The blending of materials prior to drying can change the dynamics of your drying task. Consider these elements:
- Virgin material, blended with a high percentage of regrind (which is typically much lighter than virgin material) decreases the combined bulk density of the material to be dried. In some cases, this may require a larger drying hopper in order to provide enough residence time for the drying process.
- Materials mixed by dry blending (not compounded) may separate during transfer from the blending device to the drying hopper, resulting in uneven drying and worse, uneven or error-filled processing, IE: off color parts or parts lacking the characteristics to be created by the additive.
- You should not mix or blend materials with very different drying requirements. You should dry those materials separately before blending and processing.