Injection Molding
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Metering Fluctuation of PE Injection Molded Products
Fenómeno do problema
Plasticizing time and cushion fluctuate, the unit weight of products is unstable, and short shots and flash alternate.
Análise das causas
Unstable hopper feeding (bridging, film material/powder mixing in causing conveying efficiency to go up and down), check ring wear and leakage causing melt backflow during injection, and back pressure setting fluctuation — all three make the actual shot amount inconsistent from shot to shot, ultimately manifesting as plasticizing time and cushion being alternately large and small.
Solução
①Stabilize feeding and control regrind shape and proportion; ②Monitor cushion fluctuation; ③Disassemble and inspect the check ring; ④Stabilize back pressure and screw speed; ⑤Switch to a screw suitable for PE if necessary.
Conclusão principal
For PE metering fluctuation, first check the two mechanical links of feeding and the check ring: cushion fluctuation is the most intuitive alarm and should be continuously monitored; metering stability is the prerequisite for all quality in PE '2079851475616104452 — if metering cannot be stabilized, any process parameter adjustment is empty talk.
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