Carilall Engineered Wood Manufacturing Process Quiz and Flashcards

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Questions and Answers

What is the main difference between softwood and hardwood?

Softwood is denser and less permeable compared to hardwood.

Softwood comes from deciduous trees while hardwood comes from evergreen trees. (correct)

Hardwood have needles for leaves while softwood have broad-leafed leaves.

Hardwood is usually lighter in color compared to softwood.

In wood classification, which Philippine timber is an example of hardwood?

Narra (correct)

Spruce

Pine

Cedar

Which part of the tree gradually becomes the heartwood?

Branches

Roots

Cambium

Sapwood (correct)

What is the main function of the sapwood in a tree?

Transport water and nutrients from roots to leaves Signup and view all the answers

Which part of the tree contains inactive cells and serves as mechanical support?

Heartwood Signup and view all the answers

What property makes heartwood less permeable and more durable compared to sapwood?

Denser composition Signup and view all the answers

What is the common thickness range for engineered wood lumber?

2 ¼ inches to 16 inches Signup and view all the answers

What is the main difference between laminated strand lumber (LSL) and oriented strand lumber (OSL)?

The length of wood strands Signup and view all the answers

Which type of engineered wood lumber has the least strength and is the least expensive?

Laminated strand lumber (LSL) Signup and view all the answers

What is the main advantage of Laminated veneer lumber (LVL) over LSL and OSL?

Higher shear strength Signup and view all the answers

What is the typical width range for engineered wood lumber?

2-15 feet Signup and view all the answers

What is the primary reason why Laminated strand lumber (LSL) is mainly used for rim boards and short-span headers?

Least strength among composite lumber products Signup and view all the answers

Which type of wood product is made by binding or fixing wood components together with adhesives?

Engineered Wood Signup and view all the answers

What is the main advantage of engineered wood compared to solid wood?

Reduced warping and twisting Signup and view all the answers

Which type of plywood is commonly used for paneling and finishing work?

Hardwood plywood Signup and view all the answers

What is the main function of Marine Plywood or Exterior Grade Plywood?

For exterior use where waterproof glue is used Signup and view all the answers

Which property of engineered wood makes it suitable for meeting specific performance requirements?

Reduced warping Signup and view all the answers

What is the primary advantage of plywood over solid wood boards?

Approximate equalization of strength properties along its length and width Signup and view all the answers

Study Notes

Natural Wood Properties

Natural wood has a natural warmth and textured surface, increasing skin contact.
It is hygroscopic, making it a good insulator of heat.
Wood is workable, flexible, and provides good fire protection.
It has a good strength-to-weight ratio and infinite variety in color.

Wood Classification

Softwood comes from evergreen trees with needles for leaves, such as pine.
Hardwood comes from deciduous trees with broad leaves, and most Philippine timber is of this kind, such as narra.
Engineered wood, also called mass timber, composite wood, or manufactured wood, is manufactured by binding or fixing strands, particles, veneers, or boards of wood together with adhesives.

Wood Structure

Sapwood is the softer, younger part of the tree that lies between the cambium and heartwood, transporting water and nutrients from roots to leaves.
Heartwood is the older, harder central part of the tree, providing mechanical support and containing inactive cells.

Properties

The usual desired moisture content is 12%.
Engineered wood is planed or sanded before assembly to ensure good wood-to-adhesive bonding.

Engineered Wood

Engineered wood lumber, such as cross-laminated timber, has end joints that are finger-jointed and made up of an odd number of layers for a balanced structural behavior.
Common thickness ranges from 2 ¼ to 16 inches (57-400 mm), widths range from 4-15 feet (1220-4500 mm), and lengths from 40-60 feet (12-18 m).

Engineered Wood Lumber

Structural composite lumber (SCL) is a product substitute for solid lumber, made from wood veneers or wood fiber strands and glue.
SCL includes laminated strand lumber (LSL), oriented strand lumber (OSL), laminated veneer lumber (LVL), and parallel strand lumber (PSL).
LSL and OSL are made from shredded wood strands, coated with adhesive, then pressed into a rectangular cross section, and cured under heat and pressure.
LVL is made from thin wood veneer sheets, glued and laminated into thicker members, with higher shear strength than LSL and OSL.

Engineered Wood Boards

Plywood is a composite wood product made by binding or fixing wood components together with adhesives.
It is constructed by layering or arranging wood components in specific orientations to enhance structural strength and stability.
Plywood exhibits excellent strength and dimensional stability, with reduced warping, twisting, and shrinking compared to solid wood.
Types of plywood include soft plywood, hardwood plywood, and marine plywood or exterior grade plywood.

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Description

Explore the process of manufacturing engineered wood, including drying, planing, gluing, and pressing. Learn about the characteristics and dimensions of engineered wood products such as cross-laminated timber and finger-jointed end joints.

Engineered Wood Manufacturing Process

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