Extruded pipe often appear defects and improve the reasons
Extruded pipe often appear defects and improve the reasons | ||
Abnormal phenomenon | The reasons causing | The solution |
Surface without shiny | ①die temperature is too low ②die wall does not dryor ③net compressed air supply is insufficient or leakage | ①appropriate to improve the temperature ②clean up the die ③increase the gas supply or check the leak and repair |
Thickness is not uniform | ①core mold and die position is not correct ②plasticizing uneven ③traction is not normal ④compressed air instability ⑤diehead temperature instability | ①should adjust the core mold and die center position ②check the traction device ③should be a smooth supply system ④strengthen the control of the plasticizing system ⑤check the head section heating device is intact, and the nose temperature stability |
Surface has the black lines | ①the raw material additive is unevenly dispersed ②raw material poor liquidity ③head section and filter temperature too high ④head section filter and shunt version of the poor structure ⑤the filter is not clean | ①improve the mixing, strengthen the mixing to improve the dispersion performance ②to improve the raw material formula ③appropriate to reduce the temperature ④check the filter and shunt plate ⑤clean up the filter |
Surface wrinkles and ripples | ①die temperature is too high or uneven heating ②cooling stereotypes lack of water supply, the water temperature is higher ③traction speed is too slow ④die output is not uniform | ①check the heating device is damaged, reduce the temperature appropriate ② increase the water supply ③speed up the traction ④ adjust the die gap |
Inner wall crack | ①raw material mixed with impurities ②core mold temperature is low ③low cylinder temperature ④traction too fast ⑤too much lubricant | ①to pretreatment of raw materials ②increase the core mold temperature ③ improve the cylinder temperature ④slow down the traction speed ⑤ adjust the formula |
