For maximum effect, LFD is usually combined with a deep vacuum system and a condenser / moisture trap to continuously remove evaporated water and keep vacuum stable. A controlled heating and temperature monitoring set (winding thermocouples, tank/active-part sensors) is essential to prevent overheating and to keep the drying front moving uniformly. It also helps to add hot oil circulation or a separate oil purification unit after drying, because once the active part is dry, the oil must be treated or replaced to avoid re-wetting the paper. Finally, a dry-air or nitrogen backfill system is recommended for the end of the process to break vacuum safely and prevent moisture ingress during cooling and refilling.