Log is a log that is cut into a certain length in the long direction according to the standard or special provisions of size, shape and quality, and this wood segment is called a log.
The log segment formed by the original strip is made of wood. There are those with skin and those with skin. According to the material and use value of logs, it is divided into two categories: economic timber and charcoal timber. According to its use, economic timber is divided into direct use logs and processing logs. The direct use of logs is divided into mining pit wood, house building purlins, etc. Logs for processing can also be divided into premium logs, conifer processing logs and hardwood processing logs. These logs, as the main products of the forest industry, must meet the national timber standards.
In the standard, each type of log is specified in the tree species, use, size and size upgrade, tolerance, wood defect limit, size inspection and material evaluation methods. Logs can generally be divided into long logs (more than 6 meters), medium and long logs (3~5.8 meters) and short logs (2~2.8 meters) according to their length; According to the diameter, it can generally be divided into coarse diameter wood (more than 60 cm), large diameter wood (40~58 cm), medium diameter wood (30~38 cm), small diameter wood (20~28 cm) and fine diameter wood (less than 18 cm); According to the material, it is divided into special logs, first-class logs, second-class logs, third-class logs and other external logs. The log grade is rated according to the log's own defects (knots, decay, bending, large insect eyes, cracks, etc.). The volume of logs is calculated in cubic meters, and the volume is found on the log volume table according to the diameter and length of the end face of the small head of the log.
