Bonding wood or other plant products using ultrasound energy

A method of manufacturing a composite wood product, comprising:

• applying a filler material to a plurality of wood elements;
• applying a compression force to the plurality of wood elements, the compression force applied by a roller element that includes a surface that applies the compression force to the plurality of wood elements;
• and
• bonding the plurality of wood elements into a composite wood product, the bonding comprising delivering ultrasound energy to the plurality of wood elements, wherein the ultrasound energy has a frequency within a frequency range of 10 kHz-20 MHz, and wherein the ultrasound energy is delivered by an ultrasound transducer via the roller element.