Research on Biological Modification of Pulp to Improve the Strength of Paper

2013 ◽  
Vol 848 ◽  
pp. 334-337
Author(s):  
Ai Yun Long ◽  
Chuan Shan Zhao ◽  
Wen Jia Han ◽  
Yi Fei Jiang
Keyword(s):  
Control Sample ◽  
Strength Properties ◽  
Raw Material ◽  
Paper Strength ◽  
Optimum Conditions ◽  
Wet Strength ◽  
Tensile Index ◽  
Pulp Consistency ◽  
Pulp Properties ◽  
Biological Modification

Based on the domestic OCC pulp as raw material, it was found that the optimum conditions for laccase treatment were: the concentration of laccase 16U/g dry pulp, the pulp consistency 5%, temperature 50 °C, pH=5.0 and reaction time 90min. OCC treated with laccase alone can improve paper strength properties. The dry tensile index and wet tensile index of the control sample were 21.80 Nm/g and 0.22 Nm/g, respectively. The dry tensile index and wet tensile index after OCC treated with laccase alone were 23.36 Nm/g and 0.28 Nm /g. Comparing to the control pulp, the dry tensile index and wet tensile index of OCC treated with laccase were increased by 6.88% and 27.3%, respectively. At the same time, the laccase system can obviously improve the strength of the pulp properties with adding the mediator, especially using histidine, the dry and wet strength of paper was largely improved.

Research on Biological and Mechanical Modification of Pulp to Improve the Strength of Paper

2013 ◽  
Vol 848 ◽  
pp. 330-333
Author(s):  
Ai Yun Long ◽  
Chuan Shan Zhao ◽  
De Gui Li ◽  
Yi Fei Jiang ◽  
Wen Jia Han
Keyword(s):  
Biological Treatment ◽  
Fiber Surface ◽  
Strength Properties ◽  
Environmental Scanning ◽  
Paper Strength ◽  
Optimum Conditions ◽  
Scanning Microscope ◽  
Carboxyl Content ◽  
Pulp Consistency ◽  
Pulp Strength

By the preceding experiments, we concluded that the optimum conditions for laccase treatment were: the concentration of laccase 16U/g dry pulp, the pulp consistency 5%, temperature 50 °C, pH=5.0 and reaction time 90min. We studied the change of water retention value and carboxyl content changes under the best conditions. As well as we studied the effect of pulp strength properties by biological treatment combined with mechanical treatment. Moreover, environmental scanning microscope images showed that more collapse and more fibrillation were observed on the beating combined with laccasehistidine-treated fiber surface than the control samples, which led to form better bonding between fibers in handsheets resulting in the increase of the paper strength of beating combined with laccasehistidine-treated OCC pulp.

scholarly journals TMP properties and refining conditions in a CD82 chip refiner. Part I: Step changes of process variables, description of the tests

2018 ◽  
Vol 33 (1) ◽  
pp. 69-81
Author(s):  
Rita Ferritsius ◽  
Olof Ferritsius ◽  
Jan Hill ◽  
Anders Karlström ◽  
Karin Eriksson
Keyword(s):  
Specific Energy Consumption ◽  
Fibre Length ◽  
Thermomechanical Pulp ◽  
Process Variables ◽  
Negative Effects ◽  
Entropy Model ◽  
Tensile Index ◽  
Pulp Consistency ◽  
Pulp Properties ◽  
Flat Zone

Abstract The study explores how changes in process variables, residence time and pulp consistency in refining influence the pulp properties. The equipment utilized in this study was a conical disc chip refiner (RGP82CD) producing thermomechanical pulp (TMP). The focus was on the ratio between tensile index and specific energy consumption. Pulp properties were measured for composite pulp samples taken from the refiner blow line. Residence times and pulp consistencies were estimated by use of the extended entropy model. This showed that the CD-refiner, with the flat and conical refining zone, has a process performance similar to that of a two-stage refiner set-up, and that the consistency in both refining zones is of high importance. Comparing different periods revealed that even if the values of measured blow line consistency are similar, significant differences in the estimated consistency in the flat zone can prevail. Therefore, only monitoring blow line consistency is not enough. Specifically, it was found that the pulp consistency after the flat zone could be very high, considerably higher than in the blow line, and this could have negative effects on tensile index and fibre length.

