Resin efficiency : the effect of varying resin distributions upon resin performance in particleboard Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8p58pg182

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  • Past research has implied that differences in blender performance between commercial and laboratory particleboard blenders may not be attributed to resin distribution between screen fractions, as is commonly believed in the industry today, but to which particles within a screen fraction have resin and which do note To test this, the effect of varying resin distributions within screen fractions was studied and related to internal bond, modulus of rupture, modulus of elasticity, and linear expansion. A commercial particleboard furnish was screened into four different fractions, and boards were made in the laboratory in such a manner that each board had a different percentage of unblended particles of different screen fraction size. Test results showed that as the ratio of unblended particles in a board increased from 0 to 50 percent, strength properties decreased, probably due to an increasing lack of bonding sites between particles coming into contact with each other as the ratio increased. A significant finding in this study was that when the entire fines fraction (-20- mesh Tyler) was unblended, strength properties were lower than when the entire coarse fraction was unblended (+20-mesh Tyler). The reason the unblended fines had such a great influence on reducing strength properties was attributed to the extremely large relative surface area (87.8 percent of the total surface area in the board) that the fines have. When such a high percentage of surface area in a board goes unblended, strength properties tend to decrease. When the average internal bond was plotted at each ratio of unblended particles, it was determined present commercial standards (CS 236-66 Type 1B1) for internal bond of a 43 pounds per cubic foot board could be met with the laboratory blender by not blending 50 percent of the furnish in a board. If a commercial blender could obtain the efficiency of the laboratory blender, a greater percentage of particles could be blended resulting in greater internal bond properties. Substantial resin savings could then be realized by reducing the total resin content of the furnish to the point where standards could still be met. Obtaining optimum relative spread rates of resin to relative surface area in each fraction is throught to be the best solution for increasing resin efficiency in commercial particleboard blenders. The particleboard industry may be able to make resin savings by utilizing blenders in parallel to accomplish obtaining optimum relative spread rates.
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