In developing control systems, FACTS monitors and controls various parameters in the extrusion process. Below is a starter list.
- Feed System
- blending ratios of multiple ingredients
- extruder throughput in lbs/hour or lbs/ft
- Extruder barrel temperature zones – These are usually have heating & cooling
- Tooling temperature zones – These are usually heat only
- Die temperature zones – These are usually heat only
- Speeds
- extruder screw
- roll stands
- pullers
- conveyors
- capstans
- wind-ups
- Tension - product tension is controlled by varying the appropriate speed(s) based on load cell or dancer feedback
- Melt Pump Inlet Pressure
- Product Dimensions
- OD (outside diameter)
- ID (inside diameter)
- Width
- Height
- Wall Thickness
- Roll Length
- Cut-to-Length
Parameters typically monitored in the extrusion:
- Drive Loads
- Melt Temperature
- Melt Pressure
- Tension
- Cut Counting
- Product Dimensions
Recommended additional parameters for monitoring to detect problems before any damage occurs, track for maintenance purposes, or assure proper process conditions:
- Gear Box Temperature, Pressure, and Lube Flow
- Motor Temperature
- Drive Faults
- Cooling Tank Temperature
- Relative Humidity and/or Dew Point – controlling cooling roll temperatures to just above the dew point can prevent corrosion and contamination of the product with moisture
- Moisture of Raw Material
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