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What should I do if transparent plastic parts encounter these problems?
What should I do if transparent plastic parts encounter these problems? Please see below:
First, cracks and silk
(1) The raw materials are not sufficiently dried. The pre-drying temperature should be appropriately increased and the drying time should be extended.
(2) Foreign materials are mixed with foreign matter impurities. It should be completely removed.
(3) The melt temperature is too high. The molding temperature should be appropriately lowered and the temperature distribution of the cylinder should be adjusted.
(4) Injection pressure is low. Should be properly improved.
(5) The design of the gating system is unreasonable. The layout of the gate and runner and the size of the section should be adjusted reasonably.
(6) The molding cycle is long. Should be shortened as appropriate.
(7) The screw back pressure is too high or too low. Should be adjusted appropriately.
Second, moiré and halo
(1) The melt temperature is too low. The molding temperature should be appropriately increased.
(2) The injection pressure is too low. Should be properly improved.
(3) The screw back pressure is too low. Should be properly improved.
(4) The mold temperature is too low. Should be properly improved.
(5) Foreign materials are mixed with foreign matter impurities. The new material should be completely removed or replaced.
(6) The moisture and volatile content of the raw materials are too high. It should be dried.
(7) The temperature distribution of the barrel and its section is unreasonable. Should be adjusted appropriately.
Third, weld marks and flow marks
(1) The melt temperature is too low. The molding temperature should be appropriately increased.
(2) The injection pressure is too low. Should be properly improved.
(3) Insufficient supply. Appropriately increase the amount of feed or change the size of the injection molding machine.
(4) The holding time is too short. Should be extended appropriately.
(5) The boost time is too short. Should be extended appropriately,
(6) The pouring system setting is unreasonable. The flow path should be improved and the gate should be re-selected.
(7) There are obstructions in the gate and runner. It should be completely removed.
(8) The mold temperature is too low. Should be properly improved.
(9) The mold is poorly exhausted. Vents should be added or the clamping force should be reduced. Exhaust at the mold line or weld point.
Four, swirl
(1) The melt temperature is too high or too low. Should be adjusted appropriately.
(2) Too much feed. Should be reduced appropriately.
(3) The gate is not properly positioned. The opening should be re-selected.
(4) There are obstructions in the gate flow path. It should be completely removed.
(5) The nozzle hole is blocked. It should be cleaned up.
(6) The mold temperature is too low. Should be properly improved.
Five, black spots and stripes
(1) Impurities are mixed into the raw materials. It should be completely removed.
(2) The melt temperature is too high or too low. Should be adjusted appropriately.
(3) The temperature distribution of each section of the barrel is unreasonable. Should be adjusted appropriately.
(4) The injection pressure is too high or too low. Should be adjusted appropriately.
(5) The flow path and gate cross section are too small. Improper positioning and too much flow resistance. The gate and runner section should be properly enlarged to check for obstructions in the runner.
(6) The mold is poorly exhausted. The helium hole should be appropriately increased to improve the exhaust performance of the mold.
(7) There are hot spots and dead spots in the barrel and nozzle. The dead angle of the stagnant material should be repaired to eliminate the hot spot.
Sixth, the surface is rough and poor gloss
(1) The melt temperature is too low. The molding temperature should be appropriately increased.
(2) The injection pressure is too low. Celebrate the appropriate increase.
(3) The mold temperature is too low. Should be properly improved.
(4) Insufficient supply. Should be increased appropriately.
(5) The gate is not properly set. The opening should be re-selected.
(6) The cooling time is insufficient. Should be extended appropriately.
(7) There is a blockage in the runner. The filling material is not filled smoothly. The mold blockage should be cleaned.
(8) The surface finish of the mold cavity is too poor. It should be ground and polished to improve the surface finish.
Seven, bubbles and shrinkage holes
(1) The raw material is not sufficiently dried. Drying should be carried out, and the drying temperature should be appropriately increased and the drying time should be prolonged.
(2) The melt temperature is too high. The molding temperature should be appropriately lowered.
(3) The injection pressure is too low. Should be properly improved.
(4) The holding time is too short. Should be extended appropriately.
(5) There is a blockage in the runner. It should be thoroughly cleaned up.
(6) The mold temperature is too low. Should be properly improved.
(7) The cooling time of the plastic parts in the mold is too long. Should be properly shortened, it is best to put the demoulded plastic parts in a hot water bath to slow down.
Eight, peeling stratification
(1) Foreign matter impurities are mixed into the raw material. The new material should be completely removed or replaced.
(2) Insufficient supply. Injection molding machines with larger specifications should be added or replaced as appropriate.
(3) The mold temperature is too low. Should be properly improved.