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CROSS SECTIONAL ANALYSIS AND SAWING STUDIES FOR PLI, CVP INCLUDING RESINOUS DEFECTS
Service Provision Update
Article : PLI-0308 Author : D Herries
Key words: Pruned Log Index, Clearwood, Veneer Potential, Resin Pockets
March 2008
Interpine is now providing stand sampling and mill studies for PLI and CVP. This includes the incidence of resin and other randomly occurring defects. Indicative of Interpine’s commitment to progressive research based business development, this association with Interface Forest and Mill (Jim Park) compliments the range of services we currently offer in terms of resource evaluation.
Pruned Log Index (PLI) and Clear Veneer Potential (CVP) have become industry standards for the assessment of pruned log quality, in terms of clearwood potential. Together with an understanding of the knotty defect core, levels of random defects, such as resin pockets and flecking are also gathered.
Pruning is a very expensive investment, but can add a lot of value to a forest if done right. However, this value is often not fully realised if log buyers and mills do not have certainty of the quality of the clearwood within the pruned logs. If buyers are not confident in the clearwood and quality is there, they will discount their log prices or worse have an all or nothing approach and reject your entire supply of pruned logs. Forest PLI and CVP surveys ensure that forest owners gets a fair return for their pruning investment.
Surveys are undertaken by felling a sample of trees throughout a stand and cutting open the pruned logs to measure the clearwood componet. The number of trees sampled depends on the area of the pruned stand but is generally about 18. The study of the clearwood quality is then done in either of two ways:
Cross Sectional Analysis (CSA), where trees are felled by cutting into slices within the forest (upper of images below).
Sampled trees are felled and the pruned logs are sent to a sawmill where logs are cut into lumber and clearwood recovery is analysed. This way some revenue is recovered from the logs (lower of images below).
If you would like more information on these services please contact us.
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