Authors: Lauri Rautkari Kristiina Laine Andreja Kutnar Sergej Medved Mark Hughes
Publish Date: 2012/11/27
Volume: 48, Issue: 6, Pages: 2370-2375
Abstract
Solid Scots pine Pinus sylvestris L wood was surface densified to three different degrees of compression and hydrothermal posttreatment after surface densification process was performed The study determined the significance of degree of compression and hydrothermal posttreatment on the density profile generated and the resulting improved Brinell hardness It was found that different degree of compression resulted in only slightly different density profiles when compared on the absolute thickness scale Although the hydrothermal posttreatment lead to an average mass loss of 38 in surface densified specimens regardless of the degree of compression density profile of surface densified specimens was not significantly affected by hydrothermal posttreatment Furthermore the surface densification increased the Brinell hardness more than 90 Degree of compression had limited effect which means that it did not matter if the specimens were compressed from 22 to 15 mm or 18 to 15 mm the Brinell hardness was approximately the same The hydrothermal posttreatment did not reduce the Brinell hardness of control and surface densified specimens Furthermore the surface densification significantly increased the elastic recovery of surface densified wood which was measured during hardness measurements and was affected by degree of compression Additionally the hydrothermal posttreatment reduced the elastic recovery in control specimens and surface densified specimens
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