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Engineered Wood Products

Verification of the Key Parameters Affecting the Finger-jointing ProcessCompleted

Project leaders: Mohammad, Mohammad



The finger-jointing process is complex, with many parameters affecting joint quality, especially lumber moisture content, temperature and adhesive type. Black spruce (Picea mariana (Mill) B.S.P.) 2x3-inch blocks at various moisture contents (12%, 16%, 20% and green) and temperatures (-5, 5, 12 and 200oC) were finger-jointed using: Polymer Emulsion Polyurethane (PEP) and a new fast-curing formulation of Phenol Resorcinol Formaldehyde (PRF) resins. All specimens were tested for ultimate tensile strength (UTS) in tension after 24-hours of curing at room temperature. Microscopic analysis of the adhesive bond was performed to evaluate the glue penetration into the wood following conditioning. Results showed that the operating envelop for PEP adhesive is between l2 and 16% MC and between 5 and 20oC. The optimum moisture content for PRF adhesive was found to be around 16%. It was found that PRF adhesive performed better at high moisture content. Dry lumber caused uniform glue penetration profiles but high wood failure. Green wood resulted in irregular glue penetration profiles and failure mostly in the glue.


Start date: 2002-04-01 End date: 2003-04-30



For more information on this project, please contact:

Mohammad, Mohammad
Email: mohammad.mohammad@fpinnovations.ca
Telephone: (418) 659-2647
Fax: (418) 659-2922
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