powerpoint ® presentation unit 4 lumber manufacture sawmill operations sawing methods seasoning...
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![Page 1: PowerPoint ® Presentation Unit 4 Lumber Manufacture Sawmill Operations Sawing Methods Seasoning Methods Planing and Grading Lumber Defects Wood Protective](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649d035503460f949d6d0d/html5/thumbnails/1.jpg)
PowerPoint® PresentationPowerPoint® Presentation
Unit 4Unit 4Lumber ManufactureLumber Manufacture
Sawmill Operations • Sawing Methods • Seasoning Methods • Planing and Grading • Lumber
Defects • Wood Protective Treatment
Sawmill Operations • Sawing Methods • Seasoning Methods • Planing and Grading • Lumber
Defects • Wood Protective Treatment
![Page 2: PowerPoint ® Presentation Unit 4 Lumber Manufacture Sawmill Operations Sawing Methods Seasoning Methods Planing and Grading Lumber Defects Wood Protective](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649d035503460f949d6d0d/html5/thumbnails/2.jpg)
Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Trees are cut using a feller buncher that grasps a tree as it is sawn off at the base. Trees sustain less damage when felled in this manner.
Trees are cut using a feller buncher that grasps a tree as it is sawn off at the base. Trees sustain less damage when felled in this manner.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Log loaders stack logs on a truck for transport to a sawmill.Log loaders stack logs on a truck for transport to a sawmill.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
A log can be cut into many shapes and sizes of lumber.
A log can be cut into many shapes and sizes of lumber.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Logs are conveyed into the sawmill from a log merchandising deck.Logs are conveyed into the sawmill from a log merchandising deck.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
The logs pass through a debarker to remove bark and dirt, which may dull saw blades used in subsequent operations.
The logs pass through a debarker to remove bark and dirt, which may dull saw blades used in subsequent operations.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Boards are fed into the trimmer by conveyor belts. A trimmer consists of a series of saw blades that remove defects and cut the boards to standard lengths.
Boards are fed into the trimmer by conveyor belts. A trimmer consists of a series of saw blades that remove defects and cut the boards to standard lengths.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Lumber sawing methods include plainsawing, quartersawing, and rift sawing.Lumber sawing methods include plainsawing, quartersawing, and rift sawing.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Lumber is stacked on tram cars and transported into a kiln for seasoning. Note the stickers placed between rows of lumber to allow for complete circulation of air.
Lumber is stacked on tram cars and transported into a kiln for seasoning. Note the stickers placed between rows of lumber to allow for complete circulation of air.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Lumber is graded and sorted according to thickness, width, and length as it moves along a conveyor belt.Lumber is graded and sorted according to thickness, width, and length as it moves along a conveyor belt.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Knots are found in most grades of lumber. A small number of sound knots will not significantly affect the lumber strength.
Knots are found in most grades of lumber. A small number of sound knots will not significantly affect the lumber strength.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Splits and wanes are among the lumber defects that occur from natural causes.Splits and wanes are among the lumber defects that occur from natural causes.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Warpage can occur during the evaporation of water from wood cells.
Warpage can occur during the evaporation of water from wood cells.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Dry rot is the breakdown of wood caused by a wood‑destroying fungus.Dry rot is the breakdown of wood caused by a wood‑destroying fungus.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Levels of wood deterioration vary depending on humidity levels and temperature.
Levels of wood deterioration vary depending on humidity levels and temperature.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Waterborne preservatives are used for residential, commercial, marine, agricultural, recreational, and industrial construction applications.
Waterborne preservatives are used for residential, commercial, marine, agricultural, recreational, and industrial construction applications.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Untreated lumber is placed in large cylinders and impregnated with preservative.
Untreated lumber is placed in large cylinders and impregnated with preservative.
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Unit 4 — Lumber ManufactureUnit 4 — Lumber Manufacture
Grade marks for pressure-treated lumber include information about the exposure conditions for proper use of the lumber, and also indicate the type of preservative used on the lumber.
Grade marks for pressure-treated lumber include information about the exposure conditions for proper use of the lumber, and also indicate the type of preservative used on the lumber.