The two-stage compounding extrusion pelletising unit achieves refined and specialised process division by separating the core functions of 'compounding' and 'extrusion' into two distinct equipment units. By simply connecting these two units in series and employing meticulously matched process parameters and structural configurations, it creates a synergistic effect. This enables the entire system to operate under optimised processing conditions for each stage, comprehensively enhancing both production efficiency and product quality.

Components

The first stage comprises the 'compounding mechanism', while the second stage consists of the 'extrusion mechanism'. These two sections are typically arranged in a 'vertical orthogonal configuration', whereby the first-stage compounder is positioned above and the second-stage extruder below. They are interconnected via a dedicated transition assembly, forming a compact integrated system.

Reference diagram of PVC two-stage mixing unit model

SDJ	Type	inner diameter of barrel D(mm)	Draw ratio L/D	Main motor power (KW)	Screw speed (rpm)	Reference yield (kg/h)
65/150	double screw	62	28-48	55-90	400-600	300-600
65/150	single screw	150	7-20	37-45	65	300-600
75/180	double screw	72	28-48	90-160	400-600	600-1200
75/180	single screw	180	7-20	55-90	65	600-1200
85/200	double screw	82	28-48	200-315	400-600	1200-2000
85/200	single screw	200	7-20	110-160	65	1200-2000
95/250	double screw	92	28-48	350-450	400-500	2000-3000
95/250	single screw	250	7-20	132-185	65	2000-3000
115/300	double screw	116.5	28-48	700	400-500	3000-4000
115/300	single screw	300	7-20	185-250	65	3000-4000