Effect of Temperature and Clamping during Heat Treatment on Physical and Mechanical Properties of Okan (Cylicodiscus gabunensis [Taub.] Harms) Wood

Hidayat, Wahyu; Jang, Jae Hyuk; Park, Se Hwi; Qi, Yue; Febrianto, Fauzi; Lee, Seung Hwan; Kim, Nam Hun

doi:10.15376/biores.10.4.6961-6974

Cited by 18 publications

(31 citation statements)

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“…In addition, the depolymerization and shortening of the cellulose polymer decrease the MOE and MOR of wood, which reduce the flexural properties of the wood (Sweet and Winandy 1999). Similar results have been observed in previous studies (Ayrilmis et al 2009;Wahyu et al 2015;Tufan et al 2016). The significant differences (p < 0.01) in the flexural strength and flexural modulus values are shown as different letters in Table 3.…”

Section: Resultssupporting

confidence: 85%

Properties of Honeycomb Paperboards Faced with Heat-Treated Thin Medium-Density Fiberboards

Ayrılmış¹,

Kuzman²

2016

BioResources

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In this study, 4-mm-thick medium-density fiberboard (MDF) panels were heat-treated at 140 °C for 30 or 60 min and at 180 °C for 30 or 60 min. Then, 10-mm-thick lightweight honeycomb paperboards made from kraft paper ( ) values were found in the specimens faced with the untreated MDFs. The loss in strength was primarily attributable to the degradation of hemicelluloses, which are less stable to heat than cellulose and lignin. The thickness swelling and water absorption of the honeycomb paperboards faced with the heat-treated MDF panels significantly (p < 0.01) decreased with the increase in heattreatment temperature and duration.

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Section: Resultssupporting

confidence: 85%

Properties of Honeycomb Paperboards Faced with Heat-Treated Thin Medium-Density Fiberboards

Ayrılmış¹,

Kuzman²

2016

BioResources

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“…In the previous study, heat treatment of okan wood at different temperatures revealed no differences of a* values after heat treatment at 160, 180, and 200 °C as well. The a* values decreased after heat treatment at 220 °C (Hidayat et al 2015b). A previous study by Bekhta and Niemz (2003) showed that the L* and b* values were reduced with increased heat treatment duration, and that the a* value increased after heat treatment for 2 h and remained constant thereafter.…”

Section: Color Changesmentioning

confidence: 64%

“…In the previous work, as an attempt to cope with the dimensional change, a mechanical restraint was applied using a metal clamp during heat treatment at 160, 180, 200, and 220 C for 2 h. The results showed that the application of a metal clamp prevented cups, bows, and twists during heat treatment (Hidayat et al 2015a). At the same treatment temperature, the application of a metal clamp successfully prevented strength reduction by up to 20% compared with heat treatment without clamps (Hidayat et al 2015b). The results also led to the conclusion that among the temperatures studied, 180 °C was the optimal temperature to improve dimensional stability with an acceptable reduction in the mechanical strength.…”

Section: Introductionmentioning

confidence: 81%

“…The boards were stacked using a modified metal clamping method from the previous study, as shown in Fig. 1a (Hidayat et al 2015b). Each stack set consisted of six boards, i.e., three boards for color and physical properties evaluation, and three boards for mechanical properties evaluation.…”

Section: Methodsmentioning

confidence: 99%

“…Treatment commenced at room temperature, 25 ± 3 °C, and the temperature was increased to 180 °C at a heating rate of 2 °C/min. The target temperature was selected according to the previous results (Hidayat et al 2015b). The target temperature was maintained for 1, 2, 3, or 4 h. At the end of each treatment, the oven was turned off and cooled naturally to 30 °C.…”

Section: Heat Treatmentmentioning

confidence: 99%

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Effect of Treatment Duration and Clamping on the Properties of Heat-Treated Okan Wood

Hidayat¹,

Qi²,

Jang³

et al. 2016

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Effects of treatment duration and clamping during heat treatment were evaluated relative to the color and physical and mechanical properties of okan wood. Sapwood and heartwood boards from okan wood were treated with and without clamping for 1 to 4 h at 180 °C. Changes in color were mostly due to a reduction in lightness (L*) and yellow/blue chromaticity (b*). These values decreased more for longer treatment durations. Red/green chromaticity (a*) was not affected by the treatment duration. Weight loss and volume shrinkage increased with increased treatment duration. Density only slightly decreased because of a balanced reduction in weight and volume. Clamping during treatment prevented surfaces from having direct contact with the heated air, which resulted in lower weight loss and volume shrinkage than in the samples treated without clamping. Heat-treated wood absorbed less water than the control group, as suggested by the lower equilibrium moisture content and water absorption. Furthermore, the heartwood absorbed less water than the sapwood. An evaluation of the mechanical properties showed a reduction in both the modulus of rupture and modulus of elasticity after heat treatment. Clamping minimized strength reduction in both sapwood and heartwood, particularly for 1 and 2 h heat treatments.

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Comparison of physical and mechanical properties of Paulownia tomentosa and Pinus koraiensis wood heat-treated in oil and air

et al. 2022

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Effect of Temperature and Clamping during Heat Treatment on Physical and Mechanical Properties of Okan (Cylicodiscus gabunensis [Taub.] Harms) Wood

Cited by 18 publications

References 0 publications

Properties of Honeycomb Paperboards Faced with Heat-Treated Thin Medium-Density Fiberboards

Properties of Honeycomb Paperboards Faced with Heat-Treated Thin Medium-Density Fiberboards

Effect of Treatment Duration and Clamping on the Properties of Heat-Treated Okan Wood

Comparison of physical and mechanical properties of Paulownia tomentosa and Pinus koraiensis wood heat-treated in oil and air

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