GB/T 155-2017Defects in logs (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 155-2006 "wood defects." Compared with GB/T 155-2006, the main technical changes are as follows.

--- The following terms and definitions have been added. Ring festival, loose section, cluster festival, wheel crack, arc crack, chaos pattern, fungus discoloration, white rot, brown rot, soft Rot, chisel wormhole, wear and fat harvesting.

--- Modify, add the terms of the original standard inaccurate or improper interpretation of the terms and definitions. Asphyxia wood, bark stripping, living Festival, dead section, leakage Festival, Surface Festival, Hidden Festival, End crack, Single crack, Ring crack, Long crack, Freeze crack and Shock crack, Penetrating crack, Root hypertrophy, Pocket, Sharpening, Twist Turn the grain, stress wood, should be pressed wood, should pull wood, double heart or heartwood, tree bag, tree tumor, false heartwood, containing sapwood, heartwood discoloration and streaks, Sapwood discoloration, sapwood stains, sapwood decay, heartwood decay, insect damage, bird's eye, mechanical damage, sawing, pumping heart, dry defects, wood Structural defects, defects and injuries caused by fungi.

--- Removed the original standard in the following terms and definitions. Visible defects, lobed, split, surface pest, shallow pest, deep pest, tree Injured, torn and cut.

--- Modify some logs defects in English Notes.

--- Classification of defects has been adjusted knot according to the level of students, materials, growth sites and distribution of the classification; cracks into the crack and Rift, ring cracking and arc cracking included in the split; the tree bag from the dry defects adjusted to the structural defects of wood, and include random pattern In; fungal defects caused by fungal discoloration and decay into two categories, fungal discoloration of asphyxia browning in the sapwood discoloration, rot Rotten increase in accordance with the type and nature of divided into white rot, brown rot and soft rot; injury increased chisel hole; mechanical injury increased fat harvest injury, And the wind folding wood redraw into a category.

--- Remove the test and calculation methods.

--- Remove GB/T 155-2006 Appendix A, Appendix B. Added informative Appendix A.

1 Scope

This standard specifies the terms and definitions of conifer and broadleaf wood defects, classification.

This standard applies to softwood and hardwood logs. The original reference to the implementation.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 11917 Timber process terminology

GB/T 15787 logs inspection terms

3 Terms and definitions

GB/T 11917, GB/T 15787 and defined by the following terms and definitions apply to this document.