Table of Contents
What are the possible defects in timber?
The followings are the five main types of defects in timber:
- Defects due to Natural Forces.
- Defects due to Attack by Insects.
- Defects due to Fungi.
- Defects due to Defective Seasoning.
- Defects due to Defective Conversion.
What is a kink defect in lumber?
kink: a localized crook, often due to a knot. cup: a warp across the width of the face, in which the edges are higher or lower than the center of the wood. twist or wind: a distortion in which the two ends do not lie on the same plane. Winding sticks assist in viewing this defect.
What is natural defect?
Natural defects occur during tree growth, with development of said defects not being able to be controlled by man. Natural defects include knots, shakes, Spalting, etc. Artificial defects are defects that are developed after the lumber has been harvested.
What is a check defect?
Check: A check is a crack that occurs along the wood’s growth rings. It does not extend through the entire thickness of the board. Knot: A knot is a naturally-occurring defect in a piece of wood. Knots are circular imperfections caused by a broken-off tree branch.
What are the various defects found in wood describe each?
Common Defects and Characteristics Found in Wood
| Bark inclusion or pocket | A piece of bark wholly or partially enclosed within the wood, which is weakened as bark a result. |
|---|---|
| Warping | Any deviation from a true or flat surface. This can include bowing, crooking, cupping, twisting or a combination of these. |
What is cupping in wood?
Cupping is a wood floor’s natural reaction to moisture. When water seeps into a plank of wood flooring, the side of the board closest to the moisture will expand. Cupping occurs when the edges of the board are higher than the center of the board, creating a concave shape.
What is natural defect in wood?
Natural Defects in Timber. This group includes all those defects: (from an engineering point of view) that are developed in a tree during its growth. Their development, therefore, cannot be controlled by man. Most common natural defects are: knots, shakes, cross grain, crookedness, rind galls, burr, and curl.
What is cupping in timber?
Cupping is the result of one side being exposed to larger moisture variations than the other. ‘Cupping’ is not a fault of a solid timber product. It is a result of storage and handling. This is an ordinary characteristic of timber that you will find in all solid wood products available.
What are some common wood defects?
Woodworkers are quite familiar with these defects – knots, splits, ugly dark streaks or stains, worm holes, even decay. Some of the more common wood defects all woodworkers face include: Bark pockets – Formed when a small piece of the bark protrudes into the lumber . This area is generally considered unsound.
What are the types of timber defects?
Natural Defects in Timber. This group includes all those defects: (from an engineering point of view) that are developed in a tree during its growth. Their development, therefore, cannot be controlled by man. Most common natural defects are: knots, shakes, cross grain, crookedness, rind galls, burr, and curl.
What is natural wood defect?
Knot is a natural wood defect. The correct answer is A. Knot is a common type of natural defect in wood. There are four basic types of knots base on the size of their diameters, they are pin, small, medium and large knots.