Solutions to Defects of Extruded Products
29-08-2025
Solutions to Defects of Extruded Products
| Solutions to Defects of Extruded Products | ||
| Product Defects | Causes | Solutions |
| Distortion | The cooling time is too short and there isn't enough cooling to complete one cycle. | Delay the cooling time. |
| The extrusion speed is too fast and the material is deformed by forced movement. | Slow down the speed of the extruder mold. | |
| There are defective finished products. | Repair the mold. | |
| The mold temperature is too high, resulting in poor cooling of the material. | Lower the mold temperature. | |
| Knit Lines | Insufficient injection pressure, too slow injection speed, and the gate and runner are too small. | Increase the injection pressure and speed, and modify the gate and runner. |
| The molding temperature and mold temperature are too low. | Increase the temperature and back pressure or the screw rotation speed. | |
| Insufficient gas inflow, resulting in weld lines. | Fix the air vents in the flow area and increase the number of weld line outlets. | |
| Using too much release agent. | Reduce the use of release agent. | |
| Gloss | Too slow injection speed, insufficient pressure, and low mold temperature. | Increase the injection speed, injection pressure and mold temperature. |
| Water or oil stains in the mold cavity. | Clean it thoroughly. | |
| Poor mold surface finish or too small gate and runner. | Modify the mold. | |
| Insufficient injection volume or water contained in the raw material. | Increase the injection pressure and injection speed, and delay the injection. | |
| Cracks in Finished Products | The temperature of the material or mold is too low. | Increase the mold temperature. |
| Insufficient stripping oil or improper stripping method. | Modify the mold. | |
| The gate is too small. | Modify the mold. | |
| Insufficient stripping angle. | Modify the mold. | |
| Surface Blocks of Extrusion | The molding temperature is too low. | Increase the temperature and speed up the screw rotation speed. |
| The mold temperature is too low. | Increase the mold temperature. | |
| Discoloration of Extrusion | The material pipe is not cleaned and contains waste. | Clean the material pipe. |
| The color masterbatch or additives do not meet the requirements. | Use the corresponding color masterbatch. | |
| Swelling of Extrusion | The die head temperature is too low or the screw rotation speed is too fast. | Increase the die head temperature and reduce the screw rotation speed. |
| Sink Marks of Extrusion | Too fast material feeding. | Adjust the material feeding device. |
| Water contained in the raw material. | Dry the material. | |
| The measuring temperature is too high and the screw rotation speed is too fast. | Lower the measuring temperature and reduce the screw rotation speed. | |