Strength properties of black spruce wood under different treatment

1996 ◽  
Vol 30 (6) ◽  
Author(s):  
Katerina Kwasniakova ◽  
BohuslavV. Kokta ◽  
Zoltan Koran
Keyword(s):  
Black Spruce ◽  
Strength Properties ◽  
Spruce Wood

Strength properties and density of SO 2 polluted spruce wood

1999 ◽  
Vol 57 (2) ◽  
pp. 121-128 ◽  
Author(s):  
Stefanie E. Stanzl-Tschegg ◽  
Louise Filion ◽  
Elmar K. Tschegg ◽  
Alexander Reiterer
Keyword(s):  
Strength Properties ◽  
Spruce Wood

scholarly journals Plasma Pre-treatments to Improve the Weather Resistance of Polyurethane Coatings on Black Spruce Wood

Coatings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 8 ◽  
Author(s):  
Jonathan Haase ◽  
Lukie Leung ◽  
Philip Evans
Keyword(s):  
Plasma Treatment ◽  
Black Spruce ◽  
Accelerated Weathering ◽  
Polyurethane Coatings ◽  
Plasma Treatments ◽  
Spruce Wood ◽  
Coating Type ◽  
Weather Resistance ◽  
Wood Surfaces ◽  
Modified Wood

We hypothesize that plasma treatments that increase the adhesion and penetration of transparent water, and solvent-borne polyurethane coatings into black spruce wood will improve the performance of coated wood exposed to accelerated weathering. We tested this hypothesis by modifying wood samples with plasma for 30, 180, 600, and 1200 s, and measuring coating penetration and adhesion using light microscopy and a mechanical pull-off test, respectively. Plasma treatment did not improve coating adhesion, but the solvent-borne coating showed deeper penetration into plasma-modified wood, and its resistance to accelerated weathering was better on plasma-modified wood than on untreated controls. Plasma treatments enhanced the penetration of water-borne polyurethane into wood, but the treatments did not improve weather-resistance of the coating. Plasma treatment increased the wettability of wood surfaces, and prolonged plasma treatment etched cell walls, increasing their porosity. These effects may explain the positive effect of plasma treatment on coating penetration, and the increased weather-resistance of the solvent-borne polyurethane on plasma-modified wood. In conclusion, our results indicate that the ability of plasma treatment to improve coating performance on black spruce depends on the coating type, and the effects of the treatment on the surface microstructure of wood.

scholarly journals Fractionation of lignosulphonates released during the early stages of delignification

1983 ◽  
Vol 61 (2) ◽  
pp. 416-420 ◽  
Author(s):  
Norman G. Lewis ◽  
David A. I. Goring ◽  
Alfred Wong
Keyword(s):  
Molecular Weight ◽  
High Performance ◽  
Black Spruce ◽  
Gel Permeation Chromatography ◽  
Bimodal Distribution ◽  
High Yield ◽  
Low Molecular Weight ◽  
Lower Yield ◽  
Spruce Wood ◽  
Gel Permeation

High-yield spent bisulphite liquor (HY-SBL) from sulphonated black spruce wood (Piceamariana) was fractionated by gel permeation chromatography (GPC) and by high-performance liquid chromatography (HPLC). The GPC fractionation gave a wide bimodal distribution, whereas with HPLC, a more detailed resolution was seen with the bulk of the fraction giving several clearly defined peaks. The paucidisperse material was further concentrated by a bulk fractionation of the crude SBL which included complexing the lignosulphonates with dicyclohexylamine. The isolated paucidisperse material was found to be dialyzable and to constitute 90% of the lignosulphonate in the sample of SBL. If the bisulphite pulp obtained was recooked in fresh acid sulphite liquor to a lower yield, most of the lignosulphonate dissolved was widely polydisperse with no indication of the discrete components resolvable by HPLC. However, 25% of the lignin made soluble was in the form of the paucidisperse fractions. In all, we were able to obtain about 50% of the lignin in spruce wood as a relatively low molecular weight lignosulphonate resolvable into discrete fractions by HPLC.

scholarly journals Radial trends in black spruce wood density can show an age- and growth-related decline

2014 ◽  
Vol 71 (5) ◽  
pp. 603-615 ◽  
Author(s):  
Wei Xiang ◽  
Mathew Leitch ◽  
David Auty ◽  
Emmanuel Duchateau ◽  
Alexis Achim
Keyword(s):  
Wood Density ◽  
Black Spruce ◽  
Age And Growth ◽  
Spruce Wood

Improving the Sanding Process of Black Spruce Wood for Surface Quality and Water-Based Coating Adhesion

2011 ◽  
Vol 61 (5) ◽  
pp. 372-380 ◽  
Author(s):  
Julie Cool ◽  
Roger E. Hernández
Keyword(s):  
Surface Quality ◽  
Black Spruce ◽  
Coating Adhesion ◽  
Spruce Wood ◽  
Water Based

