Seed storage hemicelluloses as wet-end additives in papermaking

Lima, Denis Ubeda de; Oliveira, Rubens Chaves de; Buckeridge, Marcos Silveira

doi:10.1016/s0144-8617(03)00008-0

Cited by 122 publications

(82 citation statements)

References 6 publications

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“…Thus, it makes sense to consider what would happen if hemicellulose, either in its extracted form or after modifications, were added to kraft pulp fibers -whether or not those fibers had been subjected to pre-extraction. In general, studies have shown that addition of hemicellulose products to the fiber slurry tends to increase the strength of the resulting paper (Mobarak et al 1973;Bhaduri et al 1995;Denis et al 2003;Lima et al 2003;Suurnäkki et al 2003;Ahrenstedt et al 2008;Zhang and Hu 2010;Han et al 2012;Bigand et al 2013;Lindqvist et al 2013;Hubbe 2013, 2014). Lima et al (2003) reported steeply rising dry strength upon addition of unmodified seed-derived xyloglucan to eucalyptus kraft fibers as the dosage was increased in the range zero to about 1% in the absence of any retention aid.…”

Section: Application Strategies For Dry-strength Additivesmentioning

confidence: 99%

Prospects for Maintaining Strength of Paper and Paperboard Products While Using Less Forest Resources: A Review

Hubbe¹

2013

BioResources

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Paper production requires large amounts of cellulosic fiber, whereas the world's forested lands and croplands have a finite capacity to supply such resources. To deal with likely future pressure on forest resources, as well as to hold down costs of materials, publications examined in the preparation of this review suggest that the paper industry will need to implement several concurrent strategies. In particular, the industry can be expected to view recycling as a central part of its activities. Basis weights of various paper-based products can be expected to decrease over the coming decades, and more of the fiber content will be replaced with fillers such as calcium carbonate. Such trends will place intense demands upon chemical-based strategies to enhance the bonding within paper and paperboard. Based on the literature, further progress in reducing the amount of new forest resources used to meet a given set of paper product requirements will require a combined approach, taking into account various fiber attributes, nanostructures, novel concepts in bond formation, and advances in the unit operations of papermaking.

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Section: Application Strategies For Dry-strength Additivesmentioning

confidence: 99%

Prospects for Maintaining Strength of Paper and Paperboard Products While Using Less Forest Resources: A Review

Hubbe¹

2013

BioResources

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“…Agronomy Maringá, v. 32, n. 2, p. [293][294][295][296][297][298][299]2010 Em relação à importância econômica, é fornecedora de madeira para serraria, construção civil e postes; fornece produtos fitoquímicos e medicinais, além de servir para sombreamento, cercas vivas, flora apícola, alimentação humana e animal (FERREIRA; SAMPAIO, 1999;NOGUEIRA et al, 2001;ANDRADE, 2002;LIMA et al, 2003;CARAMORI et al, 2004;FERNANDES et al, 2005). A biometria de frutos e sementes constitui importante subsídio para a diferenciação de espécies de um mesmo gênero e entre variedades de uma mesma espécie (CRUZ et al, 2001;ALVES et al, 2007).…”

Section: Introductionunclassified

Aspectos biométricos de frutos e sementes, grau de umidade e superação de dormência de jatobá

et al. 2010

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RESUMO. Este trabalho objetivou caracterizar biometricamente sementes e frutos deHymenaea courbaril L. e determinar o grau de umidade, bem como avaliar diferentes tratamentos de superação de dormência. Foram determinados a biometria, a massa de frutos e sementes e o número de sementes por fruto. As sementes foram submetidas aos seguintes cortes: 1-testemunha, sem escarificação ou corte; 2-escarificação em três faces; 3-corte ao meio e 4-corte em quatro partes. Avaliou-se também o percentual de emergência, o IVE, o comprimento da parte aérea e da raiz de plântulas. Para isso, as sementes foram submetidas à superação de dormência, com e sem embebição em água, pelos seguintes tratamentos: Iescarificação do lado oposto ao hilo; II-escarificação em uma lateral; III-escarificação em duas laterais; IV-escarificação em uma lateral e no lado oposto ao hilo; V-escarificação em duas laterais e no lado oposto ao hilo; VI-Testemunha, sem escarificação. O comprimento, a largura, o diâmetro e a massa média dos frutos foram 115,7 mm; 62,18 mm; 43,8 mm e 183,85 g, respectivamente. Para a determinação da umidade, deve-se cortar as sementes em pelo menos duas partes. A escarificação, independentemente da posição na semente, com ou sem embebição em água, possibilita maior qualidade fisiológica. ABSTRACT. Biometric aspects of fruit and seeds, moisture content and overcoming of the dormancy in jatoba. This study aimed to characterize biometrical seeds and fruits of Hymenaea courbaril L., determine the moisture content and assess different treatments to overcome dormancy. Fruit biometry, mass of fruits and seeds, and the number of seeds per fruit were determined. The seeds were submitted to the following treatments: 1-control, without cutting or scarification, 2-scarification on three sides, 3-cut in half and 4-cut in four parts. The percentage of emergence, emergence speed index, length of the buds and root of seedlings were also evaluated. So, the seeds were submitted to overcome dormancy, with and without soaking in water, represented by the following treatments: I-scarification on the opposite side of the hilum, II-scarification on one lateral side; III-scarification on two lateral sides; IV-scarification on one lateral side and on the opposite side of the hilum, V-scarification on two lateral sides and on the opposite side to hilum; VI-control without scarification. The length, width, diameter and the average mass of fruit were 115.7 mm; 62.18 mm, 43.8 mm and 183.85 g, respectively. For the determination of moisture, the seed should be cut in at least two parts. Scarification, regardless of position in seed, with or without soaking in water, allows greater physiological quality.

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“…In the simplest concept, only the glucose is fermented to bioethanol, with the by-products xylose solution and lignin pellets. The xylose sugars can be used as barrier films, hydrogels, paper additives (Söderqvist et al, 2001;Lima et al, 2003;Grönholm et al, 2004) or in xylitol production (reviewed in . At the moment, the utilization of lignin is unsatisfactory; therefore, the lignin pellets are used as solid biofuel.…”

Section: Other Concepts For the Use Of Lignocellulosic Feedstocksmentioning

confidence: 99%