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Summary
- Description:
The PDF document comprises Grade 10 Woodwork Strand 2 Materials Notes. The MS Word version (editable) is also available upon your request.
It covers the following strands and sub-strands:
- Strand 2.0: Materials
- Sub-strand 2.1: Growth of Timber Trees
- The Process of Growing Timber Trees: Biological processes including photosynthesis, cell division in the Cambium layer, and the life cycle from seedling to mature tree.
- Classification of Timber Trees: Distinction between Softwoods (Gymnosperms, needle-leaved, evergreen) and Hardwoods (Angiosperms, broad-leaved, deciduous).
- Macrostructure of Wood: Detailed examination of the trunk cross-section including Pith, Heartwood (dead support cells), Sapwood (living transport cells), Cambium Layer, Bast (Phloem), Bark, and Medullary Rays.
- Importance of Growing Trees: Environmental roles such as acting as Carbon Sinks, preventing soil erosion, and protecting water catchment areas.
- Sub-strand 2.2: Timber Conversion and Seasoning
- Transportation of Timber Logs: Methods of moving logs from the forest including Skidding, Hauling (trucks), and Water Transport.
- Timber Conversion: Methods of sawing logs into market sizes:
- Through and Through (Plain) Sawing: Simple, cheap, but prone to cupping.
- Quarter (Radial) Sawing: Stable, reveals medullary rays (figure), but expensive and wasteful.
- Tangential Sawing: Specific for flooring to resist wear.
- Timber Seasoning: The process of removing excess moisture. Comparison of Natural Air Seasoning (stacking with stickers) and Artificial Kiln Seasoning (controlled oven). Understanding Equilibrium Moisture Content (EMC).
- Defects in Seasoning: Identification of faults caused by uneven shrinkage: Cupping, Bowing, Twisting, Springing, End Splitting, and Surface Checks.
- Sub-strand 2.3: Adhesives
- Classification of Adhesives:
- Natural Adhesives: Animal Glue (Scotch glue) and Casein (Milk) glue.
- Synthetic Adhesives: Polyvinyl Acetate (PVA/White glue), Contact Adhesive (Impact glue), Epoxy Resin (two-part), Cyanoacrylate (Super Glue), and Urea Formaldehyde (Cascamite).
- Properties of Adhesives: Understanding Thermoplastic vs. Thermosetting, Water Resistance grades (D1 to D4), Pot Life, and Setting Time.
- Application Process: Steps for a strong bond: Surface Preparation (clean/dry), Application (even spreading), Clamping (pressure), and Curing.
- Safety Measures: Ventilation for solvents, PPE (gloves/masks), and fire safety hazards associated with adhesives.
- Classification of Adhesives:
- Sub-strand 2.1: Growth of Timber Trees
- Strand 2.0: Materials
- File Size:861.51 KB
- Length:29 pages
- Category:Lesson Notes
- Level:Grade 10
- Subject:WOODWORK
- Posted By:Caleb_Peter
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