24 Questions
What is the primary reason for the stability and strength of plywood?
The cross-layering of the wood grains
What is the name of the process of applying coatings or layers of protective material over the surface of wood?
Preservation
What is the classification of plastics that can be melted and reformed multiple times?
Thermoplastics
What is the term for the thin layers of wood used in the construction of plywood?
Veneers
What type of wood composite is characterized by being made of several thin plies of wood glued together?
Plywood
What is the term for the center plies of plywood?
Core
What is the purpose of cross-layering the wood grains in plywood?
To make it more stable and strong
What is the classification of wood that is suitable for construction purposes?
Philippine Wood
What is the primary purpose of pressure treatment in wood preservation?
To apply preservatives under pressure
What type of plastic is known for being moldable and reusable?
Thermoplastic
What is the term for wood materials made from a mixture of wood and other materials?
Wood composite
What is the purpose of seasoning wood?
To dry the wood to a lower moisture content
What is the term for a type of wood composite made from layers of wood veneer?
Plywood
What is the primary purpose of dipping or immersing wood in a hot preservative?
To treat the wood with preservatives
What type of plastic is known for being rigid and non-reusable?
Thermosetting plastic
What is the term for a type of plastic sheet material?
Film
What is the characteristic of shrinkage in wood?
Tangential shrinkage is usually twice as much as radial shrinkage
What type of lumber is characterized by more even grain patterns?
Quarter sawn lumber
What is the classification of plastics that can be melted and reformed multiple times?
Thermoplastics
What is the term for the process of seasoning lumber to reduce moisture content?
Seasoning
What type of wood composite is made from wood chips or shavings?
Chipboard
What is the characteristic of Vertical grain lumber?
It shrinks more in thickness than in width
What is the term for the process of treating lumber to prevent deterioration?
Preservation
What is the type of wood composite that consists of layers of wood veneer?
Plywood
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.
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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