What are the main causes of timber defects?

Answer:

The main defects caused in timber are:

  • Defects due to CONVERSION
  • Defects due to FUNGI
  • Defects due to INSECTS
  • Defects due to NATURAL FORCES
  • Defects due to SEASONING
 

Defects due to CONVERSION :

During the process of converting timber in to commercial form defects may occur:
  1. chip mark
  2. diagonal grain
  3. torn grain
  4. wane
 

Defects due to FUNGI:

  1. Blue strained
  2. brown rot
  3. dry rot
  4. heart rot
  5. wet rot
  6. white rot
  7. sap strained
 

Defects due to INSECTS :

  1. Beetles
  2. marine borers
  3. termites
 

Defects due to NATURAL FORCES :

These are casued basically due to abnormal growth and rapture of tissues :
  1. Burls
  2. callus
  3. chemical stain
  4. coarse grain
  5. dead wood
  6. druxiness
  7. foxiness ( Having reddish brown color)
  8. knots
  9. rind galls
    • cup shakes
    • heart shakes
    • ring shakes
    • star shakes
    • radial shakes
  10. SHAKES
  11. fibers
  12. upsets
  13. water strains
  14. wind cracks
 

Defects due to SEASONING :

  1. bow
  2. case hardering
  3. check
  4. collapse
  5. cup
  6. honey combining
  7. radial shakes
  8. split
  9. twist
  10. warp
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First answer by ID1941448318. Last edit by ID1941448318. Question popularity: 20 [recommend question].

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