Journal articles: 'Handsheet'

1

WANG, XIAOHAN, YANQUN SU, JINGANG LIU, ZHIBIN HE, and YONGHAO NI. "Development of a fast brightness testing method for mechanical pulp based on microwave oven drying." June 2020 19, no. 6 (July 1, 2020): 293–99. http://dx.doi.org/10.32964/tj19.6.293.

Full text

Abstract:

Brightness is an important quality parameter for pulp products, and it is important to have reliable measurement of pulp brightness in a timely manner for process control and/or quality control purposes. In these circumstances, a quick testing method for pulp brightness is highly desirable. A rapid handsheet brightness testing method for lignin-rich mechanical pulp has been developed, which is based on the use of tap water to make handsheets and microwave ovens to rapidly dry the handsheet. Microwave oven fast drying decreased the handsheet brightness of mechanical pulp by 5–6 points due to the lignin-originated discoloration reactions. The spray of ascorbic acid and ethylenediaminetetraacetic acid (EDTA) solutions to the handsheet can effectively inhibit these lignin discoloration reactions. With 0.2% ascorbic acid and 0.2% EDTA spraying on the wet pulp handsheet, the brightness of the handsheet from a peroxide-bleached stone groundwood pulp after the microwave oven fast drying method was similar to that obtained from the same pulp but following TAPPI Standard Test Method T 272 sp-12 “Forming handsheets for reflectance testing of pulp (sheet machine procedure)”. The effect of handsheet dryness on the handsheet brightness was also studied, and the results showed that the brightness reading was almost constant in the dry-ness range of 70% to 90%. The method developed is a reliable, fast brightness testing method for lignin-rich pulp that is of practical interest in industrial operations.

APA, Harvard, Vancouver, ISO, and other styles

2

Saidan, Motasem. "Improvement of linerboard compressive strength by hot-pressing and addition of recovered lignin from spent pulping liquor." Chemical Industry and Chemical Engineering Quarterly 21, no. 1-1 (2015): 107–12. http://dx.doi.org/10.2298/ciceq131205012s.

Full text

Abstract:

This paper evaluates the effect of addition of precipitated lignin, from spent pulping black liquor, to a wet single-ply linerboard handsheet followed by hot-pressing at different temperatures, on the improvement of its compressive strength. Linerboard handsheets for testing the effect of lignin addition were prepared so that the lignin-modified sheets would have the same basis weights as the control handsheets. Both the commercial and the black liquor lignin were added as a powder to wet handsheets after couching from the handsheet mold. The experiments and testing of the physical and strength properties of dried handsheets were conducted according to TAPPI test methods. The results revealed that the addition of the recovered lignin (at pH of 2) to the wet handsheet followed by hot-pressing at 150?C increased the compressive strength of linerboard handsheets by 10% to 20% above that for handsheets made without the addition of lignin. The same results were achieved using purchased lignin. However, with a 16% addition to linerboard, purchased lignin would be too expensive. These results indicate that inclusion of kraft lignin in linerboard sheets could be proved as an attractive option to reduce linerboard basis weight.

APA, Harvard, Vancouver, ISO, and other styles

3

VANEREK, ALOIS, JIMMY JONG, YOUNG-IL JEONG, FRANÇOISE FOREL, and JOSÉ-ANTONIO ORCCOTOMA. "Two-sided drainage handsheet machine." TAPPI Journal 11, no. 5 (June 1, 2012): 9–16. http://dx.doi.org/10.32964/tj11.5.9.

Full text

Abstract:

A new Two-Sided Drainage Handsheet Machine (TSDHM) was developed and compared to the Standard British Handsheet Machine (Standard Machine). The results show that fines and filler distribution in handsheets produced in the one-sided drainage mode by the TSDHM closely mimics the fines and filler distribution of the Standard Machine. When the drainage was reversed on the TSDHM from the classical 100% bottom to 100% top, the fines and filler profiles in the handsheets could be reverted. The two-sided drainage mode on the TSDHM can produce fines and filler profiles across the paper thickness that are completely different from the one-sided drainage mode. These profiles are more representative of top and twin-wire formers.

APA, Harvard, Vancouver, ISO, and other styles

4

Wimmer, R., G. M. Downes, R. Evans, G. Rasmussen, and J. French. "Direct Effects of Wood Characteristics on Pulp and Handsheet Properties of Eucalyptus globulus." Holzforschung 56, no. 3 (April 29, 2002): 244–52. http://dx.doi.org/10.1515/hf.2002.040.

Full text

Abstract:

Summary Fibre length, microfibril angle and wood density were measured in eight-year-old Eucalyptus globulus clones planted on three different sites. Samples were chipped and pulped, and the pulps beaten prior to preparation of 60g/m2 handsheets. Eleven physical handsheet properties, together with pulp freeness, were measured using standard methods. Direct relationships between wood properties and pulp/paper properties were studied using path analysis. Fibre length had a strong, direct effect on tear index, bending stiffness, freeness, pulp yield and active alkali consumption. Wood density was a strong predictor of most handsheet properties: high density woods produced bulkier, more porous sheets with higher bending stiffness, while lower density woods produced smoother, denser sheets with higher tensile strength.The effect of microfibril angle was small and more evident in handsheets made from beaten pulp.

APA, Harvard, Vancouver, ISO, and other styles

5

Korpela, Antti, Aayush Kumar Jaiswal, and Jaakko Asikainen. "Effects of hydrophobic sizing on paper dry and wet-strength properties: A comparative study between AKD sizing of NBSK handsheets and rosin sizing of CTMP handsheets." BioResources 16, no. 3 (June 8, 2021): 5350–60. http://dx.doi.org/10.15376/biores.16.3.5350-5360.

Full text

Abstract:

Alkyl ketene dimer (AKD) and rosin sizing are used in papermaking to decrease paper’s tendency to absorb liquid water. Earlier information regarding the effects of internal sizing on paper dry strength is not consistent. In the present laboratory study, AKD sizing of handsheets made from Nordic bleached softwood pulp (NBSK), and rosin sizing of handsheets made from Nordic hardwood chemi-thermomechanical pulp (CTMP) were done via an internal sizing method, and by immersing handsheets in aqueous sizing agent dispersion. In the study, AKD sizing had no significant effect on the dry strength of NBSK handsheets. The result corresponds to practical experiences of papermakers. However, both AKD sizing methods resulted in a substantial and long-lasting increase of handsheet wet-strength. Unlike internal AKD sizing of NBSK handsheets, rosin internal sizing of CTMP handsheets resulted in decreased handsheet dry strength. The decrease indicates that, under the conditions present during the experiment, rosin sizing agents interfered with interfiber hydrogen bonding of CTMP fibers. Given that, in practice, no such undesired effects have been commonly linked to rosin sizing, the observed effect may be specific to sheet-making conditions. However, the effect of rosin sizing on strength properties and their variation cannot be ruled out completely.

