One, crack and silk pattern
(1) Raw material is not sufficiently dry. Should be appropriate to improve the pre-drying temperature, and extend the drying time.
(2) raw materials mixed with foreign matter impurities. Should be thoroughly removed.
(3) the melt temperature is too high. Should appropriately reduce the molding temperature and adjust the temperature distribution of the barrel.
(4) injection pressure is low. Should be properly improved.
(5) pouring system design is unreasonable. Should be reasonable to adjust the gate and runner layout and cross-sectional size.
(6) forming cycle is long. Should be appropriately shortened.
(7) screw back pressure is too high or too low. Should be properly adjusted.
Second, moire and fog halo
(1) the melt temperature is too low. Should appropriately increase the molding temperature.
(2) injection pressure is too low. Should be properly improved.
(3) screw back pressure is too low. Should be properly improved.
(4) mold temperature is too low. Should be properly improved.
(5) raw materials mixed with foreign matter impurities. Should be completely cleared or replaced with new materials.
(6) raw materials in the moisture and volatile content is too high. Should be dried.
(7) the barrel and its section temperature distribution is unreasonable. Should be properly adjusted.
Third, the weld marks and flow marks
(1) the melt temperature is too low. Should appropriately increase the molding temperature.
(2) injection pressure is too low. Should be properly improved.
(3) insufficient supply. Should be appropriate to increase the amount of feed or for the larger specifications of the injection molding machine.
(4) holding time is too short. Should be extended as appropriate.
(5) supercharging time is too short. Should be extended,
(6) pouring system settings unreasonable. Should improve the flow channel form, the gate should be re-selected openings.
(7) gate and runner obstruction. Should be thoroughly removed.
(8) mold temperature is too low. Should be properly improved.
(9) mold exhaust bad. Add vent holes or reduce clamping force. In the mold line or welding point open exhaust.
Four, swirling
(1) the melt temperature is too high or too low. Should be properly adjusted.
(2) too much supply. Should be appropriately reduced.
(3) improper positioning of the gate. Should re-open the opening.
(4) There is an obstruction in the runner. Should be thoroughly removed.
(5) Nozzle hole obstruction. Should be cleaned up.
(6) mold temperature is too low. Should be properly improved.
Five, dark spots and stripes
(1) mixed with impurities in the raw materials. Should be thoroughly removed.
(2) the melt temperature is too high or too low. Should be properly adjusted.
(3) the temperature distribution of each section of the cylinder is unreasonable. Should be properly adjusted.
(4) injection pressure is too high or too low. Should be properly adjusted.
(5) flow channel and gate section is too small. Improper positioning, flow resistance is too large. Should be appropriate to enlarge the gate and the flow section, check the runner with or without obstruction.
(6) mold exhaust bad. Should be appropriate to increase the rolling pores, improve the mold exhaust performance.
(7) barrel and nozzle local hot spots and stagnation dead ends. Should be repaired stagnation dead ends, eliminate hot spots.
Six, rough surface and poor gloss
(1) the melt temperature is too low. Should appropriately increase the molding temperature.
(2) injection pressure is too low. Celebration should be improved.
(3) mold temperature is too low. Should be properly improved.
(4) insufficient supply. Should be appropriate to increase.
(5) the gate is not properly. Should re-open the opening.
(6) lack of cooling time. Should be extended as appropriate.
(7) There are obstructions in the runner. Flow material filling poor. The mold stopper should be cleaned.
(8) mold cavity surface finish bad. Should be polished to improve surface finish.
Seven, bubble and shrinkage
(1) Raw material is not sufficiently dry. Should be dry, and appropriate to improve the drying temperature and extend the drying time.
(2) the melt temperature is too high. Should appropriately reduce the molding temperature.
(3) injection pressure is too low. Should be properly improved.
(4) holding time is too short. Should be extended as appropriate.
(5) There are obstructions in the runner. Should be thoroughly cleaned.
(6) mold temperature is too low. Should be properly improved.
(7) plastic parts in the mold cooling time is too long. Should be properly shortened, it is best to release the plastic parts after the hot water bath in the slow cooling.
Eight, peeling stratification
(1) raw materials mixed with foreign matter impurities. Should be completely cleared or replaced with new materials.
(2) insufficient supply. Should be appropriate to increase or change the specifications of the larger injection molding machine.
(3) mold temperature is too low. Should be properly improved.