Lumber Processing

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LUMBER PROCESSING Course: Manufacturing II Unit: Material ID

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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

Transcript of Lumber Processing

Page 1: Lumber Processing

LUMBER PROCESSING Course: Manufacturing II

Unit: Material ID

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What is Lumber? Lumber is various lengths of wood used

in the construction and furniture making trades.

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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

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The Tree Visual inspection

Size Shape

Marked to be felled *Felled – the process of cutting down a tree

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The Saw Mill After a tree is felled it is sent to the Saw Mill

at Saw Mill Debarked

Grinder Water jets

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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)

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The Saw Mill Continued Lumber is Graded

Sent to Lumber yard to sold to you

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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.

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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.

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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.

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Air Drying Lumber

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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.

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Kiln Drying

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Kiln Drying

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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.