Características da Polpa kraft Extraída da Espécie Acácia-negra na Produção de Papel

Marinho, Nelson Potenciano; Klock, Umberto; Lengowski, Elaine Cristina; Muñiz, Graciela Inés Bolzón de; Zamarian, Esoline Helena Cavalli

doi:10.1590/2179-8087.099214

Cited by 7 publications

(7 citation statements)

References 5 publications

(5 reference statements)

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“…These results were also higher than the percentage of extractable compounds in the total content for E. globulus (16.4%), and compared to the results provided by other authors who worked with other species of Eucalyptus, as well as with pine and acacia. [37][38][39] The content of 1% NaOH solubles was higher than the rest of extractable compounds. The values of alternative materials were between 27-50% and, in the case of E. globulus, it was 12.4%.…”

Section: Results and Discussion Raw Material Chemical Compositionmentioning

confidence: 99%

“…In any case, the values obtained for these parameters in the alternative materials studied were similar to the results revealed by other studies for hardwood and softwood commonly used in the wood fibre industry. 35,[39][40][41][42][43] . Standard deviations of the three replicates with respect to the means were always less than 10%.…”

Section: Results and Discussion Raw Material Chemical Compositionmentioning

confidence: 99%

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Evaluation of the Potential of Alternative Vegetable Materials for Production of Paper Through Kraft Processes

Domínguez-Robles¹,

Víctor²,

Ruíz

et al. 2020

Cellulose Chem. Technol.

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The use of biomass resources different from conventional wood materials fosters the sustainable growth of the paper industrial sector and finds a development path in line with the concept of circular bioeconomy. In this work, six nonwood materials (Leucaena leucocephala, tagasaste, rice straw, Paulownia fortunei, Hesperaloe funifera and empty fruit bunches) were tested and compared to Eucalyptus globulus for paper production under Kraft conditions. All the raw materials were chemically characterized to determine holocellulose, cellulose, Klason lignin, ash, hot water solubles, 1% soda solubles and ethanol-benzene extractives. In addition, a biometric test was performed to determine the length and the width of the fibres. The cellulosic pulps obtained from the raw materials were characterized to determine their yield, viscosity, Kappa number and drainage index. As regards the paper sheets made from the cellulosic pulps, they were characterized to determine brightness, stretch and tear index. A comparison of the results suggests that these nonwood species can be used for papermaking, under Kraft operating conditions, when high-brightness paper is not required.

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Section: Results and Discussion Raw Material Chemical Compositionmentioning

confidence: 99%

Section: Results and Discussion Raw Material Chemical Compositionmentioning

confidence: 99%

Evaluation of the Potential of Alternative Vegetable Materials for Production of Paper Through Kraft Processes

Domínguez-Robles¹,

Víctor²,

Ruíz

et al. 2020

Cellulose Chem. Technol.

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“…A versatilidade da madeira permite sua utilização em vários seguimentos da economia (CHRISTOFORO et al, 2017;TAKESHITA;JANKOWSKY, 2015;MARINHO et al, 2017). Desde a sua extração na floresta nativa ou plantada (DOUGHERTY;WRIGHT, 2012;STEEGE et al, 2016), passando pelos processos industriais, consumidor e descarte final, a geração de resíduos acontece, e pode ser minimizada com o estudo prévio para o racional processamento da madeira (MANHIÇA; ROCHA; TIMOFEICZYK JUNIOR, 2013).…”

Section: Introductionunclassified

Painel híbrido OSB/MDP de madeira Pinus taeda e resina poliuretana à base de óleo de mamona

et al. 2019

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Resumo Os painéis reconstituídos à base de madeira são uma alternativa para utilização na construção civil e na indústria do mobiliário. Dentre os tipos de painéis, destacam-se o OSB (Oriented Strand Board) e o MDP (Medium Density Particleboard). O objetivo desta pesquisa foi avaliar as propriedades físicas e mecânicas de painéis híbridos OSB/MDP, visando uma alternativa de uso em novo sistema fabril com o reaproveitamento de partículas de madeira. Foram fabricados painéis OSB, híbridos e MDP em escala laboratorial e determinadas suas respectivas propriedades físicas e mecânicas de acordo com as normas EN 300:2006 e ABNT NBR 14.810-2:2013. A influência dos tipos de painéis nas propriedades foi investigada pela análise de variância (ANOVA), os testes de normalidade de Anderson-Darling (AD) e de homogeneidade de variâncias de Bartlett (Bt) foram utilizados na verificação da validade das hipóteses da ANOVA. O teste de comparações múltiplas de Tukey foi utilizado para o agrupamento dos níveis do fator (tipo de painel) nas propriedades avaliadas. Os valores obtidos para as propriedades físicas e mecânicas dos painéis híbridos OSB/MDP alcançaram os valores mínimos determinados pelas normas vigentes. Os painéis híbridos apresentaram propriedades que permitem sua aplicação estrutural e em ambientes úmidos.

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“…Estas absorvem moléculas de água, tornando a fibra mais flexível e atribuindo-lhe a habilidade de se acomodarem umas sobre a outras, aumentando a superfície de adesão e a força de ligação interfibrilares (MARINHO, et al, 2017).…”

Section: O Papel Contemporâneounclassified

“…Também devem ser consideradas as propriedades da pasta, que além de dependerem do tipo e da natureza das fibras, sofrem influência do processo de obtenção da pasta (químico, mecânico, TMP), da técnica de branqueamento, do grau de refino, da concentração e propriedades químicas das cargas e aditivos e da formação da folha (MARINHO, et al, 2017;HAVLÍNOVÁ et al, 2009).…”

Section: Ensaios De Resistência Mecânicaunclassified

Papéis para imprimir e escrever vítimas de enchente real: recuperação por radiação gama de Co-60

Auada¹

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AUADA, Fernanda Mokdessi. Papers to writing and printing recovered from flood: treatment by gama radiation from Co-60. 2018. 280 p. PhD Thesis (Doutorado em Tecnologia Nuclear)-Instituto de Pesquisas Energéticas e Nucleares-IPEN-CNEN/SP. São Paulo. This study addresses the effects of Co-60 gamma radiation on paper. Seven books of registry office archives from 21 century, recovered from flood and that presented biological infestation were selected as samples to investigate the irradiation used as fungal infection treatment. Starting with the identification of the main fungi genera present in the material to determine the doses employed, some of the radiation effects on paper properties were studied as well as on mud and fungus stains. The gamma radiation doses compatible with the possibility of repeated treatment were also observed, because treated collections are not immune to new infestations by microorganisms and the doses are cumulative. It is important to consider the dose limit which documentary and bibliographic material could support without damages in case of a new irradiation treatment.

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Características da Polpa kraft Extraída da Espécie Acácia-negra na Produção de Papel

Abstract: RESUMO

Cited by 7 publications

References 5 publications

Evaluation of the Potential of Alternative Vegetable Materials for Production of Paper Through Kraft Processes

Evaluation of the Potential of Alternative Vegetable Materials for Production of Paper Through Kraft Processes

Painel híbrido OSB/MDP de madeira Pinus taeda e resina poliuretana à base de óleo de mamona

Papéis para imprimir e escrever vítimas de enchente real: recuperação por radiação gama de Co-60

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