scholarly journals PENINGKATAN MUTU KERTAS DAUR ULANG MENGGUNAKAN XYLAN ( IMPROVEMENT QUALITY OF RECYCLED FIBER USING XYLAN )

2017 ◽  
Vol 7 (01) ◽  
pp. 33
Author(s):  
Sonny Kurnia Wirawan ◽  
Chandra Apriana Purwita ◽  
Nina Elyani
Keyword(s):  
Agricultural Waste ◽  
Strength Properties ◽  
Paper Strength ◽  
Tensile Index ◽  
Potential Source ◽  
Recycled Fiber ◽  
Corrugated Cardboard

ABSTRACTCorncob as agricultural waste is a potential source of xylan to be used as an additive to increase the paper strength sheets originating from old corrugated cardboard (OCC). The aim of this research is to know increasing of strength properties from recycled fiber after addition of corncob xylan, compared to the commercial xylan. The xylan extraction was carried out by acid and the addition of xylan to the fiber was carried out at 80 ºC for 30 minutes. The results showed that the use of corncob xylan 5% (w/w) can increase the tensile index by 13.08%, burst index by 9.24%, ring crush test (RCT) index by 39.13% and corrugated medium test (CMT) index by 17.44%.ABSTRAKTongkol jagung sebagai limbah pertanian merupakan sumber xylan yang potensial yang dapat digunakan sebagai aditif untuk meningkatkan kekuatan lembaran kertas daur ulang yang berasal dari Kertas Karton Gelombang (KKG) bekas. Tujuan penelitian ini adalah untuk mengetahui peningkatan kekuatan lembaran kertas daur ulang setelah penambahan xylan dari tongkol jagung, dibandingkan dengan xylan komersial. Ekstraksi xylan dilakukan dengan metode asam dan penambahan xylan terhadap serat dilakukan pada temperatur 80ºC selama 30 menit. Hasil penelitian menunjukkan bahwa penggunaan xylan tongkol jagung sebanyak 5% (berat xylan/berat kering pulp) dapat meningkatkan indeks tarik 13,08%, indeks retak 9,24%, indeks RCT 39,13% dan indeks CMT 17,44%.

Effect of nanofibrillated cellulose made from enzyme-pretreated bamboo pulp on paper strength

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 964-978
Author(s):  
Hae Min Jo ◽  
Ji Young Lee ◽  
Su Ho Kim ◽  
Yeon Hui Lee
Keyword(s):  
Physical Properties ◽  
Kraft Pulp ◽  
Nanofibrillated Cellulose ◽  
Raw Material ◽  
Paper Strength ◽  
Strength Enhancement ◽  
Tensile Index ◽  
Similar Improvement ◽  
Bamboo Pulp ◽  
Enzyme Pretreatment

The applicability of bleached bamboo kraft pulp (Ba-BKP) was explored as a raw material for the manufacture of nanofibrillated cellulose (EN-NFC) made of enzyme-pretreated pulps and the effects of the EN-NFC on enhancing paper strength. The Ba-BKP was pretreated using an endo-glucanase enzyme at 50 °C and pH 6, after which the EN-NFC was made by micro-grinding. Bleached hardwood kraft pulp (Hw-BKP) was used as a control, and the non-enzymatic refining pretreatment of BKPs was compared with the enzyme pretreatment. The EN-NFC was incorporated into handsheets, and the sheet strengths were measured. The physical properties of the NFC made from the Ba-BKP were similar to those made from the Hw-BKP. The NFC prepared following enzyme pretreatment were smaller and more uniform than those pretreated with refining. The EN-NFC made from the Ba-BKP was effective at enhancing tensile index by 52.7%, and burst index by 210.2% when 2% of EN-NFC was added in the furnish, and those of handsheets containing the EN-NFC made from Hw-BKP showed the similar improvement. Therefore, Ba-BKP can be used as a raw material for the manufacture of EN-NFC that confers similar physical properties and strength enhancement to paper as those made from Hw-BKP.

scholarly journals Bleached kraft pulp production from Pinus tecunumanii (Eguiluz e Perry)

2005 ◽  
Vol 29 (3) ◽  
pp. 489-494 ◽  
Author(s):  
Leonel F. Torres ◽  
Roberto Melo ◽  
Jorge Luiz Colodette
Keyword(s):  
Kraft Pulp ◽  
Strength Properties ◽  
Kappa Number ◽  
Raw Material ◽  
Kraft Pulps ◽  
Optimum Conditions ◽  
Oxygen Delignification ◽  
Bleached Kraft Pulp ◽  
Pinus Tecunumanii ◽  
Pulp Production

