Injection Molding
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ASA injection speed and shear
Fenómeno del problema
[Problem phenomenon] ASA injection speed improper, jetting marks and short shots appear alternately
Análisis de la causa
ASA medium viscosity medium shear sensitivity, injection speed medium-high is appropriate: too slow causes front freezing and short shots, too fast causes shear heat generation and discoloration; long runner thin wall needs 200mm/s level high speed
Solución
Injection speed set at medium-high and staged; long runners use high speed with venting; reduce speed and check gate when discoloration or jetting occurs; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
ASA injection medium-high speed is appropriate, long runner 200mm/s level with venting; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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