Effect of using a hot-press to suppress surface checks in sugi boxed heart square timbers during the drying process

Akihiro Matsumoto, Hisato Oda, Takanori Arima, Noboru Fujimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The high temperature drying method has become popular for drying sugi (Cryptomeria japonica D.Don) boxed heart square timbers in Japan because it shortens the drying time and suppresses surface checks. However, it is well known that internal cracks and surface discoloration often occur in sugi boxed heart square timbers during the drying process. We investigated the effect of using a hot-press for suppressing surface checks in sugi boxed heart square timbers during the drying process. That is to say, the objective of this study was to reduce the damage of timbers during the drying process by shortening the high temperature drying time. The treatment for suppressing surface checks in timber is to form a surface drying set in it. This report presents the effect of using a hot-press for the formation of a surface drying set in sugi boxed heart square timbers. The results of this study are summarized below. The inside of the sugi boxed heart square timbers showed almost no drying with this surface treatment. Surface drying of the sugi boxed heart square timbers could be carried out uniformly with 30 min of hot-pressing with hardly any influence from the wide variations in moisture content. However, there was no good progress in drying over the 2nd layer under any of the test conditions. Higher plate heating temperatures resulted in deeper heating in the sugi boxed heart square timbers. In this surface treatment, the drying set was formed in the 1st layer under each test condition. However, in the 2nd and 3rd layers, the drying set was hardly formed. In this study, two types of plates were used: a flat plate with a smooth surface and a slit plate with grooves cut into the surface to make it easier for it to release vapor. However in these results, the effect of creating slits was not apparent.

Original languageEnglish
Title of host publication11th World Conference on Timber Engineering 2010, WCTE 2010
Pages293-299
Number of pages7
Volume1
Publication statusPublished - 2010
Event11th World Conference on Timber Engineering 2010, WCTE 2010 - Trentino, Italy
Duration: Jun 20 2010Jun 24 2010

Other

Other11th World Conference on Timber Engineering 2010, WCTE 2010
CountryItaly
CityTrentino
Period6/20/106/24/10

Fingerprint

timber
drying
heart
effect
heat
heating
Cryptomeria japonica
drying temperature
pressing
discoloration
vapors
shortenings
temperature
moisture content
crack
testing
Japan
water content
damage

All Science Journal Classification (ASJC) codes

  • Forestry

Cite this

Matsumoto, A., Oda, H., Arima, T., & Fujimoto, N. (2010). Effect of using a hot-press to suppress surface checks in sugi boxed heart square timbers during the drying process. In 11th World Conference on Timber Engineering 2010, WCTE 2010 (Vol. 1, pp. 293-299)

Effect of using a hot-press to suppress surface checks in sugi boxed heart square timbers during the drying process. / Matsumoto, Akihiro; Oda, Hisato; Arima, Takanori; Fujimoto, Noboru.

11th World Conference on Timber Engineering 2010, WCTE 2010. Vol. 1 2010. p. 293-299.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Matsumoto, A, Oda, H, Arima, T & Fujimoto, N 2010, Effect of using a hot-press to suppress surface checks in sugi boxed heart square timbers during the drying process. in 11th World Conference on Timber Engineering 2010, WCTE 2010. vol. 1, pp. 293-299, 11th World Conference on Timber Engineering 2010, WCTE 2010, Trentino, Italy, 6/20/10.
Matsumoto A, Oda H, Arima T, Fujimoto N. Effect of using a hot-press to suppress surface checks in sugi boxed heart square timbers during the drying process. In 11th World Conference on Timber Engineering 2010, WCTE 2010. Vol. 1. 2010. p. 293-299
Matsumoto, Akihiro ; Oda, Hisato ; Arima, Takanori ; Fujimoto, Noboru. / Effect of using a hot-press to suppress surface checks in sugi boxed heart square timbers during the drying process. 11th World Conference on Timber Engineering 2010, WCTE 2010. Vol. 1 2010. pp. 293-299
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