The quality defects and solutions that are easy to occur in
injection molded products are as follows:
1. The amount of melt compound is insufficient.
Give enough molten plastic. (Increase the amount of melt glue).
2. Improper equipment selection.
Use an injection molding machine with the right amount of injection. The weight of plastic parts is generally theoretical injection
Less than 85% of the amount.
3. The hopper is not fully loaded.
Check the particle size of the material and use a uniform material.
4. The fluidity of the raw materials is too poor.
Check the proportion of the nozzle volume and add plasticizer. Or replace materials with good fluidity.
5. The cold material impurities block the flow path.
Clean the nozzle, increase the diameter of the nozzle, and increase the cross section of the cold well or runner.
6. The design of the gating system is unreasonable.
Multi-cavity mold runners are unbalanced, gate sizes are inconsistent, and runners are thin
Small and long. Improved runner design.
7. The mold is poorly vented.
Strengthen the mold exhaust. Open the vent hole on the mold or 0.02-0.04MM,
The groove with a width of 5-10 MM is at the final filling.
8. The mold temperature is too low.
Control the cooling flow in the mold, increase the mold temperature or use the mold temperature machine.
9. The melt temperature is too low.
If the temperature of the cylinder is too low, the plasticity of the plastic is poor, and the temperature setting should be increased appropriately.
Check if the heating ring is heating normally.
10. The nozzle temperature is too low.
When the temperature of the nozzle is too low, the resistance increases when the melt is injected, and the pressure loss is large.
Check if the heating ring is heating normally. If the cold hole of the mold is small or there is no blockage of the cold material, the temperature of the nozzle should be increased.
11. Insufficient injection pressure.
Appropriately increase the injection pressure.
12. Insufficient injection and holding time.
Properly extend the injection time. Thick-walled parts require a longer hold time.
13. The holding pressure is insufficient.
Appropriately increase the holding pressure.
14. The injection rate is too slow or too fast.
The injection speed is too slow, the product is difficult to fill, and the mold may be exhausted too quickly.
Poor. At the same time, too slow may cause the product to appear rhyolite, too quickly causing the product to melt and form a silver streak.
15. The injection setting is not reasonable.
For products with inconsistent wall thickness, the cut is set in the segmentation at the time of injection.
When the transposition is unreasonable and the pressure speed is uncoordinated, it will cause the wall to be too thin to be filled, and the wall thickness portion will be subjected to excessive injection pressure to form a blunt.
16. The mold structure design is unreasonable.
The wall of the workpiece is thin, the projection area is large, or the wall thickness of the workpiece is extremely uneven.
Thin walls are too thin to make them difficult to fill. Change the structural wall thickness.
17. The back pressure is too low.
For foaming materials or some under-formed forming materials, the back pressure is too low
It will also lead to the occurrence of under-injection, so there should be a moderate amount of back pressure.
18. The machine screw is worn.
Repair the screw or replace it. The gap between the screw and the barrel wall is too large, which will result in
When the glue is injected, some of the rubber is reflowed, and the pressure of the shot is lost.
19. The screw is passed through the rubber meson.
Overhaul the rubber meson or replace it. Glue meson wear will make the seal function
It is out of adjustment during the injection of the glue, causing the injection pressure to be unstable and the molten rubber to flow back.
20. The piston oil seal in the injection cylinder is damaged.
Check the replacement oil seal to prevent leakage. Piston oil seal leak
Injection pressure loss.
twenty one. The spool of the injection oil valve is worn.
Repair or replace the oil valve to prevent leakage. Injection valve spool leakage
Causes injection pressure loss.
twenty two. The oil temperature is too high.
Check if the water circulation system of the oil cooler is unobstructed. Keep the cooling water flowing.
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