Wood Composites and Plywood
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Questions and Answers

What is the primary reason for the stability and strength of plywood?

  • The use of large sheets in its construction
  • The use of hardwood veneers
  • The cross-layering of the wood grains (correct)
  • The application of protective coatings
  • What is the name of the process of applying coatings or layers of protective material over the surface of wood?

  • Seasoning
  • Preservation (correct)
  • Deterioration
  • Treatment
  • What is the classification of plastics that can be melted and reformed multiple times?

  • Gypsum Board
  • Fiberboard
  • Thermosetting
  • Thermoplastics (correct)
  • What is the term for the thin layers of wood used in the construction of plywood?

    <p>Veneers</p> Signup and view all the answers

    What type of wood composite is characterized by being made of several thin plies of wood glued together?

    <p>Plywood</p> Signup and view all the answers

    What is the term for the center plies of plywood?

    <p>Core</p> Signup and view all the answers

    What is the purpose of cross-layering the wood grains in plywood?

    <p>To make it more stable and strong</p> Signup and view all the answers

    What is the classification of wood that is suitable for construction purposes?

    <p>Philippine Wood</p> Signup and view all the answers

    What is the primary purpose of pressure treatment in wood preservation?

    <p>To apply preservatives under pressure</p> Signup and view all the answers

    What type of plastic is known for being moldable and reusable?

    <p>Thermoplastic</p> Signup and view all the answers

    What is the term for wood materials made from a mixture of wood and other materials?

    <p>Wood composite</p> Signup and view all the answers

    What is the purpose of seasoning wood?

    <p>To dry the wood to a lower moisture content</p> Signup and view all the answers

    What is the term for a type of wood composite made from layers of wood veneer?

    <p>Plywood</p> Signup and view all the answers

    What is the primary purpose of dipping or immersing wood in a hot preservative?

    <p>To treat the wood with preservatives</p> Signup and view all the answers

    What type of plastic is known for being rigid and non-reusable?

    <p>Thermosetting plastic</p> Signup and view all the answers

    What is the term for a type of plastic sheet material?

    <p>Film</p> Signup and view all the answers

    What is the characteristic of shrinkage in wood?

    <p>Tangential shrinkage is usually twice as much as radial shrinkage</p> Signup and view all the answers

    What type of lumber is characterized by more even grain patterns?

    <p>Quarter sawn lumber</p> Signup and view all the answers

    What is the classification of plastics that can be melted and reformed multiple times?

    <p>Thermoplastics</p> Signup and view all the answers

    What is the term for the process of seasoning lumber to reduce moisture content?

    <p>Seasoning</p> Signup and view all the answers

    What type of wood composite is made from wood chips or shavings?

    <p>Chipboard</p> Signup and view all the answers

    What is the characteristic of Vertical grain lumber?

    <p>It shrinks more in thickness than in width</p> Signup and view all the answers

    What is the term for the process of treating lumber to prevent deterioration?

    <p>Preservation</p> Signup and view all the answers

    What is the type of wood composite that consists of layers of wood veneer?

    <p>Plywood</p> Signup and view all the answers

    Study Notes

    Wood and Wood Composites

    • Wood composites are produced in large sheets, usually 1220mm (4’) x 2440mm (8’).
    • Plywood is the most common wood composite, made of several thin plies or veneers of wood glued together.
    • The outside plies are called the face and the back, and the center plies are called the core.
    • The cross-layering of plywood makes it very stable and strong.

    Seasoning and Preservation

    • Seasoning is a process that helps to preserve wood.
    • Coatings or layers of protective material over the surface are good for interior purposes only.
    • The methods of applying preservatives include:
      • Pressure treatment, where wood is placed in cylinders and preservative is pumped under pressure.
      • Hot and Cold Bath Method, where wood is first placed in a bath of hot preservative and then in a bath of cold preservative.
      • Dipping or immersing the wood in a hot preservative for a short time.
      • Brushing.

    Types of Wood and Wood Composites

    • Lumber can be classified into different types, including quarter sawn lumber.
    • Quarter sawn lumber has more even grain patterns, wears more evenly with less raised grain and warping, shrinks and swells less in width, and more in thickness.
    • Wood composites include:
      • Plywood
      • Hardboard
      • Chipboard
      • Fiberboard
      • Gypsum Board
      • Fibercement Board
      • Particle Board

    Properties of Wood

    • Wood shrinks tangentially to the wood grain, usually twice as much as radial shrinkage.
    • Vertical grain lumber shrinks uniformly while plain sawn cuts near a log’s perimeter will cup away from the center.
    • The thermal expansion of wood is generally much less than volume changes due to changes in humidity.

    Millwork and Plastics

    • Millwork includes mouldings.
    • Plastics in architecture can be classified into:
      • Thermoplastics
      • Thermosetting Plastics
    • Plastics can be used to make sheets, film, and foam.

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    Description

    This quiz covers the properties and characteristics of wood composites, particularly plywood, including its construction, physical properties, and uses in construction.

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