APA, Harvard, Vancouver, ISO, and other styles

6

Yuan, Yuan, and Ruijin Liao. "A Novel Nanomodified Cellulose Insulation Paper for Power Transformer." Journal of Nanomaterials 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/510864.

Full text

Abstract:

A novel cellulose insulation paper handsheet has successfully been modified with various contents of montmorillonite (MMT). Relative permittivity and breakdown strength were investigated. The microstructure of MMT in Kraft paper was observed with scanning electron microscopy (SEM) and X-ray diffraction. The relative permittivity of the immersed oil Kraft-MMT handsheets (K-MMT) initially decreased with the increasing amount of MMT. For MMT concentration of 9 wt%, K-9% MMT possessed the lowest relative permittivity of approximately 2.3 at 50 Hz. The breakdown voltage of the paper-oil-paper composite insulation system increased from 50.3 kV to 56.9 kV. The tensile strength of the paper handsheet was also measured.

APA, Harvard, Vancouver, ISO, and other styles

7

Buggakupta, Wantanee, Somporn Chaiarrekij, Kuntinee Suvarnakich, Auchuta Niravittanon, and Thawanrat Apisampinvong. "High Density Polyethylene Catalyst Waste as a Filler in Papermaking." Key Engineering Materials 659 (August 2015): 264–68. http://dx.doi.org/10.4028/www.scientific.net/kem.659.264.

Full text

Abstract:

The study observes the use of a waste derived from high density polyethylene (HDPE) catalyst production as fillers in papermaking. The replacement of the industrial waste to two common fillers; calcium carbonate and clay, are of interest. The waste is in the form of bright slurry containing very fine particulates with titanium dioxide, calcium oxide and alumina, along with a small amount of chlorides. As-received HDPE waste of 0-30 wt% was added into a mixture of pulp stock to make handsheets. Cationic polyacrylamide was employed as a retention aid. The obtained handsheet samples were then dried and their properties were characterized and also compared with the handsheets holding carbonate and clay. Such properties included both physical and mechanical ones, i.e. apparent density, air resistance, brightness, opacity, smoothness, tear and tensile strength. The experimental results showed that the as-received industrial waste gave comparable outcomes to carbonate and kaolin clay. Improvement of the handsheet properties with the HDPE catalyst waste was discussed.

APA, Harvard, Vancouver, ISO, and other styles

8

J. OGLESBY, ROBERT, HUMPHREY J. MOYNIHAN, RICARDO B. SANTOS, ASHOK GHOSH, and PETER W. HART. "Does kraft hardwood and softwood pulp viscosity correlate to paper properties?" October 2016 15, no. 10 (November 1, 2016): 643–51. http://dx.doi.org/10.32964/tj15.10.643.

Full text

Abstract:

The impact of commercially prepared, fully bleached pulp viscosity variation on handsheet physical properties was evaluated at different levels of pulp refining. Hardwood pulps from the same brownstock species mix, cooking parameters, and kappa numbers were processed through two different commercial bleach plants: one with a D0(EP)D1D2 sequence and the second with an OD0(EOP)D1 sequence. Additionally, a commercial softwood (predominately Scotts pine) brownstock pulp bleached by an OD0(EP)D1D2 sequence was employed in this study. Pulps with viscosities ranging from 14 to 21 mPa∙s were refined in a Valley beater to two freeness levels, and the associated handsheet physical properties were measured in this study. Over the pulp viscosity range of 14 to 21 mPa∙s, no clear correlation was found to exist between pulp viscosity and related paper physical properties. Finally, a series of laboratory prepared bleached pulps were purposely prepared under non-ideal conditions to reduce their final viscosities to lower values. Handsheets made from these pulps were tested in their unbeaten condition for physical strength properties. Significant and rapid strength loss occurred when the measured pulp viscosity dropped below 12 mPa∙s; overall strength properties showed no correlation to viscosity above the critical 12 mPa∙s value.

APA, Harvard, Vancouver, ISO, and other styles

9

Perng, Yuan-Shing, Eugene I.-Chen Wang, Chih-Kai Chang, and Chih-Ping Chang. "Nanosericite as an Innovative Microparticle in Dual-Chemical Paper Retention Systems." Advances in Materials Science and Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/536961.

Full text

Abstract:

Dual-chemical retention systems based on 2 cationic polyacrylamides, a colloidal silica, and a globular anionic polymer microparticles were investigated and an exfoliated nanoparticle indigenous mica mineral, sericite, was examined for its efficacy in substituting commercial microparticle preparations. The results indicated that nanosericite generated FPR between 76.9 and 80.9% for fines and chemicals. Its ash retention values, however, were higher and tended to increase with doses of polymer, nanosericite, or Sc to between 16 and 24%. As for paper physical properties, nanosericite was not amenable to substitute the c-PAMb/polymer with only handsheet stiffness superior to the combination. Nanosericite, however, showed good substitution capacity than the c-PAMa-colloidal silica combination. Regardless of the c-PAMa doses, all examined handsheet physical properties incorporating nanosericite were superior to colloidal silica. The optimal performance was observed with c-PAMa dose of 200 ppm. Optical properties of the handsheets indicated that with nanosericite substitution, brightness values were comparable to the polymer group, while its substitution capacity for colloidal silica decreased with increasing c-PAMb dose. Only at c-PAMa dose of 300 ppm, it appeared to have good substitution for colloidal silica. Substituting nanosericite for colloidal silica appeared to reduce the c-PAMa charge and increased the overall cost effectiveness.

APA, Harvard, Vancouver, ISO, and other styles

10

Shang, Wei, Haoran Han, and Hunan Liang. "New Diatomite Filler for Improvement of Paper Strength Properties." Revista de Chimie 71, no. 5 (May 29, 2020): 479–90. http://dx.doi.org/10.37358/rc.20.5.8160.

Full text

Abstract:

In this work, diatomite particles were modified to improve the bondability of diatomite particles with pulp fibers and filler retention via a complex of cationic starch-sodium hexametaphosphate coating method. The particle size, FTIR spectroscopy characteristic and morphology of the resulting modified diatomite were studied to confirm the successful modification. The SEM results illustrated that the surface of modified diatomite particles was covered by the complex coatings. The coating efficiency of the complex of cationic starch-sodium hexametaphosphate on diatomite surface was up to 98%. Compared with the handsheet filled unmodified diatomite, the handsheet filled with modified diatomite had higher strength properties and lower bulk. When cationic starch dosage was 7%, and filler dosage was 25% , the resulting tensile strength of filled modified diatomite handsheet was 22.1% higher than the handsheet filled unmodified diatomite. Furthermore, with the filler loading of 30%, compared with that of unmodified diatomite, filler retention of modified diatomite was increased by 20.4%. The larger particle size and higher zeta potential of modified diatomite were benefitial to increase retention of modified diatomite filler.

