Pengaruh Kinerja Endoglukanase Terhadap Pembentukan Fibrilasi Serat Bahan Baku Kertas Tisu Towel

Nurul Ajeng Susilo; Devi Kilisuci; Is Helianti

doi:10.36870/jvti.v3i1.212

Pengaruh Kinerja Endoglukanase Terhadap Pembentukan Fibrilasi Serat Bahan Baku Kertas Tisu Towel

JURNAL VOKASI TEKNOLOGI INDUSTRI (JVTI) ◽

10.36870/jvti.v3i1.212 ◽

2021 ◽

Vol 3 (1) ◽

Author(s):

Nurul Ajeng Susilo ◽

Devi Kilisuci ◽

Is Helianti

Keyword(s):

Kraft Pulp ◽

Virgin Pulp

Bahan baku kertas tisu merupakan virgin pulp yang terdiri dari serat NBKP (Needle Bleach Kraft Pulp) dan serat LBKP (Leaf Bleach Kraft Pulp). Tujuan dilakukannya penelitian ini adalah untuk mengetahui pengaruh penambahan enzim terhadap nilai freeneess serta meninjau sifat fisik kertas tisu yang dihasilkan. Pada penelitian ini dilakukan perbandingan tanpa perlakuan enzim (Blank) dan menggunakan penambahan enzim yaitu enzim endoglukanase.Masing - masing enzim divariasikan dosis penggunaannya 0 ppm, 300 ppm, 400 ppm, 500 ppm. Kemudian divariasikan waktu beaternya 0 menit, 15 menit, 20 menit. Penambahan enzim dilakukan sebelum beater. Kondisi enzim saat akan ditambahkan berkonsistensi 1% sedangkan kondisi subtrat (serat) konsistensi 1.56% suhu 40 - 60oC. Dengan variasi pencampuran bahan baku LBKP : NBKP yaitu 70%:30%. Hasil penelitian menunjukan dengan penambahan enzim endoglukanase didapat hasil yang baik yaitu dapat menurunkan nilai freeness LBKP sebesar 16% kemudian freeness NBKP turun sebesar 22%. Berdasarkan hasil penelitian penggunaan enzim endoglukanase dapat meningkatkan beberapa sifat fisik kertas tisu seperti porosity, dry tensile.

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KARAKTERISTIK PULP KIMIA MEKANIS DARI KENAF (Hibiscus cannabinus L.) UNTUK KERTAS LAINER

JURNAL SELULOSA ◽

10.25269/jsel.v4i01.55 ◽

2016 ◽

Vol 4 (01) ◽

Author(s):

Teddy Kardiansyah ◽

Susi Sugesty

Keyword(s):

