Molding Process
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Material Buildup on the Sizing Sleeve of HDPE Pipe
Fenómeno do problema
Material builds up at the sizing sleeve inlet of HDPE pipe, and the pipe surface is scratched and shows score marks.
Análise das causas
Volatiles or low-molecular substances in the melt condense and precipitate in the low-temperature zone at the sizing sleeve inlet, gradually building up into scale; the higher the melt temperature, the more violent the volatilization, and the precipitates continuously adhere to and scrape the pipe surface as the pipe advances, eventually forming periodic score marks and scratches.
Solução
①Regularly clean the sizing sleeve; ②Appropriately lower the melt temperature to reduce volatilization; ③Check raw material quality and regrind proportion; ④Polish the sizing sleeve inlet; ⑤Optimize the lubrication system to reduce precipitation.
Conclusão principal
HDPE sizing sleeve buildup = 'volatilization and condensation': lower the temperature, clean frequently, and control raw material — three measures at once; buildup scratching is gradual, so regular maintenance is more economical than after-the-fact handling.
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