APA, Harvard, Vancouver, ISO, and other styles

11

Halász, Katalin, Zsófia Kóczán, Annamária Tóth, Zoltán Pásztory, and Edina Preklet. "The effect of Plantago psyllium seed husk flour on the properties of cellulose sheet." Nordic Pulp & Paper Research Journal 35, no. 4 (November 18, 2020): 621–30. http://dx.doi.org/10.1515/npprj-2020-0037.

Full text

Abstract:

AbstractThis study examined the use of Plantago psyllium seed husk flour as paper additive with the aim of improving the properties of cellulose sheet. The husk flour was added in 5 wt%, 10 wt%, 20 wt% and 30 wt% to the cellulose suspensions and its effect on the handsheet properties was studied. The results showed that the direct addition of husk flour highly improves the mechanical properties of the handsheets like tensile index (with up to 400 %), burst index (with up to 600 %) and tear index (with up to 1200 %). Cobb and contact angle tests with distilled water showed that the handsheets containing husk flour are more hydrophobic compared to the unmodified handsheets. The Cobb-Unger and contact angle tests with oil revealed that the additive reduces the oil absorbency of the handsheets as well, at the highest by 86 %. Additionally, the water vapor and especially the air barrier properties were improved. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) antioxidant capacity test showed that the modified handsheets had free radical scavenging properties. The direct addition of Plantago psyllium seed husk flour can be a promising, easy and green method to improve the mechanical and barrier properties, oil and water resistance of cellulose sheets.

APA, Harvard, Vancouver, ISO, and other styles

12

Zhu, J. Y., and Gary C. Myers. "Kraft pulp from budworm-infested Jack pine." Holzforschung 60, no. 4 (July 1, 2006): 383–88. http://dx.doi.org/10.1515/hf.2006.060.

Full text

Abstract:

Abstract This study evaluated the quality of kraft pulp from budworm-infested jack pine. The logs were classified as merchantable live, suspect, or merchantable dead. Raw materials were evaluated through visual inspection, analysis of the chemical composition, SilviScan measurement of the density, and measurement of the tracheid length. Unbleached pulps were then refined using a laboratory disk refiner. The mechanical and optical properties of handsheets made from the refined pulps were evaluated. Although budworm galleries may affect the physical integrity of the wood, they have no effect on pulp quality. Blue stain did not affect the handsheet brightness. The results indicate that merchantable dead jack pine trees are acceptable for kraft pulp production, with equivalent pulp yield.

APA, Harvard, Vancouver, ISO, and other styles

13

Lan, Jia Liang, Le Fan Ma, Zheng Guo Li, Fu Ji Wang, and Bian Chu Liu. "The Study on Refining of Masson’s Pine Kraft Pulps for Sack Paper." Advanced Materials Research 236-238 (May 2011): 1297–300. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1297.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

14

Kenealy, William, Eric Horn, and Carl Houtman. "Vapor-phase diethyl oxalate pretreatment of wood chips: Part 1. Energy savings and improved pulps." Holzforschung 61, no. 3 (May 1, 2007): 223–29. http://dx.doi.org/10.1515/hf.2007.040.

Full text

Abstract:

Abstract Diethyl oxalate (DEO) was injected into a digester containing wood chips (pine, spruce, or aspen) preheated to 130–140°C and held for 30 min at the same temperature. When mechanical pulps were produced from these pretreated chips, savings in electrical refiner energy could be achieved. For southern yellow pine (Pinus taeda), the electrical refiner energy required to produce pulps with Canadian standard freeness (CSF) of 100 ml was 38– 55% less than for an untreated control. Energy savings were also observed for aspen (Populus spp.) and spruce (Picea spp.). DEO-treated pine handsheets showed a 26% improvement in tear index compared with a control at 100 ml CSF. Under the pretreatment conditions de-scribed, DEO rapidly vaporizes, reacts with water already present in the chip, and forms an oxalic acid (OA) solution. Reported handsheet properties and energy savings for pine chips treated with a solution of OA are similar to DEO-treated handsheets. It can be concluded that the effect of DEO treatment is due to reactions catalyzed by OA.

APA, Harvard, Vancouver, ISO, and other styles

15

Choi, Kyoung-Hwa, Ah Ram Kim, and Byoung-Uk Cho. "Manufacture of high bulk paper using alkali swollen kraft pulp." Nordic Pulp & Paper Research Journal 33, no. 3 (September 25, 2018): 503–11. http://dx.doi.org/10.1515/npprj-2018-3059.

Full text

Abstract:

Abstract Effects of alkali swelling of kraft pulp fibers and the order of alkali swelling and beating treatments on paper bulk and paper strength were evaluated in terms of NaOH concentration in order to produce high bulk sheet (i. e., high porous and low density sheet). Effects of replacement of part of furnish with the alkali swollen pulp on paper properties were also investigated. It was found that alkali swelling of pulp fiber can increase the bulk of handsheet. NaOH concentration and beating treatment influenced paper bulk and paper strength. Alkali swollen pulp without beating showed the highest handsheet bulk. The paper bulk of alkali swollen pulp with pre-beating was higher than that with post-beating. Paper strength decreased with increasing the bulk of handsheet. In addition, replacement of part of furnish with alkali swollen pulps increased paper bulk, adversely decreasing paper strength. The highest improvement in paper bulk was achieved with the addition of alkali swollen SwBKP without beating.

APA, Harvard, Vancouver, ISO, and other styles

16

Hoornstra, Douwe, Olof Dahlman, Elina Jääskeläinen, Maria A. Andersson, Assi Weber, Birgit Aurela, Henry Lindell, and Mirja S. Salkinoja-Salonen. "Retention of Bacillus cereus and its toxin, cereulide, in cellulosic fibres." Holzforschung 60, no. 6 (November 1, 2006): 648–52. http://dx.doi.org/10.1515/hf.2006.109.

