A system of equations for prediction of plywood veneer total yield and yield by grade for loblolly pine plywood bolts

A system of equations was developed that predicts square foot veneer total yield and yield by grade for loblolly pine (Pinus taeda L.) plywood bolts. The system predicts square foot yields based on a 1/8-inch peel for all veneer, grade B and better full sheets, grade C full sheets, grade D full shee...

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Bibliographic Details
Published in:Forest products journal 1998-05, Vol.48 (5), p.80-88
Main Authors: Lynch, T.B. (Oklahoma State University, Stillwater, OK.), Clutter, M.L
Format: Article
Language:English
Subjects:
Applied sciences
CHAPAS DE MADERA
CONTREPLAQUE
Estimating techniques
Exact sciences and technology
FORECASTING
Forest products industry
Independent variables
MATEMATICAS
Mathematical analysis
MATHEMATICS
MATHEMATIQUE
Mechanical woodworking and drying
PINUS TAEDA
PLACAGE
PLYWOOD
Polymer industry, paints, wood
RENDEMENT
RENDIMIENTO
Studies
TABLEROS CONTRACHAPEADOS
TECHNIQUE DE PREVISION
TECNICAS DE PREDICCION
Variables
VENEERS
Wood
Wood products
Wood. Paper. Non wovens
YIELDS
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Summary:A system of equations was developed that predicts square foot veneer total yield and yield by grade for loblolly pine (Pinus taeda L.) plywood bolts. The system predicts square foot yields based on a 1/8-inch peel for all veneer, grade B and better full sheets, grade C full sheets, grade D full sheets, a miscellaneous category consisting of grade C and better strips as well as fishtail and centercut, and a category consisting of grade D strip and D sawcore (full sheets that cannot meet requirements for grade D). The equation for prediction of total square foot veneer yield is a linear function of bolt volume within the small-end diameter inside bark (SEDib) excluding the core, and volume in the tapering portion of the bolt outside the cylinder defined by SEDib. Equations for grade yield are constructed by multiplying predicted total yield by a function that predicts the ratio of yield in a particular grade to total yield. Therefore, the system is constrained so that predicted total yield is equal to the sum of predicted yields by grade category. The ratio function depends on independent variables such as bolt grade, SEDib, and bolt position in the tree. Since total volume was a dependent variable in one of the system equations and a predictive variable in other nonlinear system equations, nonlinear 3-stage least squares techniques were used to estimate parameters in the system
ISSN:0015-7473
2376-9637