Consider the following statements with respect to defects of timber an...
Defect arises due to conversion of timber:
Chip mark, Torn grain, Diagonal grain and wane.
Defect arises due to Fungi:
Heart rot, Brown rot, White rot, Dry rot, Wet rot, Sap stain and Blue stain.
Defects arises due to Natural forces:
Cup shakes, Ring shakes, Heart shakes, Star shake and radial shake.
Defects arises due to Seasoning:
Bow, warp, cup and Twist.
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Consider the following statements with respect to defects of timber an...
Defects of Timber
There are several defects that can occur in timber, which can affect its strength, appearance, and durability. One of the defects is chip mark, which is the correct statement among the given options. Let's understand this in detail.
1. Chip Mark
- Chip mark is a defect that arises during the conversion process of timber.
- When timber is being sawn or planed, it is subjected to cutting tools that can sometimes leave marks on the surface.
- These marks are known as chip marks and they can vary in size and depth.
- Chip marks can affect the appearance of the timber and may also weaken its structural integrity.
- Therefore, timber with chip marks may not be suitable for applications where aesthetics and strength are important.
2. Brown Rot
- Brown rot is a type of wood decay caused by certain fungi.
- It is not a defect that arises during the conversion process of timber, but rather a natural process that occurs over time when timber is exposed to high moisture content.
- Brown rot fungi break down the cellulose and hemicellulose components of wood, leaving behind a brownish color and a brittle, crumbly texture.
- This type of decay can significantly weaken the timber and make it unsuitable for structural applications.
3. Natural Forces
- Bow is a type of defect that can occur in timber due to natural forces.
- It is a deformation where the timber bends or curves along its length.
- Bowing can be caused by uneven drying, improper storage, or exposure to moisture variations.
- This defect can affect the straightness and stability of the timber, making it less desirable for certain applications.
Therefore, from the given options, only statement (a) - chip mark is the defect that arises due to the conversion of timber, is correct. Brown rot is not a defect arising from conversion, but rather a natural decay process caused by fungi. Bow, on the other hand, is a defect caused by natural forces.