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.
Flowlines vs. seagulls, hooks, heat marks Possible cause Corrective action Gate and runner design If marks are near the gate, locate and repair sharp edges and other
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