Author: William Turner Simpson
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 20
Book Description
Two studies were performed to characterize and control warp in nominal 2- by 4-in. (standard 38- by 89-mm) dimension lumber sawn from small-diameter ponderosa pine trees. One study was conducted at a commercial sawmill with trees harvested in central Arizona. The other study was conducted at the USDA Forest Service, Forest Products Laboratory, Madison, Wisconsin, in small experimental kilns with lumber from trees harvested in central Idaho. The three main variables in the studies were top loading, presteaming, and a high-temperature kiln schedule. A limited study of hot press drying was also included. The high-temperature kiln schedule in the experimental kilns reduced drying time to about half that of the conventional temperature schedule. Press drying time was slightly more than 3 h. Crook and bow caused most of the warp and the grade loss from warp. There was no evidence that presteaming affected warp or grade loss from warp. Top loading had a modest effect in reducing warp and grade loss from warp. High-temperature drying did not affect measured warp compared with the conventional temperature schedule. Grade loss from warp was less in high-temperature than in conventional temperature dried lumber. This might be explained by differences in moisture content change during storage. Press drying did not reduce warp or grade loss from warp.
Effect of Drying Methods on Warp and Grade of 2 by 4's from Small-diameter Ponderosa Pine
Author: William Turner Simpson
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 20
Book Description
Two studies were performed to characterize and control warp in nominal 2- by 4-in. (standard 38- by 89-mm) dimension lumber sawn from small-diameter ponderosa pine trees. One study was conducted at a commercial sawmill with trees harvested in central Arizona. The other study was conducted at the USDA Forest Service, Forest Products Laboratory, Madison, Wisconsin, in small experimental kilns with lumber from trees harvested in central Idaho. The three main variables in the studies were top loading, presteaming, and a high-temperature kiln schedule. A limited study of hot press drying was also included. The high-temperature kiln schedule in the experimental kilns reduced drying time to about half that of the conventional temperature schedule. Press drying time was slightly more than 3 h. Crook and bow caused most of the warp and the grade loss from warp. There was no evidence that presteaming affected warp or grade loss from warp. Top loading had a modest effect in reducing warp and grade loss from warp. High-temperature drying did not affect measured warp compared with the conventional temperature schedule. Grade loss from warp was less in high-temperature than in conventional temperature dried lumber. This might be explained by differences in moisture content change during storage. Press drying did not reduce warp or grade loss from warp.
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 20
Book Description
Two studies were performed to characterize and control warp in nominal 2- by 4-in. (standard 38- by 89-mm) dimension lumber sawn from small-diameter ponderosa pine trees. One study was conducted at a commercial sawmill with trees harvested in central Arizona. The other study was conducted at the USDA Forest Service, Forest Products Laboratory, Madison, Wisconsin, in small experimental kilns with lumber from trees harvested in central Idaho. The three main variables in the studies were top loading, presteaming, and a high-temperature kiln schedule. A limited study of hot press drying was also included. The high-temperature kiln schedule in the experimental kilns reduced drying time to about half that of the conventional temperature schedule. Press drying time was slightly more than 3 h. Crook and bow caused most of the warp and the grade loss from warp. There was no evidence that presteaming affected warp or grade loss from warp. Top loading had a modest effect in reducing warp and grade loss from warp. High-temperature drying did not affect measured warp compared with the conventional temperature schedule. Grade loss from warp was less in high-temperature than in conventional temperature dried lumber. This might be explained by differences in moisture content change during storage. Press drying did not reduce warp or grade loss from warp.
Effect of Drying Methods on Warp and Grade of 2 by 4's from Small-diameter Ponderosa Pine
Author: Wiiliam T. Simpson
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Effect of Drying Temperature on Warp and Downgrade of 2 by 4's from Small-diameter Ponderosa Pine
Author: William T. Simpson
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Effect of Drying Temperature on Warp and Downgrade of 2 by 4's from Small-diameter Ponderosa Pine
Author: William T. Simpson
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Research Paper FPL-RP
Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 336
Book Description
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 336
Book Description
Research Note PNW
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 340
Book Description
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 340
Book Description
Warpage of Studs from Young Growth Ponderosa Pine from Northern New Mexico
Author: Donald C. Markstrom
Publisher:
ISBN:
Category : Ponderosa pine
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category : Ponderosa pine
Languages : en
Pages : 20
Book Description
Dividends from Wood Research
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 14
Book Description
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 14
Book Description
Research Paper RM.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 482
Book Description
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 482
Book Description
General Technical Report PNW-GTR
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 754
Book Description
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 754
Book Description