Principles of Wood Science and Technology

Kollmann, Franz; Kuenzi, Edward W.; Stamm, Alfred J.

doi:10.1007/978-3-642-87931-9

Cited by 237 publications

(175 citation statements)

References 37 publications

(65 reference statements)

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“…particles, mean value of moisture content (MC) was 8.6%. Kollmann et al 30 and Moslemi 7 report that recommended moisture for particles should be between 3-6%. However, values reported in literature refer to particleboards made with formaldehyde based adhesives.…”

Section: Particles Characterizationmentioning

confidence: 99%

Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

et al. 2013

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Tests simulating exposure to severe weather conditions have been relevant in seeking new applications for particleboard. This study aimed to produce particleboards with residues of CCB (chromium-copper-boron oxides) impregnated Pinus sp. and castor oil-based polyurethane resin, and to evaluate their performance before and after artificial accelerated aging. Panels were produced with different particle mass, resin content and pressing time, resulting eight treatments. Particles moisture and size distribution were determined, beyond panel physical and mechanical properties, according to NBR14810-3: 2006. After characterization, treatments B and G (small adhesive consumption and better mechanical performance, respectively) were chosen to artificial aging tests. Statistical results analysis showed best performances were achieved for waterproof aged samples, of both B and G treatments. As example, in treatment B, MOR and MOE values were 23 MPa and 2,297 MPa, samples before exposure; 26 MPa and 3,185 MPa, 32 MPa and 3,982 MPa for samples after exposure (non-sealed and sealed), respectively.

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Section: Particles Characterizationmentioning

confidence: 99%

Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

et al. 2013

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“…The EMC of wood reaches a saturated point when it is no longer gaining or losing moisture; thus, dropping the EMC will decrease the moisture content. Decreasing the EMC will improve the dimensional stability (Kollmann et al 1975). As a result, the steamed compressed OPT samples had a low moisture content compared to the compressed OPT samples.…”

Section: Moisture Content and Densitymentioning

confidence: 99%

Effect of Steaming on Some Properties of Compressed Oil Palm Trunk Lumber

Salim¹,

Hashim²,

Sulaiman³

et al. 2013

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Compressed lumber is considered to be a superior structural material due to its uniform properties and higher strength than other solid timbers. This study presents the effect of steaming on some properties of compressed lumber of oil palm (Elaeis guineensis) trunks (OPT). The specimens were steamed at a temperature of 130 ⁰ C for 2 hours before being compressed in a hot press and evaluated for their physical and mechanical properties. Compressed OPT without steaming was used as a comparison sample to compare the effect of steaming on compressed OPT. The average modulus of rupture of steamed compressed OPT samples was 31.36 MPa, which was 8.7% higher than the compressed OPT without steaming samples. The modulus of elasticity was determined to be 8919 MPa, 9.9% higher than the compressed OPT samples. Steaming enhanced the dimensional properties of the samples. Thickness swelling and water absorption of the steamed compressed OPT samples were 6.57% and 33.84%, respectively, lower than those of the samples without steaming. Some other properties such as compression strength, dynamic bending strength, and the compression and recovery ratios were also evaluated. Scanning electron micrographs taken from the cross section of the samples showed a clear difference between the compressed and uncompressed oil palm.

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“…On the other hand, in densification by compression, the space volume of the wooden material decreases and densification is realized by cell wall collapse (Kutnar et al 2009). An important disadvantage of densification by the compressing method is that the wood resumes its initial dimensions before compressing when soaked in water or exposed to high relative humidity (Seborg et al 1956;Kollmann et al 1975;Kultikova 1999;Morsing 2000;Blomberg et al 2006;Pelit 2014;Pelit et al 2014). The usage of modification processes for wooden materials that involve the application of both heat and pressure are becoming more favorable; such processes are being used to extend the scope of use for various wood materials by enhancing some properties (dimensional stability, biological resistance, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermomechanical Densification and Heat Treatment on Density and Brinell Hardness of Scots Pine (Pinus sylvestris L.) and Eastern Beech (Fagus orientalis L.)

Pelit¹,

Sönmez²,

Budakçı³

2015

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The effects of thermomechanical densification (TMD) and heat treatment on density and Brinell hardness of Scots pine (Pinus sylvestris L.) and Eastern beech (Fagus orientalis L.) woods were investigated. Samples were densified using a specially designed hydraulic press with target compression ratios of 20 and 40%, and at 110 °C and 150 °C. Then, the heat treatment was applied to the samples at three different temperatures. To determine whether the changes occurred because of technological properties, tests of Brinell hardness and air-dry density were conducted. Increases of 42 and 35% were obtained for the density of Scots pine and beech samples, respectively. After the densification process, increases in radial and tangential hardness values were obtained. Decreases were observed in the density and hardness values of the samples because of the increase in temperature during heat treatment. After heat treatment, there were 4 and 5% decreases in the respective densities of Scots pine and beech, and decreases in their radial and tangential hardness values.

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Principles of Wood Science and Technology

Cited by 237 publications

References 37 publications

Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

Accelerated artificial aging of particleboards from residues of CCB treated Pinus sp. and castor oil resin

Effect of Steaming on Some Properties of Compressed Oil Palm Trunk Lumber

Effects of Thermomechanical Densification and Heat Treatment on Density and Brinell Hardness of Scots Pine (Pinus sylvestris L.) and Eastern Beech (Fagus orientalis L.)

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