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What Is Pre–drying? Pre-drying is used to remove most of the free water from lumber before it is placed in a kiln for final drying. In a predryer, lumber is stacked in a building where heat and humidity are controlled. The temperature is usually kept around 90-100oF (35oC). The lumber is dried to 20- 30% moisture content, and then placed in a kiln for final drying. Though predryers cost about the same to build as kilns when you compare costs on the basis of your annual production, they require extra handling of the lumber, and they actually cost more to run than dry kilns. They are usually only used in combination with dry kilns that are old or inefficient and cannot be used to dry green lumber. Drying in a closed kiln chamber, shown here, allows accurate control over critical drying conditions such as airflow, temperature, and humidity. What Is Kiln Drying? In kiln drying, lumber is placed in a chamber where airflow, temperature, and humidity are controlled to provide as rapid drying as can be tolerated by the lumber without increasing defects. There are several types of kilns. The different types are defined by the manner in which the temperature and humidity are controlled. The three most common types of kilns are Conventional, Dehumidification, and Solar. 8PDF Image | INTRODUCTION TO KILN DRYING
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