How should nylon be dried?
Most manufacturers supply nylon in moisture-resistant packaging, with a moisture content of 0.2 % or less. If the packaging is unopened and undamaged, it should be ready to process if transferred to the molding machine with minimal contact with the atmosphere. Most molders prefer to load the material into a hopper dryer for an added margin of safety. The hopper dryer must be a dehumidifying dryer. Air temperatures less than 180 °F (80 °C) are recommended to prevent yellowing of the pellets. Reground material and pellets from open containers need to be dried to below 0.2 % (or even less, depending upon the manufacturers’ recommendation). Without knowing the initial moisture content, a drying time cannot be established that gives any certainty.
