Coe’s objective is to help our customers maximize the value of each finished lumber package leaving the Planer mill. The process of maximizing value begins when the log is broken down in the Sawmill and continues through the Kilns and/or through the Planing and Grading process.
The process of Final Grading in the Planermill includes evaluation of geometric shape, as well as biological defects, and in the case of dried lumber, moisture content. The age-old challenge has been to efficiently and effectively grade the finished lumber to meet inspection bureau requirements, while at the same time minimizing above grade categorization. With today’s enhanced processing speeds, a significant challenge for increasing finished lumber value is occurring.
At speeds of 120 pieces/minute in random length and 200+ pieces/minute in studs, an individual’s ability to grade lumber with a sufficient degree of accuracy is limited. The advent of Planermill Scanning and Optimization systems has helped with recognition and classification of geometric shape thereby allowing planer mill graders to concentrate on biological defects. However, it has become increasingly difficult for a Grader to achieve the required degree of accuracy, even with the assistance of geometric scanning.
Proven Coe Vision Systems with biological defect recognition and classification capabilities are now available to capture increased value from Planermill production by enabling consistent, repeatable grading decisions. Coe Manufacturing Company has multiple systems operating in lumber operations.
The major contributors to increased value realization are:
- consistent grade decisions – results in exceeding inspection grade requirements
- minimizing above grade in packages
- significant increase in recovery of premium grades
Additional ROI considerations are the reduction of Grading Personnel resources, reducing the potential for stress injuries and Workers Compensation claims, and variable settings. With all the benefits as mentioned earlier, payback on this Coe System is expected to be one year or less.
With the addition of edge-scan BioScan™ 4x, all four board faces are scanned for visual characteristics and analyzed for the grade. Knots and splits are combined from all faces for computation of knot displacement and shake penetration.
Recent customer evaluations of the BioScan™ 4x system at Coe’s Portland facilities have shown significant opportunities for improvement in grade accuracy and increases in value realization. Based on these evaluations, several BioScan™ 4x systems have been sold recently, including Weyerhaeuser, Longview, WA, Stimson Lumber, Forest Grove, OR and J.D. Irving, Chipman, NB.
BioScan™ 4x scans lumber in a single pass without board-turning devices, therefore allowing installations with minimum space requirements. Ultra high-speed imaging electronics allow processing rates up to 240 lugs/min (studs) and 160 lugs (random length). Having already set the industry standard for visual grading, BioScan™ edge-scanning further enhances our lumber characteristic classification capabilities.
Defects in Stain
By utilizing a new feature of Coe’s proprietary Image Processing electronics, defects previously hidden in stain can now be detected and classified. This allows for improved grading accuracy of boards with blue stain or brown stain.
Separation of connected defects
In the past, knots connected to pith and splits were a challenge to classify for any machine vision system. New BioScan™ software now separates each defect component and classifies it properly, thus reducing misgrading.
New detector for MSR/Wet mark & Stain separation
A new color-sensing device is available as an add-on for D*TEC 5000 scanners. The new device has the ability to detect various color spray marks on the boards, like MSR-grade and MC indicators, and it can be used to separate various colors of stain. The new detectors will be located a couple of feet ahead of the D*TEC scanner. This development makes another stride towards fully automated grading in the planer mill.