Research on Preparation and Properities of Chemi-Mechanical Pulp from the Waste Poplar Wood

2013 ◽  
Vol 848 ◽  
pp. 325-329
Author(s):  
Xia Li ◽  
Chuan Shan Zhao ◽  
Jin Jin Yu ◽  
Wen Jia Han
Keyword(s):  
Optimal Time ◽  
Optimal Dosage ◽  
Poplar Wood ◽  
Fiber Morphology ◽  
Strength Index ◽  
Mechanical Pulp ◽  
Tear Index ◽  
Length Width ◽  
Normal Atmospheric Pressure ◽  
Crush Strength

In this study, we prepared unbleached chemi-mechanical pulp from waste poplar wood using alkaline processing under normal atmospheric pressure. The influnce of alkaline dosage and time to fiber morphology and properties of the paper were discussed. The parameters of fiber including the length ,width and curl index were measured by FQA. The optimal dosage of NaOH and the optimal time of soaking period in the preparation of pulp using waste poplar wood were studied. The results showed that the optimal dosage of NaOH was 6% and the time of soaking period was one day. The performance of the handsheet made from the poplar wood under the pulping conditions are as follows: tensile strength index of 27 N·m/g, tear index of 0.51 mN·m2/g, burst index of 1.7 KPa·m2/g, folding strength of 16 times, ring crush strength index of 5.7 N.m/g, whiteness of 55.5 ISO, white opacity of 97%, paper absorption liquid rate of 0.32 mm/s.

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 Sequential Oxidation on Wood and Its Application in Pb2+ Removal from Contaminated Water

2021 ◽  
Vol 2 (2) ◽  
pp. 245-256
Author(s):  
Priyanka R. Sharma ◽  
Sunil K. Sharma ◽  
Marc Nolan ◽  
Wenqi Li ◽  
Lakshta Kundal ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Average Length ◽  
Sodium Chlorite ◽  
Contaminated Water ◽  
Maximum Adsorption Capacity ◽  
Fiber Morphology ◽  
Carboxylate Groups ◽  
Carboxylate Content ◽  
Wide Range ◽  
Length Width

Raw wood was subjected to sequential oxidation to produce 2,3,6-tricarboxycellulose (TCC) nanofibers with a high surficial charge of 1.14 mmol/g in the form of carboxylate groups. Three oxidation steps, including nitro-oxidation, periodate, and sodium chlorite oxidation, were successfully applied to generate TCC nanofibers from raw wood. The morphology of extracted TCC nanofibers measured using TEM and AFM indicated the average length, width, and thickness were in the range of 750 ± 110, 4.5 ± 1.8, and 1.23 nm, respectively. Due to high negative surficial charges on TCC, it was studied for its absorption capabilities against Pb2+ ions. The remediation results indicated that a low concentration of TCC nanofibers (0.02 wt%) was able to remove a wide range of Pb2+ ion impurities from 5–250 ppm with an efficiency between 709–99%, whereby the maximum adsorption capacity (Qm) was 1569 mg/g with R2 0.69531 calculated from Langmuir fitting. It was observed that the high adsorption capacity of TCC nanofibers was due to the collective effect of adsorption and precipitation confirmed by the FTIR and SEM/EDS analysis. The high carboxylate content and fiber morphology of TCC has enabled it as an excellent substrate to remove Pb2+ ions impurities.

scholarly journals Morphological, mechanical, and optical properties of cypress papers

Holzforschung ◽  
2014 ◽  
Vol 68 (8) ◽  
pp. 867-874 ◽  
Author(s):  
Ofélia Anjos ◽  
António J. A. Santos ◽  
Rogério Simões ◽  
Helena Pereira
Keyword(s):  
Light Scattering ◽  
Energy Demand ◽  
Mechanical Performance ◽  
Fibre Length ◽  
Kraft Pulping ◽  
Cupressus Lusitanica ◽  
Tear Index ◽  
Length Width ◽  
Pulp Properties ◽  
Pine Species

Abstract The pulping properties of cypress species are not known and the present paper aims to filling this gap. Namely, Cupressus lusitanica Mill., C. sempervirens L. and C. arizonica Greene have been submitted to kraft pulping and the pulp properties are compared with those of Pinus pinaster Aiton. and P. sylvestris Watereri as references. Schopper Riegler degree, density, Bekk’s smoothness, tensile index, tear index, burst index, stretch, dry zero-span strength, wet zero-span strength, brightness, opacity and light scattering coefficient have been tested. The pulp yields and delignification degrees of cypress woods were lower than those of the pine references. Fibre length, width and coarseness were statistically different between pines and cypress species and C. sempervirens pulps have corresponding data close to those of pine species. Cypress pulps can be refined much faster than pine pulps. The papers sheets of cypress fibres have, in general, lower mechanical performance than those of pine fibres. Papers from C. arizonica and C. lusitanica are similar and C. sempervirens has intermediate properties being between the other cypress and pine species. However, cypress fibres are relatively short, flexible and collapsible and can be refined with low energy demand, and thus could be incorporated into papers resulting in products with better light scattering and smoothness.

