Abstract: Experiments were made on a platform with hydraulicclamshell type barrels to study the relationship between the melting length and screw rotate speed. Channelgroove coupling melting model for single screw extruders with grooved barrel was confirmed.Compared with conventional and IKV single screw extruders, it was found that the melting lengths in the single screw extruder with a grooved melting zone were shorter and more stable and melting efficiency could be improved greatly.

Key words: grooved barrel, melting length, clamshell type barrel, single screw extruder