The effect of PVC drying temperature on resin quality
Thread Content
In the suspension-based PVC production process, the devices used for drying the PVC slurry include internal heat-type fluidized beds, external heat-type fluidized beds (which have been almost entirely phased out), cyclone dryers, and swirl dryers. Among these, the external heat-type fluidized bed and cyclone dryer belong to the category of low-temperature drying methods, while the internal heat-type fluidized bed belongs to the category of high-temperature drying methods. PVC is a thermosensitive material that is highly sensitive to temperature; so what impact do these two drying methods have on the quality of the resin? Especially the impact of the resin’s whiteness and thermal stability parameters?
Both cyclone drying and swirl drying processes have little impact on the quality of the resin; it’s mainly a matter of matching the scale
The product quality of the cyclone dryer bed is not as stable as that of a fluidized bed with an internal heater. The air ducts and other components associated with the cyclone bed need to be cleaned regularly; otherwise, it will affect the impurity particles.