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Title: Chapter 01 Properties of Wood Related to Drying

Source: USDA Agricultural Handbook AH-188: Dry Kiln Operator's Manual

Author(s): Simpson

Publication Year: 2001  View PDF »

Related Publications: view

Category: Agricultural Handbook

Abstract: Lumber drying is one of the most time- and energyconsuming steps in processing wood products. The anatomical structure of wood limits how rapidly water can move through and out of wood. In addition, the sensitivity of the structure to stresses set up in drying limits the drying rate; rapid drying causes defects such as surface and internal checks, collapse, splits, and warp. Drying time and susceptibility to many drying defects increase at a rate that is more than proportional to wood thickness. The variability of wood properties further complicates drying. Each species has different properties, and even within species, variability in drying rate and sensitivity to drying defects impose limitations on the development of standard drying procedures. The interactions of wood, water, heat, and stress during drying are complex. The purpose of this chapter is to describe some of the fundamental properties of wood that are relevant to lumber drying. We will discuss commercial wood species, wood structure, lumber grades, water movement in wood, how wood dries, specific gravity and weight of wood, wood shrinkage, stress development during drying, and electrical and thermal properties of wood.

Keywords: Dry Kiln Operator's Manual Dry Kiln Operators Manual

File size: 792 kb(s)

Date posted: 06/10/2009

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