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Common Processing Problems

  • Extremely corrosive
  • Very heat sensitive

Screw & Barrel Construction Considerations

  • Bimetal barrels reduce corrosion
  • Hard-faced flights/triple industrial chromeplated roots or stainless screws protect from pitting
  • Never consider tool steels

Screw & Barrel Design Considerations

  • Long, gradual transistion areas prevent burning and degradation
  • Compression ratio: 2.2:1
  • Flight profile: 35% Feed/50% Transistion/15% Metering
  • Keep residency time to a minimum
  • Stainless steel smear tips prevent burning

Common Processing Problems

  • Extremely heat sensitive

Screw & Barrel Construction Considerations

  • Tool steel on screws and barrels ‹ 1-1/2" dia.
  • Screws ‹ 1-1/2" dia. use 4140HT steel with hard-faced flights and chrome plated roots
  • Barrels ‹ 1-1/2" dia. should have bimetal lining

Screw & Barrel Design Considerations

  • Consider downsizing to reduce residency time & increase injection pressure
  • Long, gradual transistion areas prevent burning and degradation
  • Compression ratio: 2.2:1
  • Flight profile: 25% Feed/55% Transistion/20% Metering
  • Check ring valve assemblies with free-flow design are recommended

Common Processing Problems

  • High viscosity

Screw & Barrel Construction Considerations

  • Tool steel on screws and barrels ‹ 1-1/2" dia.
  • Screws ‹ 1-1/2" dia. use 4140HT steel with hard-faced flights and chrome plated roots
  • Barrels ‹ 1-1/2" dia. should have bimetal lining

Screw & Barrel Design Considerations

  • Longfeed allows glass fibers to soften before compression to help prevent burning and degradation
  • Compression ratio: 3:1 (high viscosity) and 5:1 (low viscosity)
  • Flight profile: 505% Feed/25% Transistion/25% Metering
  • Ring type or ballcheck nonreturn valves can be used for processing

Common Processing Problems

  • Heat sensitive

Screw & Barrel Construction Considerations

  • Tool steel on screws and barrels ‹ 1-1/2" dia.
  • Screws ‹ 1-1/2" dia. use 4140HT steel with hard-faced flights abd chrome plated roots
  • Barrels ‹ 1-1/2" dia. should have bimetal lining

Screw & Barrel Design Considerations

  • Compression ratio: between 2:1 and 2.5:1
  • Flight profile: 25% Feed/55% Transistion/20% Metering
  • Check ring valve assemblies with free-flow design are recommended

Common Processing Problems

  • Heat sensitive

Screw & Barrel Construction Considerations

  • Tool steel on screws and barrels ‹ 1-1/2" dia.
  • Screws ‹ 1-1/2" dia. use 4140HT steel with hard-faced flights abd chrome plated roots
  • Barrels ‹ 1-1/2" dia. should have bimetal lining

Screw & Barrel Design Considerations

  • Compression ratio: between 2:1 and 2.5:1
  • Flight profile: 25% Feed/55% Transistion/20% Metering
  • Check ring valve assemblies with free-flow design are recommended