Slow or poor drying conditions can result in stains and possibly reduce the value of lumber products. Discolourations (stains) in wood have the potential to seriously downgrade and reduce the value of lumber. Even in cases where stain is admitted within grading rules, the presence of stain can have an impact on the "perceived quality" and acceptance by the customer. There are many types of stain and many points in the lumber manufacturing process where stain can develop. To cover all of the potentialtypes, causes, and preventive measures for stain would require far more than a journal article. Most stains develop as a result of the exposure conditions of logs or green lumber prior to drying and, for that reason, there is a considerable amount of material already available on that subject. A recent special publication by FPInnova-tions deals extensively with the processes of stain development and identifies prevention/ remediation treatments that address most of the pre-kiln drying stages. The publication is entitled "Wood Discolourations and Their Prevention" - Special Publication Number SP-50. For further information on this publication and how to order a copy visit our website at www.fpinnovations.ca and follow the link for "Publications". Thisarticle will deal strictly with the subject of potential for stain development due to conditions present within the dry kiln.
展开▼
