The vacuum dryer is the most advanced equipment in the world, which is designed specifically for soaps with different fatty acid content in the oil production line. Its working principle is to use the principle of lowering the boiling point of water under vacuum, so that the soap base evaporates the water in it at low temperature to achieve the purpose of cooling and hardening, and it is extruded into soap nuggets (semi-finished products) by the soap noodle machine.