Faceglued Blockboard from Low-Grade Northern Hardwoods
Keywords:
Blockboard, lumber core, veneer, low-grade hardwoods, laminated panels strength, dimensional stability, economicsAbstract
Blockboard is a form of lumber core plywood, the latter a product that has for years been used in the United States and Canada in furniture and cabinet manufacture. A unique manufacturing process and the fact that glulines in faceglued blockboard are found only between face veneers and core serve to distinguish this product from the typical lumber core panel. Blockboard panels have become increasingly popular in northern Europe in recent years, where they have found application in products such as industrial shelving, storage units, packing cases, doors and partitions, benching, work-tops, and even combination subflooring/underlayment.
This report deals with a technical and economic evaluation of prospects for manufacture of blockboard panels from low-grade hardwoods of the United States. Faceglued blockboard was manufactured in various configurations from aspen (core) and elm (faces) and then evaluated as a general purpose structural panel. Test data indicate that blockboard panels made with a low-density hardwood core of short-length pieces would have strength and dimensional properties very similar to softwood plywood if manufactured to slightly greater thickness. Economic projections show that these thicker panels could be delivered to midwestern markets at a price very close to that of softwood plywood panels of comparable strength.
References
Bowyer, Jim L. 1979. Faceglued blockboard—an alternative to plywood? Wood Fiber 11(2):74-85.nFinnish Plywood Development Association. 1969. Finnish birch blockboard and laminboard. FDPA Technical Publication. No. 13.nGertjejansen, R., and J. Haygreen. 1973. The effect of aspen bark from butt and upper logs on the physical properties of wafer-type and flake-type particleboards. For. Prod. J. 23(9):66-71.nLee, D. G. 1966. Use the structural strength of birch blockboard. Woodworking Ind. 23(10):21-22.nSnedecor, George W., and William G. Cochran. 1967. Statistical methods. Ames: The Iowa State University Press. Pp. 285-289.nState Institute For Technical Research. 1967. Strength properties of Finnish blockboard and laminboards I. State Inst. for Tech. Res., Helsinki, Report Series 1, No. 40.n
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