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

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.

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Selective addition of C-PVAm to improve dry strength of TMP mixed tissue paper

Nordic Pulp & Paper Research Journal ◽

10.1515/npprj-2020-0074 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Jin Ho Seo ◽

Kwang Seob Lee ◽

Tae Joo Lee ◽

Jeong Yong Ryu

Keyword(s):

Kraft Pulp ◽

Reaction Rate ◽

Thermomechanical Pulp ◽

Centrifugal Forces ◽

Physical Strength ◽

Tissue Paper ◽

Tensile Index ◽

Bleached Kraft Pulp ◽

Selective Addition ◽

High Reaction Rate

AbstractDuring the manufacture of low basis weight tissue paper, it is difficult to efficiently use the dry strength agent (DSA) because a large amount of DSA adsorbed fines releases in forming roll by centrifugal forces. In this study, cationic polyvinylamine (C-PVAm) was used as a DSA in an environment where the retention of fines was weak. Addition of C-PVAm to the thermomechanical pulp (TMP) or TMP mixed with softwood bleached kraft pulp (SwBKP) improved the turbidity of filtrate from sheet former, however, the strength of handsheet paper was similar to that without C-PVAm. When C-PVAm was selectively added to SwBKP as much as 4 %, the tensile index could be improved by approximately 10.6 % without changing the retention of fines. In addition, C-PVAm added before the beating of SwBKP showed better results than C-PVAm added after the beating in terms of fines retention, tensile index, and formation. In particular, the tensile index was improved about 7.7 % by adding of C-PVAm 4 % as is before beating of SwBKP. Consequently, it was found that C-PVAm with a high reaction rate can be added before beating of SwBKP to improve the physical strength.

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

Nordic Pulp & Paper Research Journal ◽

10.1515/npprj-2018-3009 ◽

2018 ◽

Vol 33 (1) ◽

pp. 142-149 ◽

Cited By ~ 1

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.

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Research on Production of Hand Towel from the Poplar Extruding Mechanical Pulp (EMP)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.3253 ◽

2012 ◽

Vol 550-553 ◽

pp. 3253-3257

Author(s):

Xian Qi Sun ◽

Chuan Shan Zhao ◽

Hui Rong Yang

Keyword(s):

Kraft Pulp ◽

Lower Cost ◽

Raw Materials ◽

Raw Material ◽

Public Places ◽

Mechanical Pulp ◽

Tissue Paper ◽

Chemical Pulp ◽

Bleached Kraft Pulp ◽

High Level

Hand towel is one kind of disposable tissue paper which has characteristic of soaking up water quickly and lower cost. It becomes increasingly popularity in families, at work, and public places. There are many kinds of raw materials to produce hand towel according to its level. Some researches showed that bleached chemical pulp could be partially used to the production of hand towel and some other household paper. In this study, some kinds of raw material which be used to produce hand towel were analyzed and trying to looking for new one. Poplar Extruding Mechanical Pulp (EMP) had characteristics of long fiber, high level of strength and brightness. Different ratio of poplar EMP and certain Bleached Kraft Pulp were tested to make hand towel. The effects of poplar EMP on whiteness, tensile strength, bulkiness, absorbability were discussed. The results showed that characteristic targets of hand towel made from poplar EMP and Bleached Kraft Pulp met the quality requirements of GBT22455-2009 and satisfied the high-end hand towel. The new hand towel had lower cost, higher stiffness and higher bulkiness. It was feasible from the technique and economy point.

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Application of xylanases from Amazon Forest fungal species in bleaching of eucalyptus kraft pulps

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132007000200008 ◽

2007 ◽

Vol 50 (2) ◽

pp. 231-238 ◽

Cited By ~ 13

Author(s):

Roseli Garcia Medeiros ◽

Francides Gomes da Silva Jr. ◽

Sônia Nair Báo ◽

Rogério Hanada ◽

Edivaldo Ximenes Ferreira Filho

Keyword(s):

