High Viscosity Extrusion

Processing Considerations for High Viscosity Extrusion

Recommended Processing Considerations: High Viscosity Extrusion

Residence Time: Screw should not be left idle for more than 3-4 minutes with melt in the barrel. Excess residence will be visible as black carbon specs in the melt.

Regrind Level: Typically, up to 25% is recommended but higher levels are possible with little or no effect on flow and finish.

Drying Temperature: Although Nylene resins are packaged and delivered in a low moisture state, it is good material handling practice to use a hopper dryer to maintain dryness. Should pre-drying be necessary, use settings of 180 °F (82.2°C) air at dew point of -40 at a rate of 1 cu. ft. / hour per pound of resin and a residence time of 2-4 hours.

Cooling and Sizing: While both air and water can be used as the cooling medium, air is preferred. The use of air allows additional time for sizing and reduces residual stress. This aids in reducing warpage, especially in profiles with varying wall sections. If water is used, heat the first section to above 100 °F (38°C) to reduce quenching and residual stress.

Die Design: Draw down of 30% is typical for all dimensions except wall thickness.

Land length: should be around 10x wall thickness.

Products

ProductReinforcement/AdditivesFeaturesResin Type
Nylene 615SA
  • Abrasion resistance
  • Good shape retention
  • Grease resistance
  • High viscosity
  • Low oxygen permeability
  • Toughness
  • Nylon 6
Nylene 615SA N
  • Abrasion resistance
  • Excellent melt stability
  • Good shape retention
  • Grease resistance
  • Low oxygen permeability
  • Toughness
  • Nylon 6
Nylene NX3064N
  • Excellent melt stability
  • Excellent melt strength
  • Higher viscosity
  • Nylon 6
Nylene 764B
  • Unfilled
  • Impact Modified
  • Excellent impact strength
  • Heat resistance
  • Nylon 6
Nylene 615-130HSU
  • Excellent flexibility
  • Good abrasion resistance
  • Heat stabilized
  • High strength
  • Improved stiffness
  • Improved strength
  • Nylon 6
Nylene 607
  • Lubricated
  • Excellent durability
  • Excellent properties
  • Excellent structural strength
  • Good draw-down
  • Good melt strength
  • Nylon 6
Nylene 609
  • Excellent melt flow
  • Good melt strength
  • High RV
  • Single layer nylon system
  • Nylon 6
Nylene CP41321U
  • Chemical resistance
  • Good clarity
  • Good flexibility
  • Good strength
  • High elongation
  • Lower processing temperatures
  • Toughness
  • Nylon 6/69
Nylene 608
  • Excellent melt flow
  • Good melt strength
  • Single layer nylon system
  • Nylon 6
Nylene 2407 HSSP
  • Unfilled
  • Heat resistance
  • High impact resistance
  • High viscosity
  • Low cost
  • Superior flexibility
  • Used for other extrusions and molded parts
  • Very good physical properties
  • Nylon 6
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