Power Point Presentation Unit 4 Lumber Manufacture Sawmill

Power. Point® Presentation Unit 4 Lumber Manufacture Sawmill Operations • Sawing Methods • Seasoning Methods • Planing and Grading • Lumber Defects • Wood Protective Treatment

Unit 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.

Unit 4 — Lumber Manufacture Log loaders stack logs on a truck for transport to a sawmill.

Unit 4 — Lumber Manufacture A log can be cut into many shapes and sizes of lumber.

Unit 4 — Lumber Manufacture Logs are conveyed into the sawmill from a log merchandising deck.

Unit 4 — Lumber Manufacture The logs pass through a debarker to remove bark and dirt, which may dull saw blades used in subsequent operations.

Unit 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.

Unit 4 — Lumber Manufacture Lumber sawing methods include plainsawing, quartersawing, and rift sawing.

Unit 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.

Unit 4 — Lumber Manufacture Lumber is graded and sorted according to thickness, width, and length as it moves along a conveyor belt.

Unit 4 — Lumber Manufacture Knots are found in most grades of lumber. A small number of sound knots will not significantly affect the lumber strength.

Unit 4 — Lumber Manufacture Splits and wanes are among the lumber defects that occur from natural causes.

Unit 4 — Lumber Manufacture Warpage can occur during the evaporation of water from wood cells.

Unit 4 — Lumber Manufacture Dry rot is the breakdown of wood caused by a wood‑destroying fungus.

Unit 4 — Lumber Manufacture Levels of wood deterioration vary depending on humidity levels and temperature.

Unit 4 — Lumber Manufacture Waterborne preservatives are used for residential, commercial, marine, agricultural, recreational, and industrial construction applications.

Unit 4 — Lumber Manufacture Untreated lumber is placed in large cylinders and impregnated with preservative.

Unit 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.