Full text

Abstract:

AbstractBacillus cereusis the only pathogen that is occasionally found in paper and paper products, but there is no information on its prevalence. The aim of this work was to obtain data for a risk assessment ofB. cereusin cellulosic fibre-based products. Handsheets were formed using laboratory papermaking equipment from stocks admixed withB. cereus.Then the distribution ofB. cereusand its heat-stable toxin, cereulide, between the fibre web and the wire filtrate was measured. The handsheets retained 5% of the vegetative cells and spores ofB. cereusand 10–15% of the cereulide. Transfer of cereulide into food or drink through contact with paper was investigated using ethanol and hot and cold water as food and drink simulants. Less than 0.2% of the cereulide from handsheets was recovered from hot and cold water, as measured by LC/MS and the boar sperm bioassay. Total immersion in 95% v/v ethanol leached nearly all cereulide present in the paper. The results obtained with the bioassay were equivalent to those obtained by LC/MS for the leachates, indicating that cereulide retained its toxicity through the handsheet-making process. The results indicate that cereulide in pulps is probably also present in paper products made from them, but the concentration appears to be too low to be relevant in terms of toxicity.

APA, Harvard, Vancouver, ISO, and other styles

17

Okomori, Koji, Akira Isogai, Jun Yoshizawa, and Fumihiko Onabe. "Basic properties of handsheet containing starch pulp." Nordic Pulp & Paper Research Journal 9, no. 4 (December 1, 1994): 237–41. http://dx.doi.org/10.3183/npprj-1994-09-04-p237-241.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Hermawan, D., Che Mohamad Hazwan, FAT Owolabi, Deepu A. Gopakumar, M. Hasan, Samsul Rizal, NA Sri Aprilla, AR Mohamed, and HPS Abdul Khalil. "Oil palm microfiber-reinforced handsheet-molded thermoplastic green composites for sustainable packaging applications." Progress in Rubber, Plastics and Recycling Technology 35, no. 4 (July 8, 2019): 173–87. http://dx.doi.org/10.1177/1477760619861984.

Full text

Abstract:

The forestry and agricultural market have been perceiving outstanding growth due to the advantages of green composites, such as cost effective in nature, environment friendly, excellent mechanical properties, and so on. Various researchers had studied the reinforcement efficiency of various natural fibers in the diverse polymer matrices. Herein, we reported the characterization of microfiber handsheet-molded thermoplastic green composites developed from the combination of oil palm empty fruit bunch (OPEFB)-based microfiber pulp as filler and polyester PP based as matrix. Refined alkaline extracted OPEFB pulp fiber was mixed at different layered composition of the composite of grafted polypropylene. The physical properties and mechanical properties were conducted according to the ASTM standard and showed substantial improvement of the handsheet-molded composite. The scanning electron microgram showed that, as the addition of OPEFB fiber loading increased, there was improved interfacial bonding except for 50% fiber loading which experience fiber pullout. The result also showed improved thermal stability compared with the neat composite. This study will be an effective platform to develop the packaging materials using polymer handsheet composite. [Formula: see text]

APA, Harvard, Vancouver, ISO, and other styles

19

Cho, Yu-Je, Kang-Jae Kim, and Tae-Jin Eom. "Improvements of Strength and Retention of Cotton Handsheet by Additives(II) -The durability test of cotton handsheet with additives." Journal of Korea Technical Association of The Pulp and Paper Industry 46, no. 1 (February 28, 2014): 29–38. http://dx.doi.org/10.7584/ktappi.2014.46.1.029.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Nanko, Hiroki, Shun-ichiro Mukoyoshi, and Junji Ohsawa. "Multi-layered handsheet making with laboratory sheet machine." JAPAN TAPPI JOURNAL 41, no. 3 (1987): 249–54. http://dx.doi.org/10.2524/jtappij.41.249.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Lee, Sangyeob, Todd F. Shupe, Leslie H. Groom, and Chung Y. Hse. "Maleated polypropylene film and wood fiber handsheet laminates." Polymer Composites 30, no. 12 (December 2009): 1864–72. http://dx.doi.org/10.1002/pc.20761.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Ma, Yong Sheng, Yun Fa Chen, Xian Hui Sun, Chuan Jun Zhao, and Shou Jie Nie. "Application Study of Cationic Polymethyl Acrylate Emulsion as Papermaking Sizing Agent." Advanced Materials Research 479-481 (February 2012): 504–7. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.504.

Full text

Abstract:

The cationic polymethyl acrylate (CPMA) emulsion which was prepared with no soap emulsion polymerization was used with petroleum resin sizing agent in bleached wheat straw pulp and wood pulp as papermaking sizing agent. It was showed that by the experimental results that when the dosage of composite sizing agent composed of CPMA emulsion and anionic petroleum resin sizing agent was 0.2% absolute dry pulp, sizing degree and white degree of handsheet made of bleached wheat straw pulp were improved 33% and 5.2%ISO respectively. It was also showed that when the dosage of composite sizing agent was 0.2% absolute dry pulp, sizing degree and white degree of handsheet made of wood pulp were improved 37% and 4.2%ISO respectively.

APA, Harvard, Vancouver, ISO, and other styles

23

Chambers, Paul GS, and Nuno MG Borralho. "A simple model to examine the impact of changes in wood traits on the costs of thermomechanical pulping and high-brightness newsprint production with radiata pine." Canadian Journal of Forest Research 29, no. 10 (October 1, 1999): 1615–26. http://dx.doi.org/10.1139/x99-127.

Full text

Abstract:

A number of functions were investigated that related the costs of thermomechanical pulp (TMP) and high-brightness newsprint production, using Pinus radiata D. Don, to important pulp and paper quality (breeding objective) variables, including specific energy consumption and pulp handsheet tear and tensile strength, brightness, and opacity. Pulp handsheet quality traits were considered to be reasonable two-dimensional predictors of paper quality traits in this context. A specific production process that requires the use of a reinforcement kraft pulp and an artificial clay filler to improve the quality of paper produced from the bleached TMP fibres was investigated, similar to the production process used by Australian Newspaper Mills' Boyer Mill in Tasmania, Australia. Pulp and pulp handsheet quality variables could be explained by significant (P > 0.05) wood traits using multiple linear regression equations. This provided a method to predict the economic importance of each wood trait in relation to the thermomechanical production process investigated. The results showed that tracheid length, wood density, wood brightness, and tracheid coarseness were the best predictors of costs. Increases in tracheid length, wood density, and wood brightness and decreases in tracheid coarseness resulted in decreasing the total costs of TMP and high-brightness newsprint production.

APA, Harvard, Vancouver, ISO, and other styles

24

Shioa Wei, Tan, Boon Jia Geng, Low Hui Qi, Goh Kent Tiong, Kuek Sook Chi, and Wong We Hoong. "Effect of bleaching using sodium hydroxide on pulp derived from Sesbania grandiflora." Journal of Tropical Resources and Sustainable Science (JTRSS) 6, no. 1 (September 2, 2021): 1–3. http://dx.doi.org/10.47253/jtrss.v6i1.718.