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 

Timber bamboo pulp

TAPPI Journal ◽  
2013 ◽  
Vol 12 (2) ◽  
pp. 9-15 ◽  
Author(s):  
TROY RUNGE ◽  
CARL HOUTMAN ◽  
ALBERTO NEGRI ◽  
JACKIE HEINRICHER
Keyword(s):  
Paper Industry ◽  
Hybrid Poplar ◽  
Weighted Average ◽  
Pulp And Paper Industry ◽  
Poplar Wood ◽  
Fiber Morphology ◽  
Fast Growing ◽  
Bamboo Pulp ◽  
Kraft Cooking ◽  
Poplar Tree

Fast-growing biomass, such as bamboo, has the potential to serve an important future role in the pulp and paper industry with potential to both lower resource costs and improve a product’s sustainability. Moso bamboo is particularly interesting due to its fast growth and size, which allows it to be handled and chipped similarly to wood resources. In this study, we will share results of the chip preparation, kraft cooking, and ECF bleaching of this bamboo species and compare its pulpability, bleachability, and physical properties to a fast growing hybrid poplar tree. Results indicate that the bamboo chips cooked and bleached similarly to the poplar hardwood, allowing for co-cooking. The resulting pulps had superior tensile properties at low refining, but did have higher fines that lowered drainability as measured by Canadian Standard Freeness. The bamboo fiber morphology was also measured, indicating the fiber to have length weighted average fiber lengths and coarseness values to be greater than the poplar wood studied, which should allow this material to be used in many paper grades.

Enhancement of processability, surface, and mechanical properties of paper based on rice straw pulp using biopolymers for packaging applications

TAPPI Journal ◽  
2019 ◽  
Vol 18 (7) ◽  
pp. 431-440
Author(s):  
SHUBHANG BHARDWAJ ◽  
NISHI KANT BHARDWAJ ◽  
YUVRAJ SINGH NEGI
Keyword(s):  
Rice Straw ◽  
Suspended Solids ◽  
Strength Properties ◽  
Absorption Index ◽  
Paper Machine ◽  
Oxidized Starch ◽  
Surface Sizing ◽  
Tear Index ◽  
Breaking Length ◽  
Crush Strength

Two biopolymers, chitosan and oxidized starch, were used as wet-end additives to improve the strength properties of the paper because of their biodegradable and non-hazardous qualities. The present study reports the improvement in surface and strength properties of packaging-grade paper made with rice straw pulp using biopolymers, chitosan, oxidized starch, and surface sizing added at the wet end of the paper machine. Use of chitosan at all doses from 0.5 to 10 kg/ton enhanced important surface and strength properties of paper. The breaking length, tear index, burst index, ring crush strength, stretch, tensile energy absorption index, and Taber stiffness of the paper with 10 kg/ton of chitosan as a wet-end additive showed 22%, 14%, 20%, 59%, 16%, 44%, and 48% improvement, respectively, in comparison to control, (i.e, without its addition). The Cobb60 was also reduced by 45%, showing better resistance to water in comparison to rice straw paper alone. The effects of chitosan added at the wet end on the paper surface were investigated using Fourier transform infrared spectroscopy (FTIR). The use of 10 kg/ton of chitosan at the wet end reduced the color and total suspended solids in the back water of the papermaking system by 55% and 51%, respectively. Further enhancement in the surface and strength properties of paper was observed following surface sizing with oxidized starch.

Application of improved chemical–mechanical pulp from poplar wood in the packing paper composition

2007 ◽  
Vol 66 (1) ◽  
pp. 75-76 ◽  
Author(s):  
Nelly Georgieva ◽  
R. Boeva-Spiridonova ◽  
I. Spiridonov ◽  
E. Petkova ◽  
L. Yotova
Keyword(s):  
Poplar Wood ◽  
Mechanical Pulp

Tear and tensile strength development of PGW and CTMP pulps mixed with PLA or viscose fibres

