Contactless control of the stiffness of wood products in the production line

摘要

The method involves determining gross weight of wood products e.g. square-shaped wood (2), by three measuring systems in a production line. Characteristics correlating with rigidity of the products are measured from vibration characteristics through automatic stimulation of vibration by a vibration transmitter and a computer aided analysis of acoustic and/or optically received vibrations. Rigidity of the products and/or local rigidity in various zones of the products are determined by evaluating measured data provided by the systems using a physical and/or statistical and/or heuristic model. An independent claim is also included for an arrangement for automatically sorting products in a production line.