In Sweden, sorting hardwood logs by quality is a common practice in the forestry industry. The logs are sorted based on various factors such as the species of the tree, the diameter of the logs, the straightness of the logs, and the absence of knots or other defects.
The sorting process is important because it ensures that the logs are used in the most efficient way possible. Higher quality logs can be used for high-value products such as furniture or flooring, while lower quality logs can be used for lower value products such as paper or pulp.
There are several norms and standards in Sweden related to sorting hardwood logs by quality. One of the most widely used standards is the Swedish Standard (SS) 3022, which provides guidelines for the visual grading of hardwood logs. This standard defines four different quality classes for logs based on their appearance and structural characteristics.
In addition to the SS 3022 standard, there are also other norms and guidelines that are used in Sweden for sorting hardwood logs by quality. These include the Nordic Timber Grading Rules, which are used to grade sawn timber, and the Swedish Forest Agency's guidelines for the measurement of timber.
Overall, the sorting of hardwood logs by quality is an important aspect of the forestry industry in Sweden, and there are well-established norms and standards in place to ensure that the process is carried out in a consistent and effective manner.