Transcription of PPD-407B Injection Molding Troubleshooting …
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PPD-407B Injection Molding Troubleshooting …
Injection moldingTroubleshooting guideEastman copolyestersBlack specks .. 3 Brittleness .. 3 Discoloration .. 4 Flashing .. 4 Flash and short shot in different shots .. 5 Flash and short shot in the same shot .. 5 Flowlines vs . seagulls, hooks, heat marks .. 6 Gate blush ..07 Haziness ..07 Hot runners, hot sprues, valve gates .. 08 Jetting .. 08 Sinks and voids .. 08 Splay ..09 Air splay and decompression splay .. 09 Contamination splay .. 09 Heat splay .. 10 Moisture splay ..10 Shear splay .. 11 Other splay .. 11 Sprue sticking ..12 Unmelts .. 12 Warped or distorted parts as ejected from the mold ..13 Warped parts after packing/shipping ..13 Wavy appearance .. 14 Weld line defects ..14 ContentsPossible causeCorrective actionPrevious material(s) in the screw, check ring, hot runner, etc .Purge machine with Eastman copolyesters or commercial purge compounds.
Gate blush Haziness Possible cause Corrective action Fast injection speed Use slower injection speed, especially at beginning of the shot . Gate design
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