| unpleasant sight | Possible Causes | Approach |
| Finished product variant | Cooling time is too short, the finished product is not cooled enough | Extend cooling time |
| Open mold speed is too fast, strong pull variant | Slow down mold opening speed |
| Finished product structure is defective | Modify the mold |
| The mold temperature is too high and the finished product is not cooled. | Reduce the mold temperature |
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| Finished product is easy to break | Material temperature is too low or mold temperature is too low | Increase barrel temperature and mold temperature |
| Improper drafting or improper ejection | Modify the mold |
| The gate is too small | Modify the mold |
| Insufficient draft angle | Modify the mold |
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| The finished product has a grain after the mold is released. | The rate of fire is too fast, and the air in the cavity cannot be instantaneously discharged. | Reduce the rate of fire, so that the air in the cavity is smoothly discharged |
| Raw material contains water | Baking material |
| The molding temperature is too high, and the degranulation is decomposed by high temperature. | Reduce molding temperature |
| Air in the barrel | Reduce the temperature in the back of the tube and increase the pressure |
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| Finished product with burrs | Excessive pressure, the parting force is greater than the clamping force, and the mold is forced to open. | Reduce the pressure, fly the mold, increase the clamping force |
| Injection pressure and overpressure | Reduce the pressure and pressure |
| The shot is too fast, the material temperature is high | Reduce the rate of fire and material temperature |
| Mold vent clogging | Cleaning the mold |
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| Insufficient filling of products | Insufficient pressure, slow rate of fire or debris in the die | Increase injection pressure, increase firing rate and clean the die nozzle |
| The molding temperature is too low and the gate flow path is too small | Increase molding temperature and modify flow path |
| The air in the cavity cannot be completely discharged | Add or enlarge vents |
| Shooting time is too short, insufficient shot | Extend the injection time and increase the injection volume |
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| Products have a bonding line | Insufficient injection pressure, too fast, the gate and runner are too small
Another: the nozzle temperature is low, the molding cycle is long, the color masterbatch titanium dioxide is too much, and the color masterbatch is not well dispersed. | Improve injection pressure, rate of fire, and modify gate flow path |
| Molding temperature and mold temperature are too low | Increase molding temperature and mold temperature, increase back pressure or accelerate screw speed |
| Poor exhaust at the junction or no overflow tank (cold well) | Increase the vent hole or increase the overflow pool at the junction |
| Use too much release agent | Reduce the amount of release agent used |
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| Poor gloss of the product | The rate of fire is too slow, the injection pressure is too low, and the mold temperature is low. | Increase injection pressure, rate of fire, and mold temperature |
| Moisture or grease contamination in the cavity | Wipe clean |
| Poor surface grinding or too small gates and runners | Modify the mold |
| Insufficient injection volume or moisture in raw materials | Increase jet fire rate, extend injection time and baking material |
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| Flow on the surface of the product | The injection pressure is too high or too low, the rate of fire is too fast or too slow | Adjust the appropriate injection pressure or rate of fire |
| The holding time is too short or the gate is too small | Increase the holding time or change the gate |
| Mold temperature and gate temperature are too low | Improve mold and gate temperature |
| Poor material melting | Increase temperature, back pressure or speed up the screw |
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| Extrusion finished surface rough | Low molding temperature | Increase temperature, back pressure and screw speed |
| Mode temperature is too low | Increase mold temperature |
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| The surface of the product is blocky | The tube is not cleaned or has debris | Reclean the tube |
| Additives such as color masterbatch or carrier are not required | Find the corresponding color masterbatch |
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| After the product is molded, it will be swollen. | The die temperature is too low, or the screw speed is too fast | Increase die temperature and reduce screw speed |
| Limit too fast | Adjusting the limiter |
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| Produces a large amount of gas during extrusion | Overall temperature is too high | Reduce the temperature |
| There is debris in the material tube | Cleaning the tube |
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| The product has shrinkage | Raw materials contain water | Baking material |
| The melt temperature is too high and the screw speed is too fast | Reduce temperature and reduce screw speed |
