Scorch
◆ possible causes related to process and equipment
- The rate of fire (pressure) is too high
- The melt temperature is too high
- The back pressure is too high
- The diameter of the nozzle is too small
- Nozzle temperature is too high
- High material pipe temperature
- The screw speed is too fast
◆ possible causes related to the mold
- Improper gate type or position
- Gate diameter is too small
- Poor mold exhaust
◆ possible causes related to materials
- The material is not heat-resistant enough
- Too many secondary materials
- The high-temperature stability of the material is not enough
Low Gloss
◆ possible causes related to process and equipment
- The barrel temperature is too low
- Insufficient injection pressure
- Low nozzle temperature
- The melting time in the feeding tube is too long
- Improper forming cycle
◆ possible causes related to the mold
- Poor mold finish.
- The gate or runner is too small
- Improper gate type or position
- Poor exhaust
- There are foreign matters on the surface of the mold.
◆ possible causes related to materials
- The material is not sufficiently dry
- Improper flow performance
- Poor gloss of the material
Flash
◆ possible causes related to process and equipment
- The injection pressure (speed) is too high
- The glue stays in the material pipe for too long
- The molding cycle is too long
- Insufficient clamping force
- The material temperature is too high
◆ possible causes related to the mold
- Poor contact of clamping surface
- Insufficient mold strength
- Poor exhaust
- The sprue is too long
- The size of mold accessories is not precise
◆ possible causes related to materials
- Liquidity is too good
- Too much lubricant
Sunken
◆ possible causes related to process and equipment
- The barrel or mold temperature is too high
- The injection pressure, speed, and back pressure are too low, and the injection time is too short
- Insufficient holding pressure (time)
- Poor cooling time setting
- The check valve is poor
◆ possible causes related to the mold
- The gate or runner is too small
- Gate position or type selection is poor
- The gate solidifies too early
- The reinforcement is too thick
- Flow imbalance
◆ possible causes related to materials
- The fluidity and shrinkage of materials are unqualified
- Excessive amount of returned materials
Flow mark
◆ possible causes related to process and equipment
- The barrel temperature is too low
- The injection pressure is too low
- Insufficient holding pressure (time)
- Improper cycle time
- The glue stays in the feeding tube too long
◆ possible causes related to the mold
- Mold temperature is too low
- The gate or runner is too small
- Poor exhaust
◆ possible causes related to materials
- Material fluidity does not meet the requirements
- Improper lubricant
- Too many volatile substances
Crackle
◆ possible causes related to process and equipment
- Excessive filling, pressure maintaining, and excessive residual stress
- The pressure of maintaining time is too long
- Mold temperature is too low
◆ possible causes related to the mold
- Insufficient demoulding slope
- Poor ejection
- Too much release agent
◆ possible causes related to materials
- Poor drying
- Too much secondary material
- High-temperature decomposition of materials
Black dot
◆ causes of bad black spots
- The injection molding machine is not cleaned thoroughly
- The temperature of the injection molding machine is set too high
- The structure of the injection nozzle of the injection molding machine is unreasonable
- The retention time is too long, which is easy to scorch and produce black spots
- The drying bucket is not cleaned thoroughly
- The air blowing (suction) device of the drying bucket is polluted by the filter screen
- The storage barrel is not cleaned thoroughly
- Improper management of handling, unpacking, and feeding process, which is easy to bring dust and other impurities into the surrounding environment
- The black spots of the product itself should be fed back in time for the convenience of investigation
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