Inthe production of plastic films, for example, roller heating is used to meltand shape the plastic material as it passes through a series of heated rollers.The temperature of each roller is carefully controlled to ensure that theplastic is heated evenly and to the correct temperature, which helps to createa uniform and consistent product. Industrial steam boilers are commonly used inroller heating applications because they can provide a reliable and efficientsource of heat for the rollers. The steam produced by the boiler can be used toheat the rollers directly or to heat a fluid, such as oil or water, which isthen circulated through the rollers to provide a consistent and eventemperature.