A：Decolorization is one of the important steps of edible oil refining. Too long or too short decolorization time will affect the effect of refined oil refining. Therefore, it needs to be a balance between time and effect.

A：Tips for setting up a vegetable oil refining production line include assess market and oil type, choose the right vegetable oil refining equipment, establish energy efficiency and waste management systems, establish a quality control system, etc.

A：The key considerations for setting up a vegetable oil refinery plant includes: market demand and research, choosing the right location, plant capacity and machinery requirements, raw material sourcing and storage, compliance and certification etc.

A：The difference among three types of cooking oil refining machines is mainly reflected in the following aspects: processing capacity, degrees of automation, investment cost, product quality stability and degrees of energy loss.