Producers of nonwoven battings and foams are faced with unique drying challenges due to the insulative characteristics of these products. When drying by conventional methods, longer residence times are required to allow the heat to penetrate into the inner portion of the products and remove moisture. The radio frequency drying system simultaneously heats these products throughout their entire thickness and removes the moisture by converting it to a gas in situ. This reduces drying times, increases the energy efficiency of the drying process, and eliminates the carbon dioxide emissions associated with other drying methods. Because the moisture is turned to gas in situ, the migration of suspended solids such as binders, anti-microbial agents or colors is eliminated. This prevents the formation of a surface crust and enhances the uniformity, performance and hand feel of the product. The radio frequency drying process is a relatively low temperature process — generally not exceeding 212°F (100°C) — making it suited for temperature-sensitive materials.
Radio Frequency Co. Inc.