching for a softwood kraft pulp • part 2: economic analysis of chemical and steam consumption

TAPPI Journal ◽  
2010 ◽  
Vol 9 (9) ◽  
pp. 47-53 ◽  
Author(s):  
BRIAN N. BROGDON
Keyword(s):  
Chlorine Dioxide ◽  
Previous Investigation ◽  
Kraft Pulp ◽  
Energy Costs ◽  
Alkaline Extraction ◽  
Stage Versus ◽  
Kraft Pulps ◽  
Steam Consumption ◽  
Elemental Chlorine ◽  
Softwood Kraft Pulp

Our previous investigation [1] re-analyzed the data from Basta and co-workers (1992 TAPPI Pulping Conference) to demonstrate how oxidative alkaline extraction can be augmented and how these changes affect chlorine dioxide consumption with elemental chlorine-free (ECF) sequences. The current study manipulates extraction delignification variables to curtail bleaching costs with a conventional U.S. Southern softwood kraft pulp. The economic advantages of ~0.35% to 0.65% H2O2 peroxide reinforcement in a 70°C (EOP)-stage versus 90°C (EO)-stage are predisposed to the brightness targets, to short or long bleach sequences, and to mill energy costs. Minimized bleaching costs are generally realized when a 90°C (EO) is employed in D0(EO)D1 bleaching, whereas a 70°C (EOP) is economically advantageous for D0(EOP)D1E2D2 bleaching. The findings we disclose here help to clarify previous ECF optimization studies of conventional softwood kraft pulps.

scholarly journals Cellulose Nanofibril (CNF) Films and Xylan from Hot Water Extracted Birch Kraft Pulps

2019 ◽  
Vol 9 (16) ◽  
pp. 3436 ◽  
Author(s):  
Marc Borrega ◽  
Hannes Orelma
Keyword(s):  
Food Packaging ◽  
Kraft Pulp ◽  
Barrier Properties ◽  
Hot Water ◽  
Kraft Pulps ◽  
Cellulose Nanofibril ◽  
Vapour Permeability ◽  
Transparent Films ◽  
Cnf Films ◽  
Birch Kraft Pulp

The effects of xylan extraction from birch kraft pulp on the manufacture and properties of cellulose nanofibril (CNF) films were here investigated. Hot water extractions of bleached and unbleached kraft pulps were performed in a flow-through system to remove and recover the xylan. After the extraction, the pulps were oxidized with 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) and fibrillated in a high-pressure microfluidizer. Compared to CNF from bleached kraft pulp, the CNF dispersions obtained from water-extracted pulps were less viscous and generally contained a higher amount of microfiber fragments, although smaller in size. In all cases, however, smooth and highly transparent films were produced from the CNF dispersions after the addition of sorbitol as plasticizer. The CNF films made from water-extracted pulps showed a lower tensile strength and ductility, probably due to their lower xylan content, but the stiffness was only reduced by the presence of lignin. Interestingly, the CNF films from water-extracted bleached pulps were less hydrophilic, and their water vapour permeability was reduced up to 25%. Therefore, hot water extraction of bleached birch kraft pulp could be used to produce CNF films with improved barrier properties for food packaging, while obtaining a high-purity xylan stream for other high-value applications.

Optimization of chemical and enzymatic deinking of photocopier waste paper

BioResources ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 447-463 ◽  
Author(s):  
Puneet Pathak ◽  
Nishi K. Bhardwaj ◽  
Ajay K. Singh
Keyword(s):  
Physical Properties ◽  
Removal Efficiency ◽  
Strength Properties ◽  
Waste Paper ◽  
Cellulase Enzyme ◽  
Tensile Index ◽  
Drainage Time ◽  
Tear Index ◽  
The World ◽  
Better Than

The utilization of post-consumer papers in the production of new paper products is increasing all over the world in recent years. Recycling of photocopier paper is a major problem due to difficulty in removal of non-impact ink. Enzymes offer potential advantages in ecofriendly deinking of recovered paper. In this study the deinking of photocopier paper was examined using chemicals and a commercial cellulase enzyme. Parameters of deinking experiments were optimized for hydrapulping. The ink was removed by flotation and washing processes. Then these parameters were compared in terms of ink removal ability of the process, as well as optical and strength properties of the deinked paper. The application of enzymatic deinking improved ink removal efficiency by 24.6% and freeness by 21.6% with a reduction in drainage time of 11.5% in comparison to those obtained with chemical deinking. The physical properties, namely burst index and tensile index, were observed to improve by 15.3% and 2.7%, respectively and brightness and tear index decreased by 2.1% and 21.9%, respectively. Results of deinking efficiency of photocopier paper showed that the enzyme used in the present work performed better than the conventional chemicals used for deinking.

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