Craze
◆ possible causes related to process and equipment
- The barrel temperature is too high
- The screw speed is too fast
- The nozzle is too small, too hot, or blocked
- The glue injection volume exceeds 80% of the machine capacity
- There is gas or water vapor in the melt
- Incomplete cleaning
◆ possible causes related to the mold
- The gate is too small
- Gate or runner blockage
- There are micro cracks on the mold surface
◆ possible causes related to materials
- The material is not sufficiently dry
- Materials contain foreign matters
- High-temperature decomposition of materials
Surface peeling
◆ possible causes related to process and equipment
- The barrel temperature is too low
- The injection speed is too slow.
- Insufficient holding pressure (time)
◆ possible causes related to the mold
- Mold temperature is too low
- Gate or runner severely bent
- Improper gate type selection
- Too much release agent
◆ possible causes related to materials
- Poor drying of materials
- Too much material returned
- Incompatible additives
Black stripe
◆ possible causes related to process and equipment
- The firing speed is too fast
- The melt temperature is too high
- The injection pressure is too high
- The diameter of the nozzle is too small
- Nozzle temperature is too high
- High material pipe temperature
- The molding cycle is too long
- There are carbides in the material pipe
◆ possible causes related to the mold
- Improper gate type or position
- Gate diameter is too small
◆ possible causes related to materials
- The high-temperature stability of the material is not enough
- Materials contain foreign matters
Chromatic aberration
◆ raw material problems
- The selected colorants or other additives have poor thermal stability
- The selected colorant reacts and decomposes with resin or added additives
- The rheological property of raw materials is too low
◆ processing technology problems
- The drying time is too long or the drying temperature is too high
- The injection temperature or pressure is too high
- The retention time is too long, resulting in discoloration
- The injection molding machine is not clean and polluted
◆ surrounding environment and other influencing factors
- Raw materials or products should not be stored in direct sunlight
- The difference in the type of color difference meter or its insufficient color measurement accuracy
- Influence of product temperature during color difference measurement
Insufficient filling
◆ possible causes related to process and equipment
- Insufficient glue melt
- The barrel temperature is too low
- Poor back pressure setting
- Insufficient injection pressure (speed)
- Injection molding time is too short
- Large clearance of check valve
- Nozzle blockage
◆ possible causes related to the mold
- Mold temperature is too low
- Improper choice of gate type or position
- Poor mold exhaust
- The runner (gate) of the mold is too small
- Uneven distribution of mold cavity
◆ possible causes related to materials
- Poor liquidity of materials
- Poor drying of materials
Warping
◆ possible causes related to process and equipment
- Improper injection pressure or time
- The melting time in the feeding tube is too long
- Improper forming cycle
- The barrel temperature is too low
- Low nozzle temperature
- Improper holding pressure and time
◆ possible causes related to the mold
- Mold temperature is too high or too low
- The gate or runner is too small
- Improper gate type or position
- Uneven mold temperature
- The area of the ejector rod is too small or the distribution is unbalanced
- The wall thickness deviation is too large
◆ possible causes related to materials
- Improper liquidity
- Large deviation of longitudinal and transverse shrinkage of materials
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