The use of 12-year-old Pinus tecunumanii (Eguiluz e Perry) grown in Colombia was evaluated for bleached kraft pulp production. Kraft pulps of kappa number 30 ± 1 were produced, and oxygen delignified and bleached to 90% ISO with ECF processes. The bleached pulps produced under optimum conditions were evaluated with regard to their strength properties. Pinus tecunumanii wood required low effective alkali charge to reach the desired kappa number and the unbleached pulp showed high oxygen delignification efficiency and bleachability when a OD(EO)DED sequence was used. The bleached pulps presented good physical-mechanical properties, which are comparable to those obtained with more traditional pines such as Pinus taeda and Pinus radiata. The results demonstrate that this tropical pine species is a suitable raw material for bleached kraft pulp production

Circular action treatment (CAT): a new strategy for mechanical treatment of old corrugated container III

2019 ◽  
Vol 34 (3) ◽  
pp. 362-370
Author(s):  
Jin-Doo Kim ◽  
Tai-Ju Lee ◽  
Jae-Hoon Lee ◽  
Jeong-Yong Ryu ◽  
Jong-Myoung Won
Keyword(s):  
Paper Mill ◽  
Mechanical Action ◽  
Strength Properties ◽  
Raw Material ◽  
Paper Strength ◽  
Mill Scale ◽  
Fiber Properties ◽  
Higher Power ◽  
Strength Based ◽  
New Strategy

Abstract OCC have been the most important raw material for production of papers for industrial grades. The quality of OCC fibers have been deteriorated by repeated recycling process. In order to overcome the defects of OCC CAT has been developed as a new strategy for old corrugated container (OCC), which could generate mild mechanical action. The effect of CAT was proven through the previous researches which showed the increase of the fiber properties, such as WRV, freeness, and strength properties, and positive effect on paper strength. Based on the results, mill-scale application of CAT was performed at a linerboard mill located in Republic of KOREA. In this paper, mill-scale CAT was designed with higher power and dimension compared to the previous lab-scale CAT, which was equipped at the screw press outlet in a papermaking process. Fiber properties, final product quality, and energy consumption were analyzed with the installation of mill-scale CAT. Freeness and WRV were improved with an increase of passing time, and mean fiber length was constant simultaneously. In terms of process runnability, there was no problem during the test. Furthermore the outstanding achievement was found that the energy could be saved using CAT by around 30 % compared to double-disc low-consistency refining. Consequently CAT could be a new alternative for treatment of OCC without any troubles.

scholarly journals The use of a PAE /bentonite binary system to improve the wet strength of paper

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8449-8458
Author(s):  
Shuai-Bo Liang ◽  
Xiao Ning ◽  
Qing-Jin Fu ◽  
Qian Liu ◽  
Chun-Li Yao
Keyword(s):  
Binary System ◽  
Water Retention ◽  
Control Sample ◽  
Water Retention Value ◽  
Wet Strength ◽  
Tensile Index ◽  
Folding Endurance ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Scanning Electron

Bentonite and polyamidoamine epichlorohydrin (PAE) resin were added sequentially as a binary system to improve the properties of the paper, especially the wet strength. The results showed that the dry tensile index, the wet tensile index, and the folding endurance of the paper could be improved with only the use of polyamide polyamine epichlorohydrin resin. However, a binary system of polyamide polyamine epichlorohydrin resin and bentonite was more effective. When 0.8% polyamide polyamine epichlorohydrin resin and 0.75% bentonite were added, the dry tensile index, the wet tensile index, and the folding endurance of the paper increased by 37.8%, 2780%, and 281%, respectively, when compared to the control sample. The measurements of the water retention value and the percent fines retention of the pulp showed higher values after being treated with the binary system than being treated by polyamide polyamine epichlorohydrin resin alone. Scanning electron microscopy analysis indicated that a binary system of polyamide polyamine epichlorohydrin resin and bentonite could increase the combination of fibers in paper.

scholarly journals Paper Strength Development with Beating and Polyamideamine-epichlorohydrin (PAE)