Kraft Pulp ◽

Morphological Changes ◽

Dry Weight ◽

Fungal Species ◽

Amazon Forest ◽

Kraft Pulps ◽

Small Reduction ◽

Bleached Pulp ◽

Enzyme Pretreatment ◽

Eucalyptus Kraft Pulp

Crude xylanase preparations from Penicillium corylophilum, Aspergillus niger and Trichoderma longibrachiatum were used to treat Eucalyptus kraft pulp, prior to chlorine dioxide and alkaline bleaching sequences. The enzyme pretreatment improved brightness and delignification of non-delignified and oxygen-bleached samples of eucalyptus kraft pulp. Xylanase preparations from T. longibrachiatum and P. corylophilum were more effective to reduce pulp kappa number. A small reduction in viscosity was obtained when the oxygen-bleached pulp was treated with xylanase preparation from A. niger. For all enzyme samples, the best release of chromophoric material from the pulp was at 237 nm. The enzyme preparation from P. corylophilum was responsible for the highest release of reducing sugar at a dosage interval of 10-20 IU/g dry weight pulp. Scanning electron microscopy studies of oxygen-bleached pulp after xylanase treatment revealed morphological changes, including holes, cracks, filament forming and peeling.

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Multivariate Analysis of Hemicelluloses in Bleached Kraft Pulp Using Infrared Spectroscopy

Applied Spectroscopy ◽

10.1177/0003702816675363 ◽

2016 ◽

Vol 70 (12) ◽

pp. 1981-1993 ◽

Cited By ~ 3

Author(s):

Zhiwen Chen ◽

Thomas Q. Hu ◽

Ho Fan Jang ◽

Edward Grant

Keyword(s):

Multivariate Analysis ◽

Infrared Spectroscopy ◽

Sample Preparation ◽

Kraft Pulp ◽

Control Variable ◽

Discrete Wavelet ◽

Kraft Pulps ◽

Bleached Kraft Pulp ◽

Ft Ir ◽

Mean Square Errors

The hemicellulose composition of a pulp significantly affects its chemical and physical properties and thus represents an important process control variable. However, complicated steps of sample preparation make standard methods for the carbohydrate analysis of pulp samples, such as high performance liquid chromatography (HPLC), expensive and time-consuming. In contrast, pulp analysis by attenuated total internal reflection Fourier transform infrared spectroscopy (ATR FT-IR) requires little sample preparation. Here we show that ATR FT-IR with discrete wavelet transform (DWT) and standard normal variate (SNV) spectral preprocessing offers a convenient means for the qualitative and quantitative analysis of hemicelluloses in bleached kraft pulp and alkaline treated kraft pulp. The pulp samples investigated include bleached softwood kraft pulps, bleached hardwood kraft pulps, and their mixtures, as obtained from Canadian industry mills or blended in a lab, and bleached kraft pulp samples treated with 0–6% NaOH solutions. In the principal component analysis (PCA) of these spectra, we find the potential both to differentiate all pulps on the basis of hemicellulose compositions and to distinguish bleached hardwood pulps by species. Partial least squares (PLS) multivariate analysis gives a 0.442 wt% root mean square errors of prediction (RMSEP) for the prediction of xylan content and 0.233 wt% RMSEP for the prediction of mannan content. These data all support the idea that ATR FT-IR has a great potential to rapidly and accurately predict the content of xylan and mannan for bleached kraft pulps (softwood, hardwood, and their mixtures) in industry. However, the prediction of xylan and mannan concentrations presented a difficulty for pulp samples with modified cellulose crystalline structure.

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

Revista Árvore ◽

10.1590/s0100-67622005000300017 ◽

2005 ◽

Vol 29 (3) ◽

pp. 489-494 ◽

Cited By ~ 2

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

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MODIFIKASI PERMUKAAN SERAT LBKP DAN HASIL DEINKING DENGAN KARBOKSIMETIL SELULOSA

JURNAL SELULOSA ◽

10.25269/jsel.v2i02.35 ◽

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

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PATI TERMODIFIKASI ENZIMATIS SEBAGAI KOMPONEN PEREKAT BAHAN SALUT KERTAS CETAK

JURNAL SELULOSA ◽

10.25269/jsel.v2i01.29 ◽

2016 ◽

Vol 2 (01) ◽

Cited By ~ 1

Author(s):

Nina Elyani ◽

Jenni Rismijana ◽

Teddy Kardiansyah ◽

Cucu ,

Keyword(s):