Effect of juvenile wood on strength properties and dimensional stability of black spruce medium-density fiberboard panels

Holzforschung ◽  
2005 ◽  
Vol 59 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Jun Li Shi ◽  
Shu Yin Zhang ◽  
Bernard Riedl
Keyword(s):  
Water Absorption ◽  
Dimensional Stability ◽  
Juvenile Wood ◽  
Black Spruce ◽  
Medium Density Fiberboard ◽  
Strength Properties ◽  
Analysis Of Covariance ◽  
Modulus Of Rupture ◽  
Medium Density ◽  
Mean Values

Abstract Strength properties and dimensional stability of medium-density fiberboard (MDF) panels made from black spruce (Picea mariana [Mill.] BSP.) 0–20, 21–40, and over 40 year old fiber were studied. An analysis of covariance (ANCOVA) was performed to examine the differences in modulus of rupture (MOR), modulus of elasticity (MOE), and thickness swell (TS) of the three types of panels, while panel density was treated as a covariate in order to adjust the mean values that were partly attributed to panel density. The results indicate that MOR, internal bond (IB), and water absorption of MDF panels made from 0–20 year old fiber, which contained 100% juvenile wood, were significantly superior to those of panels made from 21–40 and over 40 year old fiber; but linear expansion (LE) of MDF panels made from 0–20 year old fiber was significantly larger than that of panels from the other two age classes. The differences in MOR, IB, water absorption, and LE between panels made from 21–40 and over 40 year old fiber were not significant. The comparisons of panel MOE and TS were relatively dependent on panel density due to existence of interactions among the three age groups.

Relative Reactivities of Middle Lamella and Secondary Wall Lignin of Black Spruce Wood

Holzforschung ◽  
1982 ◽  
Vol 36 (6) ◽  
pp. 303-306 ◽  
Author(s):  
P. Whiting ◽  
D.A.I. Goring
Keyword(s):  
Secondary Wall ◽  
Black Spruce ◽  
Middle Lamella ◽  
Spruce Wood

Ecogeographic variation in black spruce wood properties across Quebec’s boreal forest

2016 ◽  
Vol 378 ◽  
pp. 131-143 ◽  
Author(s):  
Guillaume Giroud ◽  
Jean Bégin ◽  
Maurice Defo ◽  
Chhun-Huor Ung
Keyword(s):  
Boreal Forest ◽  
Black Spruce ◽  
Wood Properties ◽  
Spruce Wood

Evaluation of two surfacing methods on black spruce wood in relation to gluing performance

2012 ◽  
Vol 59 (3) ◽  
pp. 185-194 ◽  
Author(s):  
Svetka Kuljich ◽  
Julie Cool ◽  
Roger E. Hernández
Keyword(s):  
Black Spruce ◽  
Spruce Wood

Biomechanical pulping of spruce wood chips with Streptomyces cyaneus CECT 3335 and handsheet characterization

Holzforschung ◽  
2005 ◽  
Vol 59 (2) ◽  
pp. 173-177 ◽  
Author(s):  
Manuel Hernández ◽  
M. Jesus Hernández-Coronado ◽  
M. Isabel Pérez ◽  
Esteban Revilla ◽  
Juan C. Villar ◽  
...  
Keyword(s):  
Lignin Content ◽  
Middle Lamella ◽  
Treated Wood ◽  
Strength Properties ◽  
Wood Chips ◽  
Fiber Network ◽  
Spruce Wood ◽  
Gradual Loss ◽  
Acid Soluble Lignin ◽  
Streptomyces Cyaneus

AbstractThe actinobacteriumStreptomyces cyaneusCECT 3335 was evaluated for its ability to delignify spruce wood chips (Picea abies) after 2 weeks of incubation prior to refiner mechanical pulping. Weight loss of the chips during the treatment ranged from 2% to 3%. Chemicalanalysis of the treated wood showed an increase in acid-soluble lignin content concomitant with a notable increase in the acid/aldehyde+ketone [AC/(AL+KE)] ratio of the lignin compared with the control. Structural alterations in wood cell walls were observed by optical and scanning microscopy using astra blue-safranin staining and cryosections stained with gold/palladium, respectively. A gradual loss of lignin from the lumen towards the middle lamella and incipient defiberization could be observed. The estimation of specific energy for the defibration and refining stages of treated pulp showed a 24% reduction in the energy required, largely due to a 30% saving in the defibration of chips. The analysis of handsheets obtained from treated pulp showed a notable improvement in some strength properties, such as breaking length, tear index and stretch. In addition, the high Gurley air resistance value indicates more packing of the voids of the fiber network. These results demonstrate for the first time the suitability ofStreptomyces cyaneusfor biomechanical pulping purposes.

Sign in / Sign up

Export Citation Format

Share Document