Full text

Abstract:

World demand for paper is increasing. Short rotation pulpwood is needed. Sesbania grandiflora also known as Turi, is a fast growing and straight log species. The scholarly information of Turi as pulpwood are still limited. This paper aims to provide information of sodium hydroxide effect on the paper made from pulp derived from Turi. Sodium hydroxide is a common chemical using as part of full stage chemical bleaching in pulp industrial. Kraft pulp that produced using Turi, was bleached with sodium hydroxide at 3%, 6% and 9% based on pulp weight, respectively. Unbleached pulp was served as blank test. The optical and mechanical properties of handsheet paper made from bleached kraft pulp were evaluated according to TAPPI standard. The brightness and opacity of handsheet made from bleached pulp were improved with increasing the concentration of sodium hydroxide. The mechanical properties of handsheet were improved with using 3% sodium hydroxide and gradually decreased after 3% sodium hydroxide. In conclusion, sodium hydroxide is potential to improve optical properties of Turi pulp and improve the mechanical properties of paper made from Turi pulp at certain level. Excessive usage of sodium hydroxide brings adverse effect to mechanical properties of paper made from Turi pulp.

APA, Harvard, Vancouver, ISO, and other styles

25

Seyed-Yagoobi, J., K. H. Ng, and L. S. Fletcher. "Thermal Contact Conductance of a Bone-Dry Paper Handsheet/Metal Interface." Journal of Heat Transfer 114, no. 2 (May 1, 1992): 326–30. http://dx.doi.org/10.1115/1.2911279.

Full text

Abstract:

An apparatus was constructed for determination of the thermal contact conductance for a paper handsheet/metal interface and for measurement of the effective thermal conductivity of handsheet samples. Bone-dry Bleached Southern Mixed Kraft hand-sheets with a water retention value of 1.832 were used to study the effect of pressure on thermal contact conductance and to measure the effective thermal conductivity of samples at various sheet density levels. A regression model describing the interface thermal contact conductance as a function of pressure and basis weight was derived. The contact conductance increases with increasing pressure or with decreasing basis weight. At a pressure of 2.3 kPa, the value of the interface contact conductance for the bone-dry samples considered ranges from approximately 97 W/m2K for a sheet of 348.7 g/m2 basis weight to 200 W/m2K for a sheet of 68.0 g/m2 basis weight. For pressures near 300 kPa, these values increase to 146 and 452 W/m2K, respectively. The effective thermal conductivity of the handsheet samples was derived from measured values of overall joint conductance and interface contact conductance. The results indicate that the thermal conductivity of the bone-dry samples increases with increasing sheet density, ranging from 0.14 W/mK to 0.70 W/mK for sheet densities of 90 kg/m3 to 500 kg/m3, respectively, for the samples considered.

APA, Harvard, Vancouver, ISO, and other styles

26

Ju, Wen, Jiang Qiang Zhang, Yue Li, and Xiang Wei Liu. "Study on Application as Cigarette Paper Dry Strengthening Agent of CPAM Emulsion." Advanced Materials Research 1004-1005 (August 2014): 619–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.619.

Full text

Abstract:

Homemade water in water cationic polyacrylamide (CPAM) emulsion was applied in cigarette paper pulp as dry strengthening agent with other strengthening agent. Good collaborative effect was achieved when CPAM was used in bleached wheat straw pulp with strengthening agent E and with cationic additives L as paper pulp strengthening agent. It was also showed that distinct strengthening effect was obtained when CPAM emulsion was applied in mixture of bleached needle kraft pulp (NBKP) and wheat straw pulp, breaking length and tearing index of cigarette handsheet made of mix pulp was respectively increased by 22.2% and17.0% when the dosage of CPAM was 0.8% of dry fiber. Through analysis of cigarette handsheet section scanning electron microscopy (SEM) photos, strengthening mechanism of CPAM emulsion to cigarette paper pulp was preliminary studied.

APA, Harvard, Vancouver, ISO, and other styles

27

Switzer, Leonard H., Daniel J. Klingenberg, and C. Tim. "Handsheet formation and mechanical testing via fiber-level simulations." Nordic Pulp & Paper Research Journal 19, no. 4 (December 1, 2004): 434–39. http://dx.doi.org/10.3183/npprj-2004-19-04-p434-439.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Onuorah, E. O., J. T. Nwabanne, and E. L. C. Nnabuife. "Pulp and paper making potentials of elaeis guineensis (oil palm) grown in south east, Nigeria." World Journal of Engineering 12, no. 1 (February 1, 2015): 1–12. http://dx.doi.org/10.1260/1708-5284.12.1.1.

Full text

Abstract:

The objective of this study was to determine the pulping and paper making potentials of oil palm (E guineensis). Fibrous material from the whole trunk (WT), empty fruit bunch (EFB, fronds (FDS) and depithed trunk (DT) were evaluated using proximate chemical analysis, fiber morphological and related characteristics. Effect of active alkali (AA) % as Na2O on kraft pulping properties and the handsheet paper propertie was studied. Proximate chemical analysis reveal acceptable cellulose content for EFB (43.51%), FDS (51.13%) and DT (53.80%) while WT (32.44) is unacceptable. Low lignin content obtained (17.8−21.8%) suggests easier pulping characteristics. The high % NaOH solubility of WT (26.05%) and FDS (32.1%) suggest potential of high effluent loads. Fiber morphological studies revealed that approximately 83% of fibers are ≤ 1.5 mm in length thus putting oil palm as a short fiber source. The slenderness ratio ranges from 33.44 to 82.80; Runkelratio from 0.40 to 0.63; flexibility co-efficient from 57.20 to 71.46 and rigidity co-efficient from 0.29 to 0.43. Studies of pulping properties reveal that as active alkali % was increased the percentage total pulp yield, % screened pulp yield, % screened rejects, pulp kappa number, klason lignin and tear index of resultant pulp/handsheet all/each decreased. Conversely, as active alkali % was increased the Brust index, double fold number, breaking length, tensile index of paper handsheets and pulp brightness were each enhanced. It was concluded that in pulping of WT AA% should be < 14 and EFB pulping should be ≤ 14 in order to have acceptable yield. Also in order to have acceptable tear index, AA% should be ≤ 16. It is being recommended that trunks should be depithed in order to have acceptable yield. The fibrous material from oil palm make acceptable raw material for paper making and are good hardwood substitutes. Paper produced when bleached can be used for printing and writing papers while the unbleached grades can be used for wrapping and package papers and for corrugated boards.

APA, Harvard, Vancouver, ISO, and other styles

29

IM, WANHEE, HAK LAE LEE, HYE JUNG YOUN, and DONGIL SEO. "Structure characterization of ground calcium carbonate flocs by fractal analysis and their effects on handsheet properties." March 2013 12, no. 3 (April 1, 2013): 17–23. http://dx.doi.org/10.32964/tj12.3.17.

