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Lumber Processing . Course : Manufacturing II Unit: Material ID. What is Lumber?. Lumber is various lengths of wood used in the construction and furniture making trades. Steps In Producing Lumber. Starts with tree Cut/ debranched and sent to sawmill Sorted and cut Circular saw Band Saw - PowerPoint PPT Presentation
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LUMBER PROCESSING Course: Manufacturing II
Unit: Material ID
What is Lumber? Lumber is various lengths of wood used
in the construction and furniture making trades.
Steps In Producing Lumber Starts with tree Cut/debranched and sent to sawmill Sorted and cut
Circular saw Band Saw
Dried Air Kiln
Grade Distributed
The Tree Visual inspection
Size Shape
Marked to be felled *Felled – the process of cutting down a tree
The Saw Mill After a tree is felled it is sent to the Saw Mill
at Saw Mill Debarked
Grinder Water jets
The Saw Mill Continued Log cut to length or bucking
Log cut into strips the length of log Plain Sawn Quarter Sawn
Drying the lumber Air Dry (10-12% Moisture) Kiln Dry (6-8% Moisture)
The Saw Mill Continued Lumber is Graded
Sent to Lumber yard to sold to you
Plain Sawn Lumber Plain sawn wood is the type most
typically seen today. When the log is cut in to planks all the cuts are parallel to each other.
Quarter Sawn Lumber With Quarter sawn wood the log is first
quartered (hence quarter sawn) and then diagonally from the center.
This results in a grain that is more vertical when looking at the plank end on.
Air Drying Lumber To air dry the lumber is arranged in layers
or courses Separating stickers are place between
boards and the boards are then stacked Boards are stored outdoors so that
atmospheric air can circulate through the piles and carry away moisture
Reduces moisture to about 10-12 percent.
Air Drying Lumber
Kiln Drying Lumber Lumber is dried in a closed chamber Controlling the temperature, relative
humidity, and air circulation. Wood reaches a predetermined moisture
content. Seven percent moisture – four to five
days.
Kiln Drying
Kiln Drying
15
Wood StructureRadio Frequency (RF) Heat waves, a unique technology utilizes
electromagnetic waves Radio Frequency spectrum to heat
products within a vacuum controlled environment.
Heat wave kilns use amplifier based power generators to create the radio frequency field which heats each load. Drying time for hardwoods – 24 hours.
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