Injection Molding
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PA6 '2079851475616104452 Melt Temperature Too High
Problem Phenomenon
The measured melt temperature exceeded the setting, and products turned yellow.
Cause Analysis
Shear heat (high speed/back pressure); the actual melt temperature is far higher than the set value; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; during troubleshooting, confirm item by item around key factors such as melt temperature and shear heat to avoid misjudgment.
Solution
①Reduce screw speed and back pressure to reduce shear heat generation;②use temperature measurement means to actually measure the melt temperature and calibrate the process setting;③check whether the screw compression ratio is suitable for the material;④optimize the combination of screw speed and back pressure, taking into account both plasticization and shear heat;⑤include the actual melt temperature in process monitoring to detect abnormalities in time.
Key Takeaway
PA6 melt temperature = 'setting + shear heat': actual measurement is the truth; nylon shear heat is obvious, and the actual melt temperature must be included in monitoring; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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