Full text

Abstract:

Preflocculation of filler particles before their addition to pulp stock provides the most viable and practical solution to increase filler content while minimizing strength loss. The characteristics of filler flocs, such as floc size and structure, have a strong influence on preflocculation efficiency. The influence of flocculant systems on the structural characteristics of filler flocs was examined using a mass fractal analysis method. Mass fractal dimensions of filler flocs under high shear conditions were obtained using light diffraction spectroscopy for three different flocculants. A single polymer (C-PAM), a dual cationic polymer (p-DADMAC/C-PAM) and a C-PAM/micropolymer system were used as flocculants, and their effects on handsheet properties were investigated. The C-PAM/micropolymer system gave the greatest improvement in tensile index. The mass fractal analysis showed that this can be attributed to the formation of highly dense and spherical flocs by this flocculant. A cross-sectional analysis of the handsheets showed that filler flocs with more uniform size were formed when a C-PAM/micropolymer was used. The results suggest that a better understanding of the characteristics of preflocculated fillers and their influence on the properties of paper can be gained based on a fractal analysis.

APA, Harvard, Vancouver, ISO, and other styles

30

HU, THOMAS Q., MICHELLE ZHAO, SURJIT JOHAL, BERNARD YUEN, and PAUL WATSON. "Effects of Mountain Pine Beetle Grey-Stage Infestation and Chip Moisture Content on TMP Pulping of Lodgepole Pine." May 2009 8, no. 5 (June 1, 2009): 11–18. http://dx.doi.org/10.32964/tj8.5.11.

Full text

Abstract:

We performed pilot-plant thermomechanical pulping on green and dry, mountain pine beetle-infested, grey-stage lodgepole pine sapwood chips with different moisture contents. The energy requirements and the tensile strength of the thermomechanical pulps (TMPs) from the dry, early-grey-stage chips were similar to those from the green chips, but there were indications of slightly higher energy requirements and lower tensile strength for the pulps from the late-grey-stage chips. The late- or early-grey-stage TMP had lower sheet density (because of the lower chip moisture content), lower ISO brightness, and higher handsheet surface roughness than the green TMP. Chip blends with 50% and 25% of late-grey-stage chips could be used to produce TMP pulps with energy require-ment, tensile strength, handsheet surface roughness, and density similar to those of green TMP, but with lower ISO brightness. The fiber saturation points of the green and the late-grey-stage chips were estimated to be 23.1% and 22.4% (wet basis), respectively.

APA, Harvard, Vancouver, ISO, and other styles

31

Hájková, Kateřina, Jiří Bouček, Petr Procházka, Petr Kalous, and Dominik Budský. "Nitrate-Alkaline Pulp from Non-Wood Plants." Materials 14, no. 13 (July 1, 2021): 3673. http://dx.doi.org/10.3390/ma14133673.

Full text

Abstract:

Because there is a lack of wood resources in many countries, this work focused on pulp and paper production from the waste and agricultural residues of non-wood plants. The work aimed to pulp the nitrate-alkaline of black mustard (Brassica Nigra L.) and camelina (Camelina Sativa L.). The black mustard and the camelina were selected due to the expanding planted areas of these crops in the Czech Republic. To characterize the chemical composition of black mustard and camelina, cellulose, lignin, ash, and extractives were determined. Raw alpha-cellulose, beta-cellulose, and gamma-cellulose were also measured. The results showed that the content of lignin in non-wood plants is lower than that in softwoods. The cooked pulp was characterized by the delignification degree–Kappa number. Additionally, handsheet papers were made for selected samples of pulp. The handsheet papers were characterized by tensile index, breaking length, and smoothness and compared with commonly available papers.

APA, Harvard, Vancouver, ISO, and other styles

32

Kim, Jun-Kyu, Kyoung-Hwa Choi, and Myoung-Ku Lee. "Permanent Characteristics of the Handsheet Mixed with Hemp Bast Fiber." Journal of Korea Technical Association of The Pulp and Paper Industry 46, no. 6 (December 30, 2014): 71–77. http://dx.doi.org/10.7584/ktappi.2014.46.6.071.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Choi, Kyoung-Hwa, Jun-Hyung Cho, Chang Geun Kim, Ho Sun Lee, and Jeong-Yong Ryu. "Properties of Fluff Pulp and Handsheet Recycled from Paper Diaper." Journal of Korea Technical Association of The Pulp and Paper Industry 47, no. 1 (February 28, 2015): 93–101. http://dx.doi.org/10.7584/ktappi.2015.47.1.093.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Knox, David, Peter W. Hart, Humphrey Moynihan, and Nichole Kilgore. "Physical handsheet properties of pulp furnishes containing attritor-treated fibers." January 2017 16, no. 01 (2017): 9–15. http://dx.doi.org/10.32964/tj16.1.9.

Full text

Abstract:

Several articles have been published during the past 30 years on different methods to produce micro- to nanosize cellulose particles from pulp. Unfortunately, a general lack of information exists on the impact of differing manufacturing process methods upon the product properties obtained from these differing methods. Literature data show that wet processing of small-sized cellulosic fibers generates handsheets with approximately equal or higher density and modulus of elasticity than controls for a given amount of added microcellulose. The current work evaluated small particle generation from pulp fibers via dry processing methods and compared the physical properties of dry versus wet processed particles. Dry processing to obtain microcellulose gave considerably lower sheet density and modulus as compared with wet processed microcellulose. The lower modulus can be compensated for by refining base fibers more aggressively to obtain higher density and higher modulus sheets. Dry processing methods for making microcellulose and their impact on final board properties, including modulus and smoothness, will be discussed.

APA, Harvard, Vancouver, ISO, and other styles

35

VINCENT, RÉMI, MARTINE RUEFF, and CHRISTIAN VOILLOT. "Prediction of Handsheet Tensile Strength by Computational Simulation of Structure." January 2010 9, no. 1 (February 1, 2010): 15–19. http://dx.doi.org/10.32964/tj9.1.15.

Full text

Abstract:

To better understand the influence of fiber morphology on paper properties, we developed a novel 3-D computational simulator of paper structure, which was validated through experimental work. This simulator creates virtual pieces of handsheets using the size distributions of the fibers as the main inputs. Once the structure is generated, physical properties can be assessed. The main principles of the simulation and the results for one global texture property, the apparent density, were presented in a previous paper. In this paper, we focus on the prediction of the tensile breaking strength, the most commonly used physical property for paper characterization. The model is based on the model developed by Shallhorn and Karnis, which was adapted to take into account the fiber morphological distributions. It was successfully applied in the absence of fiber breaks during the test and validated with the 10 pulps used in the first part of the study.

