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National Repository of Grey Literature 2 records found  Search took 0.05 seconds. 
Vliv chemické modifikace na rozměrovou stabilitu ohnutých dílců z masivního bukového dřeva
 Jacko, Ondřej
This thesis deals with the effect of chemical modification on dimensional stability of bent solid beech wood samples. Acetylation at 120 ° C and steaming in saturated steam at 90 °C were chosen as chemical modification. The properties examined included dimensional stability and moisture absorption of the bent specimens. Standard samples produced were used to determine properties such as bulk swelling, moisture absorption and density. These properties were determined after modification, after long-term storage in a warehouse and after storage in an climate chamber at 20 ° C and 80% relative humidity. The air conditioning was followed by drying the bent samples to 0% humidity, which showed the dimensional stability of the bent shape. The best weight percent gain (WPG) values were achieved by standard and bent acetylated samples, the AC 2 group, which also had the most reduced RVD. The WPG for this group was 23.31%. Due to the highest WPG value, this group also achieved the best values in detecting anti-swelling efficiency (ASE), ie 81.99%. The best dimensional stability was achieved by steaming the specimens in saturated steam
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Analýza kvality konstrukčních dýh s ohledem na znehodnocující činitele
 Křenek, Radim
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