Correct raw material allocation to the processing industry is a key issue for the success of the forest-wood chain. The objective of this work package is to link end-products related to quality requirements for construction applications to external and internal roundwood characteristics to allow for a product-specific allocation of roundwood to its most appropriate use in construction.
Objectives of this task are to:
- define product requirements for different construction products and applications;
- link product requirements to internal and external roundwood features using existing, established quality grading standards (European standards, national standards) and scanning technology (3-D, CT); the main focus will be linking external branch dimensions and internal knot characteristics; estimate of knot free volume in the log; modelling wood density variation in a log based; derive specific descriptor sets for roundwood for most important product lines;
- develop a draft roundwood characterization system based on roundwood descriptors for specific end-product lines according to the results collected in the work described above.
- Test the new roundwood characterization system as a case study, applying a standing tree classification system and inventory data to estimate of available wood resource in the forest reflecting the defined objectives.
- Refine the classification system after evaluation on test material. Provide professional assessment of the potential properties of standing trees.
- Review of current product allocation, optimisation and reflection on development of new production strategies in the processing industry with respect to changing raw material requirements.
- Evaluation of quality descriptors for final product. To evaluate the quality descriptors of the final product and compare with existing grading standards. In order to identify the best suited roundwood raw material for particular production lines, quality descriptors for the final product and properties of importance during the production process will be transferred into round wood descriptors required in terms of external and internal features and compared with existing national and European grading standards.
Characterisation of standing trees and roundwood for final end products
Development of a classification system to use standing tree and roundwood characteristics to match with final end product characteristics for Douglas Fir and Sitka spruce. Identify limits and thresholds for round wood key characteristics in dimension and internal structure such as knot status for grading and sorting with respect to processing technology and value added wood products, so it directly connected with WP3.
Non-destructively testing for mechanical log characterisation
For evaluation of the classification system, the defined test material used in WP3 will be non-destructively tested either by ultrasound time of flight (Fibre-Gen Hitman HS) or Eigenfrequency (Microtec Viscan) for mechanical log’ characterisation will be matched with the results from WP3 on strength model predictions of roundwood from tree characteristics.
Non-destructive tomography of internal log features of Douglas fir for sawing optimisation
X-ray based computed tomography for internal log features of Douglas fir. Virtual sawing optimisation on the basis of CT scanning will be applied as evaluation method for WP3’s modelling approaches on strength grading for structural grades.