Injection Molding
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Nozzle Blockage in High-Density Polyethylene '2079851475616104452
Sorun Belirtisi
During injection, the melt cannot be normally injected from the nozzle or the injection amount decreases, and the injection pressure abnormally rises.
Nozzle blockage causes short shot or complete inability to produce, and is usually caused by cold material or impurities blocking the nozzle hole.
Neden Analizi
(1) The nozzle temperature is too low, and the melt cools and solidifies at the nozzle
(2) The cold slug well of the mold sprue is designed improperly, and cold material flows back into the nozzle
(3) The raw material contains impurities that block the nozzle hole
(4) The nozzle hole diameter is too small or the internal structure of the nozzle is unreasonable
(5) The nozzle and the mold sprue are poorly aligned, and eccentricity produces flash and material sticking
Çözüm
(1) Increase the nozzle temperature to a reasonable value within the range of 180-260°C, 5-10°C lower than the front-section barrel temperature
(2) Check the cold slug well of the mold sprue to ensure the cold slug well size is sufficient
(3) Check the cleanliness of the raw material, and install a magnetic frame and filter screen on the hopper
(4) Select a nozzle with a suitable hole diameter; generally the nozzle hole diameter is 0.5-1mm smaller than the small end of the sprue
(5) Correct the alignment between the nozzle and the mold to ensure the coaxiality is within 0.05mm
Temel Çıkarım
Nozzle blockage is caused by cold material solidification or impurities, and needs to be solved from nozzle temperature, cold slug well design, and raw material cleanliness.
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