Graduate Thesis Or Dissertation
 

Growth ring pattern consideration in computer sawing simulation

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  • The Best Opening Face (BOF) log breakdown model was modified to keep track of growth ring angle and growth ring density in boards. The model was used to determine the effects of producing rectangular rather than square pencil stock. While an increase in volume did result, there was also a decrease in pencil stock quality regarding ring angle due to the lack of choice left in orienting these pencil stock when producing slats. The results were expressed as the percentage of change that occurred in both volume and value recovery between rectangular and square sawing. Overall, when considering both pencil stock prices and ring angle factors, there was an increase in value of 0.64% when sawing rectangles instead of squares. However, a high standard deviation of 1.97% was linked to that average. No trends were found as a function of log diameter, but the total value increased slightly with an increase in log length and taper rate. From a pencil stock seller's viewpoint, only pencil stock prices needed to be considered. Due primarily to an increase in volume recovery, there was an average value increase of 6.85% when sawing rectangles instead of squares. Once again, an increasing trend was observed as a function of log length and taper rate. From a pencil slats producer's viewpoint, a per board foot approach was taken. An average decrease in value of 6.51% per board foot resulted when rectangles were sawn instead of squares. In addition, the distribution of pencil stock in the three ring angle classes varied dramatically between rectangular and square sawing. Results were sensitive to relative prices given to pencil slats as a function of ring angle.
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