PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 7, Number 2, 2021
new dynamic multiblock partial least squares (DMBPLS) is proposed to extract the time- varying information in a large-scale papermaking wastewater treatment process. By introducing augmented matrices to input and output data, the proposed method not only handles the dynamic characteristic of data and reduces the time delay of fault detection, but enhances the interpretability of model. In addition, the DMBPLS provides a capability of fault location, which has certain guiding significance for fault recovery. In comparison with other models, the DMBPLS has a superior fault detection result. Specifically, the maximum fault detection rate of the DMBPLS is improved by 35.93% and 12.5% for bias and drifting faults, respectively, in comparison with partial least squares (PLS). WOOD PANEL “ Variability in moisture sorption isotherms of plywood and oriented strand board with accelerated ageing ” , Kevin Zhang and Russell Richman, Canadian Journal of Civil Engineering , online 22 July 2020. Simulation of heat and mass transfer in buildings can be a powerful tool in analyzing overall durability but is dependent on accurate input data. This study is a part of a larger study on the effects of moisture storage in a commercially available hygrothermal modelling software. Moisture storage has not been well measured historically due to time requirements and necessity, and the effects of moisture storage on modelling have not been studied extensively. This study measures sorption isotherms in plywood and oriented strand board (OSB) sheathing that has undergone accelerated ageing. Results have shown that ageing samples may not have a significant effect on sorption isotherms, however, this may be due to the accelerated ageing method. Common methods used in accelerated ageing of wood products were primarily designed for testing mechanical properties and were too destructive for measuring hygrothermal properties. Further refinement of the accelerated ageing methodology may yield improved data. “ Experimental study on correlation between adhesive penetration pattern and mechanical performances in oriented strand board ” , Hamidreza Edalat, Volker Thole & Mehdi Faezipour, European Journal of Wood and Wood Products , Vol.79, pp.59 – 74 (2021). The aim of the experimental study presented here is to investigate the correlation between adhesive penetration and mechanical performances of wood-based composites. For this purpose, oriented strand boards were made with poplar uni-strands and PF resin. To make differences in resin penetration, strand moisture content (MC) and resin solid content (SC) were selected as variables of the experiment. The adhesive penetration pattern was studied by the elemental counting method (ECM) in two layers of the boards ’ thickness. Mechanical properties including MOE, MOR, IB, tensile strength parallel to the grain, impact resistance, and creep bending were evaluated as well as resin droplets distribution. The results showed that strand MC and resin SC influence the mechanical performance and resin penetration parameters. The penetration parameters increased in the middle layer where the bondlines are close to heat and hydrodynamic pressure sources. The composites made with higher concentration resin and drier strands expressed weak penetration causing a reduction in mechanical properties except for tensile strength where the shear stress took place between bonded strands. Resin droplet size analysis proved that resin SC could change the droplet size distribution and influence the strengths. Strand MC could act as a modifying factor to develop the penetration and balance it between the layers. The results of the correlation analysis proved a significant relationship between mechanical properties and penetration parameters, in particular, those obtained from fiber quantity.
Technical Abstracts
Page 10 of 11
Made with FlippingBook Online newsletter maker