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Wood

Wood. Name 5 objects that are made out of wood. Is the same TYPE of wood used in all of these objects? If not, how does the wood differ? What types of trees are used to make wood? What part of a tree is used to manufacture wood?

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Wood

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  1. Wood • Name 5 objects that are made out of wood. Is the same TYPE of wood used in all of these objects? If not, how does the wood differ? • What types of trees are used to make wood? What part of a tree is used to manufacture wood? • What mechanical properties does wood possess? What factors can effect the mechanical properties of wood? • Why is wood a commonly used material in the manufacture of technical objects? • What is modified wood made of and what is the advantage of using this material over natural wood?

  2. Wood TerminologyHard wood—Soft woods • All native species of trees are divided into two classes. • Hard wood have broad leaves and are deciduous • ex: Maple, yellow birch, oak • Soft woods are conifers • ex: spruce, pine, cedar

  3. Materials obtained from trees come from… Sap wood Bark • Sapwood: the outer portion that conducts sap and has the living cells. • Heartwood : the inactive cells in the inner portion. • Mineral deposits may cause darker color. • Deposits make wood more durable. Heart wood Tree roots, branches and bark have little to no commercial value

  4. Wood Terminology--cont.Growth rings Summerwood • Because the rate a tree grows change with the seasons, a cross section will show distinctive rings. • Springwood • Inner part of the growth ring • Usually larger cavities and thin walls • Summerwood • Outer part of growth ring • Smaller cells and thicker walls. • A tree grows one springwood and one summerwood ring each year. • Used to age trees Springwood

  5. Wood Terminology--cont.Sawing Direction • Plain sawn (Flat sawn) • Board is sawed “parallel” to growth rings • Most common boards. • Quarter sawn • Log is first quartered • Boards are cut “perpendicular” to the grain. • Usually must be special ordered. Were have you seen quarter sawn boards used?

  6. What factors can effect the mechanical properties of wood? Why is wood a commonly used material in the manufacture of technical objects?

  7. 5) What is modified wood made out of? Modified wood is treated wood or material made with wood mixed with other substances such as glue, plastics or preservatives.

  8. p. 377

  9. Treated Wood

  10. Laminated Wood

  11. Plywood

  12. Particle Board

  13. Fiberboard

  14. 5) What is the advantage of using this modified wood over natural wood?

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