Chapter 8 Drying Defects
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چکیده
Effect of drying temperatures 180 Defect categories 180 Rupture of wood tissue 180 surface checks 180 End checks and splits 182 Collapse 183 H o n e y c o m b 1 8 5 Ring failure 186 Boxed-heart splits 186 Checked knots 186 Loose knots 186 Warp 187 Uneven moisture content 188 Board rejects 188 Water pockets 188 Control measures 188 Discoloration 189 Sapwood discolorations 189 Heartwood discolorations 194 Discolorations in wood containing wetwood 196 Metallic and alkaline stains 197 Removal of discoloration from dried wood 197 Drying defects of major concern in commercial woods 197 Relationships between drying defects and machining 198 Planer splits 198 Broken knots and knotholes 198 Chipped and torn grain 198 Raised grain 199 Residual drying stresses 199 End checks 199 Planer splits 199 Warp 199 Literature cited 200 Sources of additional information 200 Tables 201
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