APA, Harvard, Vancouver, ISO, and other styles

36

Jin, Hailan, Ryota Kose, and Takayuki Okayama. "Addition of Reed-Derived Cellulose Nanofibers to Change Handsheet Properties." Journal of Fiber Science and Technology 76, no. 5 (May 30, 2020): 144–50. http://dx.doi.org/10.2115/fiberst.2020-0016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Pydimalla, Madhuri, and Ramesh Babu Adusumalli. "Unbleached and bleached handsheet characteristics of Subabul heartwood and sapwood." Nordic Pulp & Paper Research Journal 35, no. 2 (June 25, 2020): 161–71. http://dx.doi.org/10.1515/npprj-2019-0055.

Full text

Abstract:

AbstractThe objective of this study was to understand the influence of bleaching on % residual lignin, water retention value, brightness and morphological properties of Subabul heartwood and sapwood pulps. The second aim was to compare the properties of unbleached and bleached handsheets with respect to tensile index and fractography. Screened wood chips of Subabul were subjected to kraft cooking (165 °C, 3 hours) followed by ECF bleaching and refining. When unbleached handsheets were compared, higher tensile index was found for sapwood sheets (29.8 N.m/g) than heartwood sheets (12.8 N.m/g). Therefore, it is recommended to use unbleached sapwood sheets for packaging grade applications. The bleached pulps have exhibited negligible residual lignin (0.1 %), higher water retention value (∼21) and higher brightness (88 %) compared to unbleached pulps. Subsequently, the bleached heartwood sheets revealed higher tensile index (∼7 fold) and higher modulus of elasticity (∼2.7 fold) compared to unbleached heartwood sheets. For printing grade applications bleached sapwood and bleached heartwood pulps are equally recommended, because no differences were observed in their pulp and sheet characteristics.

APA, Harvard, Vancouver, ISO, and other styles

38

Kang, Hyun, Jong Myoung Won, and Byoung-Uk Cho. "Composite filler by pre-flocculation of fiber fines and PCC and its effect on paper properties." Nordic Pulp & Paper Research Journal 35, no. 2 (June 25, 2020): 251–60. http://dx.doi.org/10.1515/npprj-2019-0061.

Full text

Abstract:

AbstractA composite filler was developed by pre-flocculation of fiber fines and precipitated calcium carbonate (PCC) particles with flocculants such as cationic polyacrylamide (cPAM) and bentonite. The composite filler was compared with a conventional loading method in terms of physical properties of handsheet and filler retention. The handsheets using the composite filler showed higher strength properties than that using a conventional loading at a similar paper ash content level, implying that paper ash content can be increased maintaining same level of paper strength. Optical properties such as opacity and brightness of the paper with the composite were quite similar with the paper with the conventional loading. Filler retention of the composite filler was slightly higher than that of the conventional loading even though retention aids were not used for the composite filler. Paper formation of the composite filler was better than the case of the conventional loading. However, the sheet with the composite filler showed lower bulk than that with the conventional loading. Conclusively, the composite filler technology by pre-flocculation of fines and filler has a potential to be utilized to produce a high loaded paper.

APA, Harvard, Vancouver, ISO, and other styles

39

Liu, Na, and Jie Hu. "Fiber Modification by Laccase and a Hydrophobic Compound." Advanced Materials Research 550-553 (July 2012): 3232–36. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.3232.

Full text

Abstract:

The hydrophobicity characteristic of lignocellulosic fibers is an advantage for some paper or paperboard. In this work, the unbleached kraft pulp was treated by laccase and lauryl gallate (LG). The sizing degree, water retention value (WRV) and the wet strength of the treated fibers were studied. The optimal process conditions such as the beating degree of pulp, the drying time and drying temperature of the resulting paper for improving the sizing degree and wet strength were discussed. The results showed that the sizing degree of pulp with beating degree of 25 °SR could be increased by 4.6 times after laccase/LG treatment. The optimal drying time and temperature of the resulting handsheet was 30 min and 105°C for improving the sizing degree of pulp, respectively. The water retention value of pulp with beating degree of 25 °SR decreased. The wet/dry tensile index value of the treated pulp increased after laccase/LG treatment. The high drying temperature (above 105 °C) of handsheet helped to enhance the wet strength of pulp.

APA, Harvard, Vancouver, ISO, and other styles

40

Kim, Jeong-Jung, Dong-Uk Jang, Sang-Gu Yoon, Hyeon-Sik Shin, and Jong-Moon Park. "Changes of Handsheet Fracture Toughness by Wood and Cotton Fibers Mixing." Journal of Korea Technical Association of The Pulp and Paper Industry 46, no. 3 (June 30, 2014): 81–87. http://dx.doi.org/10.7584/ktappi.2014.46.3.081.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Karlström, Anders, and Jan Hill. "CTMP Process Optimization Part II: Reliability in Pulp and Handsheet Measurements." Nordic Pulp & Paper Research Journal 32, no. 2 (May 1, 2017): 253–65. http://dx.doi.org/10.3183/npprj-2017-32-02-p253-265.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

de Assis, Tiago, Joel Pawlak, Lokendra Pal, Hasan Jameel, Richard Venditti, Lee W. Reisinger, Dale Kavalew, and Ronalds W. Gonzalez. "Comparison of wood and non-wood market pulps for tissue paper application." BioResources 14, no. 3 (July 8, 2019): 6781–810. http://dx.doi.org/10.15376/biores.14.3.6781-6810.

Full text

Abstract:

A comparison among ten market pulps at a laboratory scale using uncreped tissue handsheets was performed to study the performance of wood and non-wood pulps for tissue manufacturing, evaluate what fiber features are desired for a specific tissue property, and determine how non-wood pulps can be used to replace or complement wood pulps in tissue products. A characterization of the fiber morphology and handsheet properties (softness, water absorbency, and strength) was performed at different mechanical refining levels. The results showed that the fiber morphology had a major impact on tissue properties. Market pulps with a combination of long fibers, high coarseness, and low fines content can provide superior bulk and water absorbency. Short fibers with thin cell walls and low fines content can impart superior softness. Bleached bamboo soda pulp can replace hardwood and softwood pulps to provide an excellent combination of water absorbency and strength. Bleached bamboo soda pulp can also replace Northern bleached softwood kraft (NBSK) pulp to impart strength without sacrificing softness. Bleached and semi-bleached wheat straw soda pulps presented a similar combination of softness and strength as Southern bleached hardwood kraft (SBHK) pulp. The wheat straw pulps can be used to replace deinked pulp (DIP) pulp to impart intermediate levels of water absorbency and strength.

