Control of system parameters by estimating screw withdrawal strength values of particleboards using artificial neural network-based statistical control charts

Abstract

In this study, with data obtained from a particleboard factory, screw withdrawal strength (SWS) values of particleboards were estimated using artificial neural networks (ANNs). Predictive control charts were also created. A total of seven independent variables were used for the ANN model: modulus of elasticity (MoE), surface soundness (SS), internal bond strength (IBS), density, press time, press temperature, and press pressure. The results showed that the ANN-based individual moving range (I-MR) and cumulative sum (CUSUM) control charts created for SWS values detected out-of-control signal points close to those of the real-time control charts. Among the selected independent variables, IBS was the most important parameter affecting SWS. The most suitable press temperatures and times for high SWS values were determined as 198-201 degrees C and 165-175 s, respectively. Moreover, the boards with 2500-2800 N/mm(2) MoE and 0.55 N/mm(2) IBS values exhibited the best SWS.