High performance, uniform density, price competitive alternative to Amazon balsa wood AND PET foam
Wind turbine blades, airplanes and boats are made from balsa wood which has low density and high strength. These unique characteristics deliver the necessary compressive and sheer strength, fatigue and impact performance.
In the case of wind turbine blades, shaped balsa wood is sandwiched in the core of the blade and surrounded with styrene resonated glass fibre mats. Today’s giant 100m+ blades require 150 cubic meters of balsa.
Balsa is harvested from Amazon rainforests vital for carbon capture and the livelihood and sustainability of indigenous communities. Thanks to dramatically increasing demand for renewable energy, supplies are now limited and very expensive. Legal balsa exports doubled between 2019 and 2020 and by 2020 demand outstripped supply and balsa prices tripled.
Historically, Ecuador supplied more than 95% of commercial balsa until those forests were exterminated. About 60% of balsa is now plantation grown to ensure a consistent supply for wind blade manufacturing. It has also moved to Peru where a black market is thriving thanks to reduction in controls as a result of the pandemic.
Balsa is fast-growing but doesn’t grow quickly enough on balsa plantations to extract whole logs large enough to cut long boards. Manufacturers have resorted to gluing together cross-cut squares from trunks of trees to form stress skin panels.
This development has added considerable cost to manufacturing balsa dimensional sheets, since each cross-cut section of tree stalk has to be cut in a rectangular shape to allow block-to-block gluing to form desired planks. In addition, cross-cut balsa planks have very little flexural modulus strength due to loading being applied in the fiber direction, rather than across the fiber direction as is typical for normal wood products. To strengthen cross-cut balsa, manufacturers add toxic styrene adhesives and glass fibre, which is energy intensive to manufacture.
As the supply of balsa diminishes and the cost increases, one leading blade manufacturer has resorted to using PET and PVC foams in blade tips, however balsa is still required to provide shear modulus for the root section of the blade. Neither PET or PVC are price competitive or sustainable.
INCA BioBalsa is the high performance, sustainable, price competitive alternative
Constructed from hemp hurd cellulose, BioBalsa offers comparable density to balsa of 10 lbs/ft3 (160 kg/m3) — but with better compressive strength thanks to randomness of fibre placement — which delivers uniform strength in all directions. Unlike balsa, it can be formulated to reject moisture and adjusted to specific binding resins and flame resistance specifications. Similar to balsa, but unlike PET and PVC, it has the sheer strength required for installation in all sections of the wind turbine blade – including the root section.
Versus balsa, PET or PVC, INCA BioBalsa is sustainable at every stage of its lifecycle. While growing, hemp sequesters 8-15 tonnes of CO2E per hectare.
INCA acquires hemp from the Canadian Prairies where hemp is sustainably grown for protein. INCA decorticates the waste stream into fibre and hurd for our advanced composites product line. This puts the waste biomass to productive use and provides farmers with an additional revenue stream.
Our manufacturing process results in significant reductions in carbon emissions and waste versus the alternatives. After decommissioning, new technologies have been developed that will enable blades to be deconstructed and the individual materials recycled. INCA BioBalsa will be 100% made in Canada.
INCA BioBalsa delivers high performance and 164% less carbon impact than PET and 107% less than balsa
The industries we serve are actively seeking an alternative core material... We believe that INCA’s BioBalsa panels may be this alternative...
“Gurit provides advanced composite solutions to the wind energy, marine and other industries. Our portfolio of structural core materials, prepregs, adhesives, and engineering services is recognized world-wide. The industries we serve are actively seeking an alternative core material that can deliver the compressive and sheer strength of balsa. Our customers also share aggressive sustainability goals. We believe that INCA’s BioBalsa panels may be this alternative and look forward to partnering with them to develop and, if proven successful, to commercialize the product.”
Chief Technology Officer
Protects Rainforest Habitat and Species
The Alberta government says hemp is part of an agri-food investment and growth strategy developed under its economic recovery plan. | File photo
Two companies will receive a maximum of $900,000 to transform Alberta’s hemp industry.
“I really mean it when I …