Caracterização Anatômica De Clones Comerciais De Eucalyptus Para a Produção De Papel

Talgatti, Maiara; Silveira, Amanda Grassmann da; Baldin, Talita; Oliveira, Laura Hoffmann de; Santini, Élio José; Pasa, Débora Luana

doi:10.5380/biofix.v5i1.67625

Cited by 5 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Runkel ratio measures the degree of fiber collapse during the paper production process such that the lower the RR, the greater the collapse. This allows the fibers to have a larger contact surface, establishing a greater number of bonds, which, in turn, results in paper with greater strength to traction and overflow (Talgatti et al 2020). RR values can be classified, in general, from 0.56 as good, since Runkel (1952) proposed that fiber with an index up to 0.25 is considered excellent for paper.…”

Section: Resultsmentioning

confidence: 99%

Technological potential of fibers from 20 Hevea brasiliensis clones for use as pulp, paper, and composite materials

Amorim

Menucelli

Germano

et al. 2021

RSD

View full text Add to dashboard Cite

Based on the use of Hevea brasiliensis in latex production, the species has a consolidated role in the Brazilian economy. However, at the end of the production cycle, which lasts from 25 to 30 years, resulting wood, in general, has no added value and is normally used for firewood, without further exploring its technological properties. Seeking to introduce this species into the pulp and paper industry, we aimed to determine the fiber quality of 20 commercial clones. Wood samples were collected from planted trees (11 to 12 years old) in the municipality of Selvíria - MS. We calculated wood quality indexes of H. brasiliensis for cellulose and paper, including Flexibility coefficient, Wall proportion, Runkel ratio, Slenderness ratio (Aspect ratio), and Luce's Shape Factor. The fiber quality indexes that best indicate the potential use of wood from Hevea brasiliensis clones for cellulose and paper production were Wall Fraction, Runkel Ratio and Luce's Shape Factor, indicating that H. brasiliensis fibers, if used for proper industrial purposes, will give origin of a rigid paper with greater bonding contact on the surface. The clones that presented better results for fiber quality indexes were IAC 311, IAC 41, IAN 873, IAC 326, IAC 40 and RRIM 725. Enabling the use of wood after the latex exploratory cycle for pulp and paper will serve as a basis for genetic improvement of these clones and expansion of forest plantations for this purpose.

show abstract

Section: Resultsmentioning

confidence: 99%

Technological potential of fibers from 20 Hevea brasiliensis clones for use as pulp, paper, and composite materials

Amorim

Menucelli

Germano

et al. 2021

RSD

View full text Add to dashboard Cite

show abstract

“…closest to the overall mean fibres WF were found in the 6 th annual growth ring. According to Talgatti et al (2020), fibres with WF greater than 40% are not very flexible, i.e., are more rigid and consequently have difficulties in interconnections, which reduces the quality of the paper. However, Foelkel (1978) reports that fibres with up to 60% WF can also be used in paper production.…”

Section: Mendes Et Almentioning

confidence: 99%

Spatial variation of eucalyptus fibres considering the structure of annual growth rings

Mendes

Carneiro

Pádua

et al. 2022

CERNE

View full text Add to dashboard Cite

Background:The fibres dimensions vary along a tree trunk, and these variations are related to the apical meristem and vascular cambium activities; understanding these variations would guide the best use of wood. There have been studies on the pattern of fibres dimensions' variation along the tree trunk in the radial and longitudinal directions; however, the vast majority do not take into account the structure of the annual growth rings. Hence, this study aimed to obtain the pattern of fibres dimensions' variation and their quality indexes along the tree trunk take into account the structure of the annual growth rings. Two Eucalyptus urophylla x Eucalyptus grandis hybrid clones were used in the study. Ten-year-old trees were selected and discs were removed from 13 longitudinal positions. The disks were prepared and the growth rings were subsequently identified and the samples used for maceration were collected. Twenty fibres were measured in the annual growth rings present in each longitudinal position. Results:In the longitudinal direction, within the annual growth rings, the fibre dimensions and their quality indices did not show a well-defined pattern of variation. In the radial direction, the length, cell wall thickness, wall fraction, and Runkel ratio of the fibres tended to increase following the pith-bark direction, while the lumen diameter and flexibility coefficient decreased. Conclusion:Nevertheless, the fibre width and fibre slenderness index did not present a well-defined pattern of variation in the radial direction.

show abstract

“…Outras fibras usadas para polpação e papel apresentam valores de índice de Runkel de 1,1 para E. dunnii (Florsheim et al, 2009), 1,12 para E. camaldulensis, 0,87 para E. grandis e 0,473 a 0,609 para clones de Eucalyptus spp. (Talgatti et al 2020), 2,15 para a palha de cana-de-açúcar (Azzini et al 1996) e 0,58 para P. patula (Shimoyama & Wiecheteck, 1993).…”

Section: Caracterização Morfológica Das Fibrasunclassified

Avaliação das propriedades do bagaço de cana e bambu para produção de celulose e papel

Pego

Bianchi

Veiga

2019

RCA

View full text Add to dashboard Cite

The raw materials commonly used to produce pulp and paper in Brazil are woods from planted forests. Although with tremendous potential, the use of non-wood fibers is inexpressive. This study thus aimed to evaluate the use of sugarcane bagasse and bamboo to produce pulp and paper via physical, chemical and anatomical characterization, and to verify the influence of its properties on the process and the final product. Anatomical analysis of the fibers was performed (length and width from fibers and vessels, lumen width and cell wall thickness), as well as chemical component analysis (cellulose, hemicellulose, lignin, extractives and ash) and basic density of the materials. Moreover, felting rate, Runkel, Mulsteph and Boiler indexes, flexibility coefficient and wall fraction were generated. Results showed that both materials differed statistically in chemical properties, except for lignin content; density and anatomical properties, excluding vessel width and felting rate. Bamboo presented higher values cellulose (52.96%), minerals (2.34%), density (0.461 g/ cm³), wall fraction (67.84%) and Runkel (2.11), Mulsteph (0.90) and Boiler indices (0.81) values, whereas sugarcane bagasse presented higher hemicellulose (17.63%), extractives (12.81%) and flexibility coefficient (46.19%) values. Most properties were similar to those observed in raw materials commonly used for this purpose. Therefore, these two materials have potential for use in the pulp and paper industries.

show abstract

Caracterização Anatômica De Clones Comerciais De Eucalyptus Para a Produção De Papel

Cited by 5 publications

References 6 publications

Technological potential of fibers from 20 Hevea brasiliensis clones for use as pulp, paper, and composite materials

Technological potential of fibers from 20 Hevea brasiliensis clones for use as pulp, paper, and composite materials

Spatial variation of eucalyptus fibres considering the structure of annual growth rings

Avaliação das propriedades do bagaço de cana e bambu para produção de celulose e papel

Contact Info

Product

Resources

About