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.

Influence of Cellulase to Filtration and Fiber Morphology of Bleached Softwood Pulp

2012 ◽  
Vol 550-553 ◽  
pp. 1182-1185
Author(s):  
Min Du ◽  
Xin Ping Li ◽  
Meng Luo
Keyword(s):  
Mode Of Action ◽  
Fiber Length ◽  
Fiber Surface ◽  
Cellulose Hydrolysis ◽  
Enzymatic Treatment ◽  
Polymerization Degree ◽  
Fiber Morphology ◽  
Softwood Pulp ◽  
Before And After ◽  
Enzyme Dosage

Cellulase named as Celluclast 1.5L was used to deal with bleached softwood pulp. By analyzing the changes of fiber polymerization, fiber length and pulp freeness before and after enzymatic treatment, studied the influence of cellulase to filtration and fiber morphology of bleached softwood pulp, and discussed the mode of action of cellulase to bleached softwood pulp. The results show that while the enzyme dosage increasing, the degree of cellulose hydrolysis increases; the pulp polymerization degree decreases; fiber length decreases and the content of fines increase. Pulp filtration first increases and then decreases, but fiber surface does not appear the phenomenon of fibrillating. It indicates that the action of cellulase to fiber is from the inside to outside.

Influences of Bleached Softwood Pulp Pretreated with Endo-Cellulase on Fiber Surface Properties and Aggregation Structure

2011 ◽  
Vol 391-392 ◽  
pp. 692-696
Author(s):  
Min Du ◽  
Xin Ping Li ◽  
Wu Guang Li
Keyword(s):  
Energy Consumption ◽  
Fiber Surface ◽  
Paper Sheet ◽  
Paper Properties ◽  
Enzymatic Pretreatment ◽  
Wetting Properties ◽  
Tear Index ◽  
Softwood Pulp ◽  
Aggregation Structure ◽  
Refining Performance

The influences of endo-cellulase pretreatment of bleached softwood pulp before refining was investigated in this paper. Refining energy consumption, paper properties, wetting properties, electric charge and aggregation structure of fiber were investigated. The results showed that pretreated with endo-cellulase at the dosage of 0.4ECG/g before refining could increase the refining degree by 53.09%, and it would reduce refining energy consumption significantly. At this dosage, the tensile index of the paper sheet increased while the tear index of paper sheet decreased slightly. Additionally, enzymatic pretreatment could raise fiber surface wettability, lower the absolute value of Zeta potential and decrease the crystallinity of fiber, which was help to improve refining performance.

scholarly journals Preparation and Application of Cationic Modified Cellulose Fibrils as a Papermaking Additive

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Yanhong Gao ◽  
Qun Li ◽  
Yu Shi ◽  
Ruitao Cha
Keyword(s):  
Zeta Potential ◽  
Chemical Properties ◽  
Cationic Starch ◽  
Physical Strength ◽  
Tensile Index ◽  
Tear Index ◽  
Colloid Titration ◽  
Cellulose Fibrils ◽  
Physical And Chemical ◽  
Modified Cellulose

This paper deals with cationic modified cellulose fibrils obtained by reacting the cellulose fibrils with 2,3-epoxypropyltrimethylammonium chloride (EPTMAC). The physical and chemical properties of unmodified cellulose fibrils (UMCF) and cationic modified cellulose fibrils (CMCF) were characterized by SEM, FTIR, degree of substitution, colloid titration, zeta potential, and thermogravimetric analysis. The experimental results showed that, after cationization, surface charge density and zeta potential reversed, thermal stability decreased, and new functional groups appeared, while the surface morphology did not show much difference from the UMCF. With the addition of three kinds of additives (UMCF, CMCF, and cationic starch (CS)) to BCTMP, the addition of UMCF and CMCF had little effect on zeta potential, while the addition of CS changed zeta potential obviously. With the increasing of additive amount, the bulk of paper sheets added CMCF did not change obviously, while the bulk of paper sheets added UMCF and CS decreased rapidly. With regard to physical strength, all the three kinds of additives could improve the tensile index and tear index; the tensile index of paper sheets added CS was higher than that of added UMCF and CMCF, while the tear index of paper sheets added CMCF was the highest among the three additives.

