How to Set the Temperature Curve of a Drying Line: Zone Control and Air Circulation

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2026-10-05 12:08

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The core of a drying line is its temperature curve. Different products, coatings and processes need different drying temperatures and times, and the line's zone control and circulating airflow serve exactly that curve.

Start with zone control. A drying line is divided into several temperature zones along its length, from low to high and then cooling. Products pass through on the conveyor, heating up, holding, then cooling down gradually. Each zone controls its own temperature, set to the product's drying curve — so the line does not blast high heat at the start, which dries the surface while the inside stays wet, or overheats and damages the product.

Circulating airflow ensures even temperature. The drying line has circulating air ducts, with hot air moving through the chamber so the temperature stays as uniform as possible at every point. With even temperature, a whole batch dries to the same result, not dry here and wet there. Duct design, air volume and outlet angle all affect how even the temperature field is.

The drying curve follows the product. Coating curing, adhesive curing and moisture evaporation each need different temperatures and times. The number of zones, their temperatures and the line speed are set to the product's process. Bigger products with thicker coatings need longer drying — a longer line with more zones; smaller, quick-drying products can use a shorter line.

A drying line is customized to the product's drying curve, output and floor space, with zones, ducts and conveying matched to the job. Huizhou Zhenxi Automation has built non-standard lines for years, with drying lines and tunnel ovens as mature categories, delivered from planning to installation and commissioning.

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