GFxl Groove Feed Extrusion Screw
Groove Feed Accelerator
High Performance Groove Feed Extrusion
The SpiraMelt GFxl Screw offers exceptional output while maintaining a high quality isothermal melt. Groove feed screw designs are typically capable of achieving significantly higher output at lower melt temperatures than conventional smooth bore designs. However, due to exceedingly high pressure generation and melt quality concerns associated with high output, groove feed screw designs must be optimized for production. The SpiraMelt GFxl Screw includes unique channel geometry and a series of dispersive and distributive mixing elements to achieve exceptional output while maintaining a high quality isothermal melt.
High Output, High Melt Quality
The SpiraMelt GFxl Screw incorporates a series of dispersive and distributive mixing elements to promote a high quality isothermal melt. The GFxl Screw first introduces a barrier member that breaks up agglomerates that escaped the groove feed throat. Agglomerates and un-melt must shear over the undercut barrier flight, elongating the particles and exposing more surface area to the adjacent polymer and barrel wall for heat transfer. The the cross channel barrier member, no un-melt can pass through this mixing section. As the resin travels downstream, the GFxl Screw introduces a series of mixing elements that provides highly effective mixing with cut-through melt channels for chaotic mixing and undercut flights for uniform shear history. When compared to conventional groove feed screw designs, the GFxl Screw continually outperforms.
Maximize Output
The SpiraMelt GFxl Screw generates exceptionally high output while maintaining high melt quality.
Melt Quality
The SpiraMelt GFxl Screw improves overall throughput while supplying a high quality isothermal melt. Lower melt temperatures at higher outputs can be achieved on vented extrusion applications!
Features and Benefits
- Exceptional output and melt quality when compared to smooth bore extruders under similar operating conditions. High pressure, output, and quality are achieved at lower melt temperatures.
- Capable of very high pressure development within the groove feed section. This makes the GFxl less sensitive to die pressure when compared to smooth bore extruders that must increase rpm to maintain high output against high head pressure.
- Superior part quality at lower melt temperatures. With a unique series of dispersive and distributive mixing elements, the GFxl Screw not only offers exceptional output, but also high melt quality and stability.
Excellent performance with most high viscosity polyolefins and lower melt temperature resins with lower degrees of crystallinity. PE and PP are commonly processed on pipe, sheet, and blown film applications with great success.
Softer resins and high melt temperature resins are typically not recommended with groove feed operation. There is a loss of efficiency in feeding these resins due to temperature and friction limitations in groove feed barrels.