Compounding wood-polymer composites with in-line drying technology

Composite decking has moved into the mainstream of commercialization. Manufacturers must have a process that can achieve high rates for a reasonable capital investment. The equipment must also be able to process a variety of materials so as to take advantage of formulation changes that increase quality and/or reduce costs. A single-step process is discussed that converts nondried cellulosic fibers and polyolefin resins into finished retail decking. The effect on process conditions, particularly moisture removal, is discussed. Technical as well as commercial issues are addressed. The focus of this article is the need for an integrated manufacturing system to provide the maximum economic return on investment.