2014 ◽  
Vol 29 (2) ◽  
pp. 304-308 ◽  
Author(s):  
Jaakko Asikainen ◽  
Antti Korpela
Keyword(s):  
Tensile Strength ◽  
Fibre Length ◽  
Wood Fibre ◽  
Strength Development ◽  
Paper Properties ◽  
Mechanical Pulp ◽  
Tear Strength ◽  
Tear Index ◽  
Simultaneous Decrease ◽  
A Minor

Abstract The objective was to evaluate the effects on paper properties when replacing a minor share of wood fibre by synthetic fibre. The aim was to increase tear strength and stretch while minimizing the loss of tensile strength in paper consisting of mechanical pulp. Tested synthetic fibres included PLA and viscose fibres mixed with mechanical or chemi-mechanical pulp. Even at relatively low proportions, the synthetic fibres contributed to a significant increase of tear strength in the wood fibre based papers. With the highest tested proportion (20%) the increase of tear index in PGW based stock was 243% with PLA and 177% with viscose fibre. However, a simultaneous decrease in tensile strength and tensile stiffness was observed. The stretch at break remained unchanged. Thickness reduction of the synthetic fibres resulted in an increase of tear strength. The effect is due to the high fibre length of synthetic fibres, producing mechanically well entangled networks, coupled with the high enough strength of the synthetic fibres.

scholarly journals Low-formaldehyde emission composite particleboard manufactured from waste chestnut bur

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Jiayin Liang ◽  
Jiabiao Wu ◽  
Jianying Xu
Keyword(s):  
Mechanical Properties ◽  
Base Material ◽  
Formaldehyde Emission ◽  
Raw Material ◽  
Composite Panel ◽  
Total Phenol Content ◽  
Phenolic Substance ◽  
Poplar Wood ◽  
Fiber Morphology ◽  
Composite Board

AbstractChestnut bur is an agro-waste material generated in the chestnut production. It is a tannin-rich lignocellulosic material which might be a promising raw material for low-formaldehyde composite particleboard production when using urea–formaldehyde (UF) as bonding adhesive. In this study, the characteristics of chestnut bur were analyzed to assess its application value for composite panel. Five-type particleboards were manufactured from the mixture of chestnut bur/poplar particles with the weight ratios of 0/100, 25/75, 50/50, 75/25 and 100/0, UF resin was used as bonding adhesive. The effects of the addition amount of chestnut bur on the physical, mechanical properties and formaldehyde emission of particleboard were studied. The results showed as follows: (1) chestnut bur showed low cellulose, hemicelluloses and lignin contents, but high extractives and ash contents compared with poplar wood. Chestnut bur and poplar wood had the similar fiber morphology. (2) Composite board with relatively good performances could be manufactured with mix particles of chestnut bur and poplar wood. With the increasing of chestnut bur content, the mechanical properties of the composite board decreased, whereas the dimensional stability increased. (3) The total phenol content in the chestnut bur was as high as 13.79%. The phenolic substance in the chestnut burs could react with free formaldehyde. Hence, the free formaldehyde emission of particleboard was effectively reduced. In summary, waste chestnut bur is a suitable material which can not only be utilized as the base material, but also a natural free formaldehyde scavenger for composite particleboard production.

scholarly journals Thermomechanical pulping of novel Brazilian Eucalyptus hybrids

Holzforschung ◽  
2013 ◽  
Vol 67 (5) ◽  
pp. 489-495 ◽  
Author(s):  
Marcelo Coelho dos Santos Muguet ◽  
Kyösti Ruuttunen ◽  
Anna-Stiina Jääskeläinen ◽  
Jorge Luiz Colodette ◽  
Tapani Vuorinen
Keyword(s):  
Energy Consumption ◽  
Energy Demand ◽  
Fiber Development ◽  
Fiber Morphology ◽  
Mechanical Pulp ◽  
Minor Influence ◽  
Thermomechanical Pulping ◽  
Technical Properties ◽  
Guaiacyl Lignin ◽  
A Minor

Abstract The importance of Eucalyptus wood as a sustainable resource is well established. Mechanical pulp production is an energy-intensive process, and methods for decreasing energy demand are needed. In the present article, the structure of Eucalyptus hybrids and the produced pulps from the hybrids were assessed in terms of energy consumption, technical properties, and fiber morphology. The defibration and fiber development were investigated by traditional thermomechanical pulping in laboratory scale. There was no clear difference in the extent of defibration and fibrillation among the hybrids, with the exception of one hybrid (U2xGL1). Guaiacyl lignin contents of more than 7.2% had a minor influence on energy consumption, and this finding is different from the results of previous studies on chemimechanical pulping processes. However, a low amount of guaiacyl lignin (6.1% based on wood) decreased the energy demand. This assessment is of major importance concerning the energy-saving defibration during thermomechanical pulping production.

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