Uniformly drying a non-uniform product is difficult. Decreasing the drying time of heat-sensitive products is challenging. One example is a three-dimensional product saturated with water — for instance, molded-fiber packaging products. Other examples of demanding drying applications include:
Lightweight, nonwoven fabrics vary in thickness and basis weight after being formed. Uniformly drying a saturated finish without overheating the lightweight areas of the fabric is difficult. Drying lumber takes forever and a day. Actually, it requires many days, and aggressive attempts to reduce the drying time can result in boards splitting or cracking. Effectively drying pressure-sensitive adhesives presents a host of issues for web converters like label manufacturers.