Extrusion & Post
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LDPE Blown Film Frost Line Management
Fenómeno del problema
When the bubble frost line is too low, the film is hazy; when the frost line is too high, the bubble is unstable and film breakage is frequent.
Análisis de la causa
The frost line is the visualized position of bubble cooling and crystallization: too low a frost line means excessive cooling and film haze; too high a frost line means insufficient cooling and the bubble sways unstably; the balance of air ring air speed and volume determines the frost line.
Solución
①When the bubble is unstable, first reduce air ring air speed to raise the frost line; ②When the film is hazy, increase air speed to press down the frost line; ③Coordinate with internal cooling IBC adjustment; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
The frost line is the steering wheel of the blown film process; the balance between bubble stability and film transparency is all adjusted by it; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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