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How to remedy the defects of injection molding parts

Injection molding technology is now the core technology in the model industry, but we should not think that it is Injection molding technology There are no defects in the core technology. It is totally impossible for even human beings to be 100% perfect. In view of the defects of injection molding technology, the following information is given for your reference.

Under filling:

1、 Characteristics of defects in injection molded parts

The injection process is incomplete because the mold cavity is not filled with plastic or the injection process lacks certain details.

2、 Possible causes of problems

(1) Insufficient injection speed.

(2) There is a shortage of plastics.

(3) There is no screw pad left at the end of the stroke.

(4) Running time changes.

(5) The temperature of the injection cylinder is too low.

(6) Insufficient injection pressure.

(7) The nozzle is partially sealed.

(8) The heater outside the nozzle or injection cylinder does not work.

(9) Injection time is too short.

(10) The plastic is attached to the hopper throat wall.

(11) The capacity of the injection molding machine is too small (i.e. injection weight or plasticizing capacity).

(12) Mold temperature is too low.

(13) The rust preventive oil of the mould was not cleaned up.

(14) The retaining ring is damaged and the molten material has backflow phenomenon.

3、 Remedies

(1) Increase injection speed.

(2) Check the amount of plastic in the hopper.

(3) Check whether the injection stroke is set correctly and change it if necessary.

(4) Check the check valve for wear or cracks.

(5) Check whether the operation is stable.

(6) Increase melt temperature.

(7) Increase back pressure.

(8) Increase injection speed.

(9) Check the nozzle hole for foreign matter or unplasticized plastic.

(10) Check the outer layer of all heaters and check whether the energy output is correct with an ammeter.

(11) Increase screw forward time.

(12) Increase the cooling capacity in the throat area of the hopper or reduce the temperature in the rear area of the injection cylinder.

(13) Use a larger injection molding machine.

(14) Increase mold temperature properly.

(15) Clean the anti rust agent in the mold.

(16) Check or replace the retaining ring. Dimensional difference of injection molded parts.