Kraft Pulp ◽

Sodium Hydroxide Solution ◽

Strength Properties ◽

Hibiscus Cannabinus ◽

Paper Strength ◽

Physical Strength ◽

Tear Index ◽

Virgin Pulp ◽

Kenaf Bast ◽

Crush Strength

Liner paper is commonly used for packaging because of its high bursting and ring crush strength. To meet these properties, liner paper strength relies on about 10-40% content of NUKP (Needle Unbleached Kraft Pulp). Currently, Indonesia does not produce NUKP, so it must be imported and the price is expensive. Liners paper in Indonesia is usually made from waste paper (old corrugated containers) that has unacceptable strength properties. To improve the strength properties, virgin pulp should be used. This study aimed to make virgin pulp from kenaf by chemimechanical process. Its physical strength was tested as a NUKP substitute. The results show that Kenaf mechanical pulp from Kenaf bast treated by using 6% sodium hydroxide solution fulfills the NUKP specifications according to SNI- 6106-1999, i.e. a fiber length of 4.24 mm, a freeness of 760 mL CSF, a tensile index of 66.54 Nm/g, a burst index of 5.72 kPam2/g, and a tear index of 18.09 mNm2/g.Keywords: nonwood, chemimechanical pulp, kenaf, bast, core ABSTRAK Kertas lainer merupakan kertas industri yang digunakan untuk kemasan, dengan sifat ketahanan retak dan ketahanan tekan lingkar (ring crush) yang tinggi. Untuk mendapatkan kedua sifat tersebut maka biasanya kekuatan kertas lainer bertumpu pada penggunaan NUKP (pulp kraft serat panjang belum putih) dengan proporsi sekitar 10 – 40%. Saat ini Indonesia tidak memproduksi NUKP sehingga kebutuhan NUKP harus diimpor dan harganya mahal. Kertas lainer di Indonesia pada saat ini hampir semuanya dibuat dari karton bekas, disamping itu pengolahan karton bekas memiliki masalah pada kekuatan lembaran. Jika pembuatan karton menggunakan serat asli (virgin pulp), maka masalah kekuatan lembaran dapat diatasi. Penelitian ini bertujuan untuk membuat pulp dari Kenaf dengan proses kimia mekanis. Bahan baku nonkayu yaitu kenaf dibuat pulp mekanis dengan menggunakan proses Chemimechanical Pulp (CMP). Selanjutnya pulp mekanis yang diperoleh diuji kekuatan fisiknya untuk melihat potensinya sebagai pulp NUKP. Pulp mekanis kenaf yang berasal dari kulit kenaf dengan penggunaan natrium hidroksida (NaOH) 6% telah memenuhi spesifikasi pulp NUKP sesuai dengan SNI 6106-1999, yaitu panjang serat 4,24 mm, freeness 760 mL CSF, indeks tarik 66,54 Nm/g, indeks retak 5,72 kPam2/g dan indeks sobek 18,09 mNm2/g.Kata kunci: non kayu, pulp kimia mekanis, kenaf, kulit, batang tanpa kulit

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

TAPPI Journal ◽

10.32964/tj11.6.31 ◽

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.

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Application of pure, thermostable, alkali-tolerant xylanase in bleaching of oxygen-delignified pine kraft pulp

TAPPI Journal ◽

10.32964/tj14.11.689 ◽

2015 ◽

Vol 14 (11) ◽

pp. 689-694

Author(s):

QINGZHI MA ◽

QI WANG ◽

CHU WANG ◽

NIANJIE FENG ◽

HUAMIN ZHAI

Keyword(s):

Intrinsic Viscosity ◽

Chlorine Dioxide ◽

High Purity ◽

Kraft Pulp ◽

Alkaline Media ◽

Industrial Scale ◽

Elemental Chlorine ◽

Effect Of Oxygen ◽

Alkaline Tolerant ◽

Ecf Bleaching

The effect of oxygen (O2)-delignified pine kraft pulp pretreatment by high-purity, thermostable, and alkaline-tolerant xylanases on elemental chlorine free (ECF) bleaching of O2-delignification kraft pulp was studied. The study found that xylanase pretreatment preserved the intrinsic viscosity and yield of O2-delignified pulp while causing about 7% of delignification with high delignification selectivity. The xylanases with high purity, higher thermostability (75°C~80°C) in highly alkaline media (pH 8.0~9.5) could be applied on an industrial scale. Pulp pretreatment by the high-purity, thermostable, and alkaline tolerant xylanases could improve pulp brightness or reduce the chlorine dioxide (ClO2) consumption. In a D0ED1D2 bleaching sequence using the same amount of ClO2, the xylanase-pretreated pulp obtained a higher brightness (88.2% vs. 89.7% ISO) at the enzyme dose of 2 U/g pulp; or for the same brightness as control (88.2% ISO), the ClO2 dosage in the D0 stage was reduced by 27%, which represents a 16% savings in total ClO2 used for bleaching.

