A fixed die head produces thickness variation that repeatedly lands on the same angular position of the film roll, creating hard ridges (sometimes called "gauge bands"). These make rolls difficult to wind tightly and cause problems in downstream printing or lamination. A 360° rotary die head continuously rotates so any thickness variation is spread evenly across the entire roll, producing a far more uniform product. This is essential for high-specification packaging film destined for printing or lamination lines.

The standard configuration processes LDPE (Low Density Polyethylene), HDPE (High Density Polyethylene), and LLDPE (Linear Low Density Polyethylene). The screw and die head geometry are optimized for polyethylene resins. For LLDPE, a longer L/D ratio screw (30:1 or higher) is recommended to ensure complete homogenization. Processing other resins such as PP or biodegradable PLA requires a different screw profile and die head configuration — please consult our engineering team for those applications.

Depending on model, film thickness ranges from 0.008 mm (8 microns) up to 0.15 mm (150 microns). Thinner gauges (under 0.015 mm) require stable bubble conditions and are best suited to the LDPE/LLDPE material combination. Film for lamination is commonly produced at 0.020–0.050 mm, while heavy-duty industrial bags typically run 0.060–0.120 mm.

Variable-frequency drives control the rotation speed of both the main extruder motor and the traction (haul-off) motor. This allows precise, stepless adjustment of output rate and draw ratio independently. VFD control also enables soft-start ramp-up, eliminating mechanical shock at startup, and reduces peak power draw by up to 30% compared to direct-on-line motor starting. The result is longer mechanical service life, lower electricity bills, and finer control over film properties.

Yes. Our engineering team can arrange on-site installation and operator training at your facility. This covers machine commissioning, screw and die head setup, process parameter guidance, and basic maintenance procedures. Travel, accommodation, and engineering fee apply — please contact us for a quotation based on your location and scope of work required.

The double rewinder features two independent winding stations, each driven by a torque motor that maintains consistent web tension regardless of roll diameter. When one roll reaches its set length or diameter, the operator can switch to the second station while the finished roll is changed — minimizing production stoppages. Torque-motor winding (as opposed to friction winding) is critical for producing tight, telescoping-free rolls across a wide range of film widths and gauges.