Kraft Pulp ◽

Paper Industry ◽

Dry Weight ◽

Modified Starch ◽

Cationic Starch ◽

Water Penetration ◽

Paper Properties ◽

Bleached Kraft Pulp ◽

Base Paper ◽

Printing Paper

This research has been conducted through several steps. Step I was base papermaking using 80% LBKP and 20 % NBKP. They were refine separately up to 300 ml CSF, then mixed with 15% CaCO3, 0.6% AKD, 0.5% poliacrylamide, and 1,5% cationic starch to dry-weight of fibers. Step II was modifying starch enzymaticaly at 70-75°C, pH 6.5 - 7.0, amylase 0,05% for 15 minutes. Step III was base-paper coating with varied adhesives. Variation I use natural starch, Variation II use enzymatic modified starch, Variation III use commercial starch each of 8%. Testing for the handsheets comprise of brightness, roughtness, picking strength, water penetration, and pH. The results showed that the viscosity for natural starch, enzymatic starch and commercial starch respectively at 8000 cPs, 26 cPs and 114 cPs. The use of enzymatic modified starch give the best paper properties. The experiments has replicated in a laboratory of paper industry, with the same results, using clay and CaCO3 at 40:60 ratio, enzymatic starch, commercial starch, and natural starch.Keywords: starch, coated printing paper, amylase, viscosity. ABSTRAK Penelitian ini dilakukan melalui beberapa tahapan. Tahap I adalah pembuatan kertas dasar dengan menggunakan bahan baku 80% serat pendek atau leaf bleached kraft pulp (LBKP) dan 20% serat panjang atau needle bleached kraft pulp ( NBKP) digiling secara terpisah hingga mencapai derajat giling 300 ml CSF. Selanjutnya pulp dicampur ke dalam bahan kimia yang terdiri 15 % CaCO3, 0,6% AKD, 1,5% pati kationik dan Poliakrilamida sebesar 0,5% terhadap berat kering pulp. Lembaran dibuat pada gramatur 60 g/m2. Tahap II adalah pembuatan pati termodifikasi enzimatis pada kondisi inkubasi suhu sekitar 70 – 75oC, pH : 6,5 – 7,0, waktu selama 15 menit dengan penambahan amilase sebesar 0,05%. Tahap III adalah proses penyalutan kertas dasar dengan pati termodifikasi enzimatis, sebagai pembanding menggunakan pati alam maupun pati komersial. Kemudian dilakukan pengujian terhadap lembaran yang dihasilkan meliputi : derajat putih, kekasaran, penetrasi minyak, ketahanan cabut, daya serap air dan pH. Selanjutnya dilakukan uji coba di industri dengan komposisi pigmen kaolin dan kalsium karbonat 40 : 60 menggunakan pati enzim, pati komersial, dan pati alam. Hasil percobaan menunjukkan bahwa viskositas untuk pati alam, pati enzim dan pati komersial masing-masing adalah sebasar 8000 cPs, 26 cPs dan 114 cPs. Penggunaan pati modifikasi enzim memberikan sifat kertas yang paling baik. Hasil replikasi percobaan di laboratorium industri, pati enzim juga menghasilkan sifat kertas yang lebih baik.Kata kunci: pati, kertas cetak salut, amilase, viskositas.

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Effect of ultraviolet irradiation on the thermal stability of bleached eucalyptus kraft pulp

TAPPI Journal ◽

10.32964/tj11.2.69 ◽

2012 ◽

Vol 11 (2) ◽

pp. 69-74

Author(s):

VAGNER ROBERTO BOTARO ◽

KÁTIA MONTEIRO NOVACK ◽

JORGE LUIZ COLODETTE ◽

LEONARDO SOUZA DE CAUX

Keyword(s):

Thermal Stability ◽

Ultraviolet Irradiation ◽

Kraft Pulp ◽

Cellulose Oxidation ◽

Cellulosic Fibers ◽

Bleached Kraft Pulp ◽

Elemental Chlorine ◽

Eucalyptus Kraft Pulp ◽

Pulp Sample ◽

Ultraviolet Treatment

The changes occurring on cellulosic fibers caused by ultraviolet irradiation at 360 nm for 24 h and 48 h were investigated. A never-dried industrial Eucalyptus urograndis elemental chlorine free–bleached kraft pulp sample (O/OD[EP]DP sequence) was used throughout the work. After irradiation, the cellulosic fibers were analyzed for polymerization degree changes, extractive and pentosan content, ultraviolet and visible spectrometric changes of water leachate from the fibers and thermal analysis (TGA/DTA). The ultraviolet treatment had no effect on the degree of cellulose polymerization. The water extracted from ultraviolet-treated fibers revealed cellulose oxidation, with increasing absorbance signals for carbonyl and carboxyl groups. Those oxidations influenced fiber thermal stability.

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