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Comprehensive evaluation of kraft pulp properties from fast-growing woods

TAPPI Journal ◽

10.32964/tj9.6.34 ◽

2010 ◽

Vol 9 (6) ◽

pp. 34-39

Author(s):

AIYU QU ◽

YANHUI AO ◽

JUN YAN ◽

GUIGAN FANG

Keyword(s):

Kraft Pulp ◽

Comprehensive Evaluation ◽

Evaluation Model ◽

Evaluation Index System ◽

Evaluation Index ◽

Wood Cellulose ◽

Fuzzy Matrix ◽

Fast Growing ◽

Pulp Properties ◽

Evaluation Index Systems

To develop new wood cellulose resources and fast-growing pulpwood plantation fiber sources, it is very important to evaluate their pulping properties. A comprehensive multi-index pulping-suitability evaluation model is investigated in this paper by considering four fast-growing wood species. First, a new evaluation-index system for kraft pulp was developed based on traditional evaluation-index systems. Then, the membership degree of every index was analyzed to obtain a fuzzy matrix. The proportional contribution of each parameter to the main pulping properties could then be determined. Finally, a comprehensive evaluation model of kraft pulp properties was developed. The model is reliable compared with traditional assessment methods. The results confirmed the feasibility and rationality of developing new wood cellulose resources and fast-growing pulpwood plantations using fuzzy comprehensive evaluations.

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

TAPPI Journal ◽

10.32964/tj9.9.47 ◽

2010 ◽

Vol 9 (9) ◽

pp. 47-53 ◽

Cited By ~ 2

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.

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An effective method for determining the retention and distribution of cellulose nanofibrils in paper handsheets by dye labeling

TAPPI Journal ◽

10.32964/tj17.03.157 ◽

2018 ◽

Vol 17 (03) ◽

pp. 157-164 ◽

Cited By ~ 3

Author(s):

Shengdan Wang ◽

Wenhua Gao ◽

Kefu Chen ◽

Jinsong Zeng ◽

Jun Xu ◽

...

Keyword(s):

Correlation Coefficient ◽

Congo Red ◽

Kraft Pulp ◽

Cellulose Nanofibrils ◽

Standard Curve ◽

Congo Red Dye ◽

Mechanical Disintegration ◽

Softwood Kraft Pulp ◽

White Water ◽

Red Dye

Cellulose nanofibrils (CNF) were prepared by cellulase in conjunction with mechanical disintegration from the bleached softwood kraft pulp and labelled by Congo red dye. The labelled CNF were used to investigate the retention and distribution of CNF in paper handsheets. The retention of the labelled CNF was obtained by measuring the absorbance of white water using an ultraviolet-visible spectrophotometer. The results showed that this method for measuring the retention was rapid, feasible, and sensitive, owing to the high correlation coefficient R2 (0.9993) of the standard curve. The labelled CNF showed even distribution in paper handsheets. The colorimetric values of paper handsheets were explored with a residual ink analyzer.

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The solubility of calcium carbonate in green liquor handling systems

TAPPI Journal ◽

10.32964/tj18.10.595 ◽

2019 ◽

Vol 18 (10) ◽

pp. 595-602

Author(s):

ALISHA GIGLIO ◽

VLADIMIROS G. PAPANGELAKIS ◽

HONGHI TRAN

Keyword(s):

Calcium Carbonate ◽

Systematic Study ◽

Kraft Pulp ◽

Thermodynamic Simulation ◽

Solubility Data ◽

Pulp Mills ◽

Persistent Problem ◽

Green Liquor ◽

Kraft Pulp Mills ◽

Salt Systems

The formation of hard calcite (CaCO3) scale in green liquor handling systems is a persistent problem in many kraft pulp mills. CaCO3 precipitates when its concentration in the green liquor exceeds its solubility. While the solubility of CaCO3 in water is well known, it is not so in the highly alkaline green liquor environment. A systematic study was conducted to determine the solubility of CaCO3 in green liquor as a function of temperature, total titratable alkali (TTA), causticity, and sulfidity. The results show that the solubility increases with increased temperature, increased TTA, decreased causticity, and decreased sulfidity. The new solubility data was incorporated into OLI (a thermodynamic simulation program for aqueous salt systems) to generate a series of CaCO3 solubility curves for various green liquor conditions. The results help explain how calcite scale forms in green liquor handling systems.

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