What’s the difference between the plastic recycling series of CK-SF, CK-SFD, CK-SC, and CK-HSD?

The CK-SF and CK-SFD both contain a side force feeder, they are suitable for recycling fluffy plastic crushed film, flakes, or foam materials. The CK-SFD has double extruder design, which can process dirty plastic wastes. As to the CK-SC series, the side shredder can handle clean or washed plastic crushed films, yarns, jumbo bags, etc. The last one CK-HSD series is also designed with double extruders, however, it is suitable for processing dirty plastic flakes.