2016 ◽  
Vol 1 (3) ◽  
pp. 123
Author(s):  
Maria Ulfa ◽  
Bambang Setiaji ◽  
Wega Trisunaryanti ◽  
Triyono Triyono
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Strength Development ◽  
Paper Strength ◽  
Wet Strength

Thecharacter of coir handsheets prepared with beating and addition of polyamideamine-epichlorohydrin (PAE) was investigated. Pulp coir from soda-anthraquinone pulping was used as raw material for manufacture of coir handsheets. Physical and mechanical properties obtained with different beating level and PAE dosage were measured. The addition of PAE 10% w/w and beating on pulp stock of 3000 rev increased grammage and density at 1.9 and 15.8%, respectively. Instead it decreased thickness by 15.8%. Addition PAE dosage of 10% w/w at 10000 rev improved the density, but decreased the porosity and Cobb<sub>60</sub> at 5.8; 10.2; and 19 %, respectively. The highest   dry and wet tensile were obtained at 20 % w/w of PAE. Combination of  beating and addition of PAE on pulp stock formed wet-strength handsheets with range between 28.0 to 34.2%.

Improving paper wet strength via increased lignin content and hot-pressing temperature

TAPPI Journal ◽  
2020 ◽  
Vol 19 (10) ◽  
pp. 487-497
Author(s):  
TOVE JOELSSON ◽  
GUNILLA PETTERSSON ◽  
SVEN NORGREN ◽  
ANNA SVEDBERG ◽  
HANS HOGLUND ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Lignin Content ◽  
Pilot Scale ◽  
Strength Properties ◽  
High Yield ◽  
Kraft Pulps ◽  
Pressing Temperature ◽  
Wet Strength ◽  
Tensile Index ◽  
Reference Samples

It is known that the strength properties of wood-based paper materials can be enhanced via hot-pressing techniques. Today, there is a desire not only for a change from fossil-based packaging materials to new sustainable bio-based materials, but also for more effective and eco-friendly solutions for improving the dry and wet strength of paper and board. Against this background, hot pressing of paper made from high yield pulp (HYP), rich in lignin, becomes highly interesting. This study investigated the influence of pressing temperature and native lignin content on the properties of paper produced by means of hot pressing. Kraft pulps of varied lignin content (kappa numbers: 25, 50, 80) were produced at pilot scale from the same batch by varying the cooking time. We then studied the effect of lignin content by evaluating the physical properties of Rapid Köthen sheets after hot pressing in the temperature range of 20°C–200°C with a constant nip pressure of 7 MPa. The pilot-scale cooked pulps were compared with reference samples of mill-produced northern bleached soft-wood kraft (NBSK) pulp and mill-produced chemithermomechanical pulp (CTMP). Generally, the results demonstrated that lignin content had a significant effect on both dry and wet tensile index. All of the pilot cooked pulps with increased lignin content had a higher tensile index than the reference NBSK pulp. To obtain high tensile index, both dry and wet, the pressing temperature should be set high, preferably at least 200°C; that is, well above the glass transition temperature (Tg) for lignin. Moreover, the lignin content should preferably also be high. All kraft pulps investigated in this study showed a linear relationship between wet strength and lignin content.

Using PVA and PVA & Cationic Starch to Improve the Strength of High-Yield Pulp

2014 ◽  
Vol 496-500 ◽  
pp. 167-170
Author(s):  
Yun Yun Sun ◽  
Fan Gong Kong ◽  
Shou Juan Wang ◽  
Qin Wu
Keyword(s):  
Strength Properties ◽  
High Yield ◽  
Cationic Starch ◽  
Physical Strength ◽  
Pulp Consistency ◽  
Promising Application ◽  
Pulp Properties

Dry strength additives play an important roll in papermaking process. In this work, we aimed at analyzing the performance of poly vinyl alcohols (PVA) and PVA & cationic starch (CS), as dry strength additives, on the properties of high-yield pulp (HYP). Various dosages of PVA were applied on HYP under various conditions and the corresponding pulp properties were evaluated. It was observed that PVA increased the strength properties of the HYP significantly, and the enhanced strength properties can be kept even after refining, which gave a promising application of this method in conventional pulping process. The best conditions of PVA for dosage, pH, pulp consistency and time was 20 mg/g, 6.0, 3% and 10 min, respectively. The application of CS, combined with PVA, can further improve the final physical strength properties of HYP. The results obtained from using PVA & CS were more effective than those obtained from using only PVA.

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