APA, Harvard, Vancouver, ISO, and other styles

43

Qian, Liying, Chao Dong, Xiangtao Liang, Beihai He, and Huining Xiao. "Polyelectrolyte complex containing antimicrobial guanidine-based polymer and its adsorption on cellulose fibers." Holzforschung 68, no. 1 (January 1, 2014): 103–11. http://dx.doi.org/10.1515/hf-2012-0206.

Full text

Abstract:

Abstract Polyelectrolyte (PE) complexes (PECs) are formed by the electronic interaction between cationic and anionic PEs, and a number of factors influence the forming pattern and characteristic of the PECs. In this work, a guanidine-based polymer with high cationic charge density (CD) and low molecular weight (MW) was applied for interacting with anionic carboxymethylcellulose (CMC) with low CD and high MW. To reveal the self-assembly pattern of the PEC, the turbidity of PEC and layer-by-layer (LBL) film, along with its adsorption on cellulose fibers, was characterized. The antimicrobial activity of the handsheet containing the PEC was also investigated. The charge ratio of anionic PE to cationic PE was found to be critical to the PEC stability. The roughness of the LBL film was increased and then decreased with more bilayers assembled. The isothermal adsorption indicated that the amount of adsorbed cationic PE on cellulose fibers was increased significantly by interacting with anionic CMC. The inhibition of the cationic PE on bacterial growth was not impaired by the formation of the complex. The CMC with high MW in the complex could maintain or even improve the antimicrobial efficiency of the guanidine-based polymer in handsheet.

APA, Harvard, Vancouver, ISO, and other styles

44

Karlström, Anders, Lars Johansson, and Jan Hill. "On the modeling of tensile index from larger data sets." Nordic Pulp & Paper Research Journal 34, no. 3 (September 25, 2019): 289–303. http://dx.doi.org/10.1515/npprj-2018-0019.

Full text

Abstract:

Abstract The objective of this study is to analyze and foresee potential outliers in pulp and handsheet properties for larger data sets. The method is divided into two parts comprising a generalized Extreme Studentized Deviate (ESD) procedure for laboratory data followed by an analysis of the findings using a multivariable model based on internal variables (i. e. process variables like consistency and fiber residence time inside the refiner) as predictors. The process data used in this has been obtained from CD-82 refiners and from a laboratory test program perspective, the test series were extensive. In the procedure more than 290 samples were analyzed to get a stable outlier detection. Note, this set was obtained from pulp at one specific operating condition. When comparing such “secured data sets” with process data it is shown that an extended procedure must be performed to get data sets which cover different operating points. Here 100 pulp samples at different process conditions were analyzed. It is shown that only about 60 percent of all tensile index measurements were accepted in the procedure which indicates the need to oversample when performing extensive trials to get reliable pulp and handsheet properties in TMP and CTMP processes.

APA, Harvard, Vancouver, ISO, and other styles

45

Sung, Yong Joo, Dong Sung Kim, and Ji Young Lee. "Evaluation of Surface Coating Properties with Rice Husk Black Liquor on Handsheet." Journal of Korea Technical Association of the Pulp and Paper Industry 48, no. 6 (December 31, 2016): 182. http://dx.doi.org/10.7584/jktappi.2016.12.48.6.182.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Jin, Hailan, Kosei Watanabe, Hajime Ohtani, Jian Li, and Takayuki Okayama. "Effects of Internal Addition of Bulking Agents on Properties of Recycled Handsheet." Sen'i Gakkaishi 71, no. 6 (2015): 201–6. http://dx.doi.org/10.2115/fiber.71.201.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Lee, Jae-Hun, Kyoung-Hwa Choi, and Byoung-Uk Cho. "Changes in Handsheet Properties by Addition of the Fibrillated Cellulose Ground with CMC." Journal of Korea Technical Association of the Pulp and Paper Industry 49, no. 6 (December 31, 2017): 111–17. http://dx.doi.org/10.7584/jktappi.2017.12.49.6.111.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Choi, Kyoung-Hwa, Ah-Ram Kim, and Byoung-Uk Cho. "Changes in the Handsheet Properties by Low Concentration Sodium Hydroxide Swelling and Beating." Journal of Korea Technical Association of The Pulp and Paper Industry 46, no. 4 (August 30, 2014): 69–75. http://dx.doi.org/10.7584/ktappi.2014.46.4.069.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Wimmer, Rupert, Geoffrey Downes, Robert Evans, and Jim French. "Effects of site on fibre, kraft pulp and handsheet properties of Eucalyptus globulus." Annals of Forest Science 65, no. 6 (January 2008): 602. http://dx.doi.org/10.1051/forest:2008039.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Tomkins, Matthew, Wesley Gilbert, and Thanh Trung. "Online measurement of bulk, tensile, brightness, and ovendry content of bleached chemithermomechanical pulp using visible and near infrared spectroscopy." April 2018 17, no. 04 (May 1, 2018): 207–16. http://dx.doi.org/10.32964/tj17.04.207.

Full text

Abstract:

Current pulp mill practice to determine the pulp properties of bleached chemithermomechanical pulp (BCTMP) is to prepare and test handsheets for properties of interest. While the use of handsheets is well established, tests require well trained technical staff and introduce a significant lag before test results can be acted upon. In this report, a prototype online visible and near infrared (Vis-NIR) sensor that complements handsheet testing was trialed for 16 months at a BCTMP mill. The system consists of a cabinet located near a probe installed on a conveyor belt between a slab press and a bale press. When a bale stops on the conveyor belt, the probe rises and comes into contact with the bale, taking a spectral measurement and predicting its bulk, tensile strength, brightness, and ovendry (o.d.) content. The data presented here covers a period of 100 days of real-time measurements that correlated with laboratory tests with an R2 of 0.88 for bulk, 0.87 for tensile, and 0.92 for brightness. Bulk, tensile strength, and brightness measurements had root mean square error of prediction (RMSEP) values of 0.19 cm3/g, 3.994 Nm/g, and 0.96 brightness points, respectively. Ovendry content measurements trended with the mill’s existing online moisture measurement system and had an R2 of 0.36 and an RMSEP value of 1.04%. The quality of the correlation for o.d. content was substantially impacted because of difficulties with synchronizing the time stamps between the mill’s existing online measurements and the online system reported here. The online Vis-NIR sensor provides information in real time and has the potential to be used to reach target grade properties more quickly, assist in the identification of inefficient chemical dousing, reduce the effect of operator bias during testing, allow for the prioritizing of laboratory tests, and improve segregation of final products according to customer needs. However, further development would be necessary to use these measurements as part of a process control strategy.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Handsheet'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles