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Lumber. Wood. Tree Growth. 1. Dead Bark – Protective Layer 2. Living Bark – Composed of hollow longitudinal cells that conduct nutrients down the truck from the leaves to the roots
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HARDWOOD LUMBER. CROSS SECTION OF A TREE. GRADING HARDWOODS. Hardwood lumber is graded on the basis of the size and # of cuttings which can be obtained from a board. What things might limit the number and size of cuttings? Splits Knots Bark Rot. GRADING HARDWOODS.
FW1035 Lecture 13 Bowyer et al, Chapter 13. Lumber Grades. Grading is typically by: Strength 1. Visual Estimation 2. Measured Appearance Specialty product needs. Hardwood Lumber Grading. Factory Lumber Lengths from 4 to 16 feet in one foot increments, random widths.
FW1035 Lecture 12 Bowyer et al, Chapter 13. Lumber Production. Sawmill Goals. Maximize the value and yield of the primary final product (lumber) Maximize value and yield of secondary products (2006 numbers for softwood mills) Chips – 95% pulp Sawdust and planer shavings
Engineered Lumber. Oriented Strand Board (OSB). OSB is manufactured from waterproof heat-cured adhesives and rectangular shaped wood strands that are arranged in cross-oriented layers, similar to plywood.
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