A 55mm extruder (often model SJ-55) is an industrial, single-screw machine designed for medium-scale production of LDPE/HDPE nylon films, typically for shopping bags or packaging, with an output of roughly \(50\)-\(60\text{kg/hr}\). It features a 55mm screw diameter, an \(18\text{kw}\) motor, and a screw speed of \(10\)-\(120\text{r/min}\). It includes intelligent temperature controls, a durable alloy screw, and often a double winder for continuous production.