01. Lack of material
1. Lack of material: the product is incomplete, and some are not filled
2. Solution:
>> Increase the injection pressure and speed
>> Increase the temperature of the barrel and the mold
>> Check whether the gate and flow channel are blocked, clean or optimize the design
02. Flinging edge (burr edge)
1. Flinging edge (burr): excess plastic spillage occurs in parts such as the parting surface of the mold
2. Solution:
>> Reduce the injection pressure and speed.
>> Check whether the parting surface of the die is cooperated well for dressing
Adjust the clamping force
03. Shrinkage
1. Shrinkage: the surface of the product is partially sunk
2. Solution:
>> Increase the holding time and pressure
>> Increase the cylinder temperature appropriately
>> Optimize product design to make the wall thickness uniform
04. Bubbles
1. Bubble: There is a hole inside
2. Solution:
>> Fully dry plastic raw materials
>> Reduce screw speed and increase back pressure
>> Optimize mold exhaust system
05. Weld marks
1. Weld mark: the mark formed when two or more strands of melt converge
2. Solution:
>> Adjust gate position and number
>> Increase injection temperature and speed
>> Improve mold temperature distribution
06. Silver silk
1. Silver silk: silver stripes appear on the surface of the product
2. Solution:
>> Dry raw materials thoroughly
>> Clean the barrel
>> Reduce screw speed and back pressure
07. Warping deformation
1. Warping deformation: product shape distortion, bending and other changes
2. Solution:
>> Uniform cooling mold, optimize cooling water design
>> Adjust injection molding process parameters
>> Improve product structure design
08. Surface scratches
1. Surface scratches: Scratches appear on the surface
2. Solution:
>> Check whether the mold surface is smooth
>> Pay attention to demoulding operation to avoid collision with hard objects
09. Size deviation
1. Size deviation: the actual size does not match the design size
2. Solution:
>> Precise adjustment of injection molding process parameters
>> Check whether the mold size is accurate
>> Control the stability of the molding cycle
10. Cold spots
1. Cold material spot: there are cold material traces on the surface of the product that are not completely melted
2. Solution:
>> Increase the size of cold feed well.
>> Increase the nozzle temperature
>> Optimize the flow path design to reduce cold material generation
11. Poor luster
1. Poor luster: poor surface gloss of the product
2. Solution:
>> Improve the surface finish of the mold
>> Reasonably adjust the injection molding process parameters, such as temperature, pressure, etc. Check whether the raw materials are qualified
12. Release difficulty
1.Demoulding difficulty: the product is not easy to come out of the mold
2. Solution:
>> Check whether the mold release slope is enough
>> Appropriate use of release agent
>> Adjust the injection molding process to avoid excessive pressure preservation
>> Check whether the mold surface is sticky and deal with it