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Problem
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Possible Cause
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Possible Solution
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Chatter
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Calibrator misalignment in tank
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adjust calibrator
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Vacuum too high (therefore to much drag in calibrator)
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Decrease vacuum
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Surging
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Improper extruder melt profile
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Modify profile to achieve steady head pressure and motor amperage
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Loss of feed
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Feed section temperatures too high causing premature melting
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Reduce feed section temperatures and increase feed throat cooling rate
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High head pressure & reduced extrusion rate
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Screen pack plugged
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Change filtering elements
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Bubbles/Holes
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Resin too wet
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Change resin supply to new unopened container
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Pre-drying of material
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Gels/Fish eyes
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resin processing temperature too low
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Increase extruder barrel temperatures
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Black Specks
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Carbonized resin or contaminants from previous runs
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Change resin supply / clean system
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