INJECTION MOLDING ENCYCLOPEDIA
Injection Molding Encyclopedia
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84 articles
LCP connector stringing: Is it caused by high melt or mold temperature?
For incomplete LCP connector stringing removal, distinguish between high melt and mold temperatures: LCP E130i melting point 335°C, hot runner 335–345°C, mold temp 80–120°C, with extremely fast solidification. This article outlines the troubleshooting sequence: inspecting string shape, measuring nozzle tip temperature, checking gate shear, and adjusting opening speed, plus cases where lowering mold temperature is ineffective.
PPS drooling: Material seeps after ten minutes of stoppage. How to maintain 150°C mold temperature?
PPS material seeps after ten minutes of stoppage at 150°C mold temperature because the material remains fluid at the nozzle tip. 1140A1 (40%GF) nozzle 310–320°C, melt temp not exceeding 360°C. This article explains how long to wait before cleaning, sealing methods, and which parameters cannot be substituted.
PPS stringing: Why does stringing persist even after raising mold temperature to 150°C?
PPS mold temperature is 150°C, leaving limited room for increase, yet stringing persists, indicating a wrong approach. DURAFIDE 1140A1 (40%GF) nozzle 310–320°C, melt temp must not exceed 360°C. This article discusses what to adjust once mold temperature reaches its limit and why PPS strings represent 'failure to break'.
PA9T nozzle clogging: How to distinguish between material blockage and enlarged gates?
PA9T nozzle clogging falls into two categories: material freezing in the channel or abnormal filling due to gate enlargement from glass fiber wear. G1350A contains 35% glass fiber, with different manifestations for wear versus freezing. This article provides the disassembly inspection sequence, judgment criteria, and respective solutions.
PA9T drooling: Why does material ooze shortly after stopping feed?
PA9T has a Tg of 125°C; during stoppage, the nozzle tip cools slowly, allowing soft material to seep out. G1350A (35%GF) melting point 300°C, water absorption 0.19%. This article covers the relationship between residual heat and exit temperature, control of stoppage duration, and differences from PA46 drooling.
Is PA9T stringing caused by moisture absorption or shear heating diluting the material?
PA9T stringing is often misdiagnosed as moisture-related. Genestar G1350A (35%GF) has a water absorption rate of only 0.19%; drying is merely a prerequisite. The real driver is gate shear heat lowering melt viscosity. This article outlines the sequence: check moisture content, inspect gates, reduce injection speed, and explains why extending drying time is ineffective.
Why does PA46 clog within one or two shots? What if it drops below the window lower limit?
PA46 nozzles often clog within one or two shots because TS250F6D has a melting point of 295°C and a narrow melt window; material crystallizes rapidly if melt temperature drops below 305°C. This article discusses judging the window lower limit, the sequence for reheating melt and nozzle tips, and prohibited actions during channel cleaning.
PA46 drooling: Why does it occur mainly after stoppage and color changes?
PA46 drooling concentrates in the first few shots after stoppage, color change, or purging. TS250F6D melting point 295°C, melt must remain above 305°C; prolonged residence at the nozzle tip reduces viscosity, causing free flow. This article covers timing, melt temperature windows, stoppage procedures, and color change sequences.
Why Must Camera Module Bracket Tolerances Be Tightened to 0.02mm?
0.02mm is one-third of a hair width; step height deviation affects focus. LCP has extremely low water absorption and shrinkage of 0.10%/0.40%. Critical dimension orientation must align with flow direction. Mold machining precision 0.005mm; 3°C mold temp fluctuation causes 0.01mm error. Inspection requires vision systems and constant-temp rooms; acceptance includes positional accuracy after assembly.
Can PPS Withstand 800V in E-Drive Power Components?
At 800V, electric field strength doubles, making creepage distance and tracking resistance critical. PPS is halogen-free, flame-retardant, and has good tracking resistance. For DURAFIDE 1140A1 (40% GF), nozzle temp is 310–320°C and mold temp is 150°C. Shrinkage is 0.3%/0.8%; uniform mold temperature determines hole positioning. Plastic layer around inserts must be ≥1.5mm, and inserts require preheating.
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