Influence of Cellulase to Aggregation Structure of Bleached Softwood Pulp

2012 ◽  
Vol 549 ◽  
pp. 255-259
Author(s):  
Min Du ◽  
Xin Ping Li ◽  
Zhi Min Yao
Keyword(s):  
Water Retention ◽  
Enzymatic Treatment ◽  
Crystalline Region ◽  
Water Retention Value ◽  
Softwood Pulp ◽  
Aggregation Structure ◽  
Enzyme Dosage

Cellulase named as Celluclast 1.5L was used to deal with bleached softwood pulp. By analyzing the changes of water retention value and crystallinity of fiber after enzymatic treatment, studied the influence of cellulase to aggregation structure of bleached softwood pulp. The results show that with the increasing of the enzyme dosage, the proportion of long-fiber decreases and the content of fines increases. Water retention value of pulp first decreases and then increases. The fiber crystal does not change with the enzymatic treatment, but with the increasing of the enzyme dosage, the crystallinity of fiber first increases and then decreases. It indicates that the cellulase would act on the crystalline region of fiber in the higher enzyme dosage.

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.

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.

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 Aplikasi Lakase pada Proses Refining Pulp

2019 ◽  
Vol 9 (02) ◽  
pp. 65
Author(s):  
Hendro Risdianto ◽  
Sonny Kurnia Wirawan ◽  
Susi Sugesty
Keyword(s):  
Reaction Rate ◽  
Refining Process ◽  
Enzyme Treatment ◽  
Paper Strength ◽  
Tensile Index ◽  
Tear Index ◽  
Acacia Crassicarpa

Refining merupakan proses untuk memodifikasi serat dengan tujuan meningkatkan ikatan serat dan mengembangkan kekuatan kertas. Penelitian yang telah dilakukan meliputi penentuan kondisi refining dengan PFI Mill dan penentuan kondisi perlakuan awal lakase yang selanjutnya akan diterapkan pada proses biorefining. Jumlah putaran 2500 dari PFI mill merupakan jumlah yang optimum untuk menghasilkan kekuatan pulp Acacia crassicarpa. Sedangkan hasil penelitian kondisi optimum lakase menunjukkan bahwa lakase memiliki laju reaksi yang paling tinggi (0,0018 mM/s) pada suhu 50°C. Pada proses refining, freeness awal pulp adalah sekitar 550 mL CSF, dan ketika dikenakan perlakuan lakase turun menjadi 515 (LMS1) dan 520 (LMS2). Refining pulp tanpa perlakuan enzim menghasilkan indeks tarik, retak dan sobek berturut-turut adalah 6,4.10-2 kNm/g, 5,18 kPa.m2/g, dan 5,96 mN.m2/g. Indeks sobek tidak mengalami perubahan signifikan pada semua perlakuan. Perlakuan LMS1 meningkatkan indeks tarik menjadi 6,83 kNm/g dan indeks sobek menjadi 7,53 mN.m2/g. Indeks tarik dan sobek pada LMS2 menurun dibandingkan LMS1, namun masih lebih tinggi dibandingkan tanpa perlakuan. Dengan demikian perlakuan lakase pada proses refining dapat meningkatkan indeks tarik dan indeks sobek lembaran.Laccase Application in Pulp Refining Process AbstractRefining is a process to modify fibers with the aim of increasing fiber bonds and developing paper strength. The research that has been done includes determining the refining conditions with PFI Mill and determining the conditions of pretreatment of laccase which will then be applied to the biorefining process. The PFI mill revolutions of 2500 is the optimum to produce the strength of the Acacia crassicarpa pulp. Whereas the results of the study showed that optimum laccase conditions showed that laccase had the highest reaction rate (0.0018 mM/s) at 50oC. In the refining process, the initial freeness of the pulp is around 550 mL CSF, and when subjected to laccase treatment it drops to 515 (LMS1) and 520 (LMS2). Refining the pulp without enzyme treatment produced tensile, bursting and tearing indexes of 6.4.10-2 kNm/g, 5.18 kPa.m2/g, and 5.96 mN.m2/g, respectively. The tear index did not change significantly in all treatments. The LMS1 treatment increased the tensile index to 6.83 kNm/g and the tear index to 7.53 mN.m2/g. The tensile and tear index in LMS2 decreased compared to LMS1, but it was still higher than without treatment. Thus, laccase treatment in the refining process can increase the tensile index and tear indexof the sheet.  

Relation of Cotton Fiber Properties to Sliver Cohesion

1977 ◽  
Vol 47 (11) ◽  
pp. 755-760 ◽  
Author(s):  
Reba Lawson ◽  
Smith Worley ◽  
H. H. Ramey
Keyword(s):  
Fiber Length ◽  
Stepwise Regression ◽  
Statistical Evaluation ◽  
Fiber Surface ◽  
Cohesive Force ◽  
Independent Variables ◽  
Fiber Properties ◽  
Positive Correlations ◽  
Relationship Of ◽  
The Relationship

A statistical evaluation was made of the relationship of certain fiber properties to cohesive force and coefficient of variation of cohesive force. Significant positive correlations were found between the cohesive force and fiber length, tenacity, and fiber yellowness (+b); negative correlations were found with fiber perimeter and reflectance (Rd). When length, colorimeter values, and Micronaire readings were used as independent variables in a stepwise regression program, 53% of the variation in the cohesive force could be explained by upper half mean length and Rd. The addition of other fiber properties whose measurement was influenced by fiber surface properties increased the explainable variation in the cohesive force to 71%.

scholarly journals Potensi Penggunaan Dua Spesies Agave untuk Pembuatan Pulp dan Kertas

2018 ◽  
Vol 8 (01) ◽  
pp. 43
Author(s):  
Arini Hidayati Jamil ◽  
Heronimus Judi Tjahjono ◽  
Parnidi Parnidi ◽  
Marjani Marjani
Keyword(s):  
Physical Properties ◽  
Pulp And Paper ◽  
Raw Material ◽  
National Standard ◽  
Chemical Components ◽  
Pulp Yield ◽  
Fiber Morphology ◽  
Tensile Index ◽  
Tear Index ◽  
Agave Sisalana

Potential of Two Agave Species for Pulp and Paper MakingAbstractBoth of Agave sisalana and A. cantala are the most favorite agave species for fiber producer plant in Indonesia. Nevertheless, research study for using fiber of A. sisalana and A. cantala for pulp and paper purpose is hard to find. This study aims to observe the characteristics of A. sisalana and A. cantala fibers as a raw material of pulp including fiber morphology, chemical components, pulp characteristics, optical and physical properties of the handsheets. The observation of all characters was based on Indonesian National Standard (SNI). The pulping method used both of soda process with 18% active alkali and kraft process with 18% active alkali and 25% sulfidity. The result of the study for the handsheets from A. sisalana and A. cantala fibers shows that the brightness, dirt, and tear index were fulfilled to SNI standard for NBKP while the tensile index and burst index just fulfilled to SNI standard for LBKP. The handsheet of A. sisalana fiber has a higher tear index, tensile index, and burst index than the A. cantala ones. Soda pulping of both agave species resulting higher pulp yield, cellulose polymerization degrees and physical properties than kraft pulping.Keywords : Agave sisalana, A. cantala, characteristics of the fiber, pulp AbstrakAgave sisalana dan A. cantala merupakan dua spesies agave yang paling banyak dibudidayakan di Indonesia sebagai tanaman penghasil serat alam. Namun penelitian mengenai fungsi serat A. sisalana dan A. cantala sebagai bahan baku pulp dan kertas masih sulit ditemukan. Tujuan dari penelitian ini adalah mempelajari karakteristik serat A. sisalana dan A. cantala sebagai bahan baku pulp yang meliputi morfologi serat, komposisi komponen kimia, karakeristik pulp, sifat optik dan fisik lembaran pulp yang dihasilkan. Pengamatan seluruh karakter dilakukan berdasarkan Standar Nasional Indonesia. Pemasakan menggunakan metode soda dengan alkali aktif 18% dan kraft dengan alkali aktif 18% dan sulfiditas 25%. Hasil pengamatan pada lembaran pulp yang dihasilkan dari serat A. sisalana dan A. cantala menunjukkan bahwa derajat cerah, noda, dan kekuatan sobek memenuhi Standar Nasional Indonesia (SNI) Pulp Kraft Putih Kayujarum (NBKP) sementara kekuatan tarik dan kekuatan retak memenuhi SNI Pulp Krat Putih Kayudaun (LBKP). Lembaran pulp A. sisalana memiliki kekuatan sobek, tarik, dan retak lebih tinggi dibanding lembaran pulp A. cantala. Metode pemasakan soda pada serat kedua spesies agave tersebut menghasilkan rendemen pulp, derajat polimerisasi selulosa, dan kekuatan fisik lebih baik dibanding metode kraft.Kata kunci : Agave sisalana, A. cantala, karakteristik serat, pulp 

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