The plastic parts filled with discontent.
1. Features of defect of injection molding.
The injection process is incomplete because the cavity is not filled with plastic or the process of injection is missing some details.
2. Possible causes of problems.
(1) insufficient injection speed.
(2). Plastic shortage.
(3) the screw does not leave a screw cushion at the end of the stroke.
(4) change of operating time.
(5) the temperature of the shooting cylinder is too low.
(6) insufficient injection pressure.
(7). The nozzle part is sealed.
(8) the heater outside the nozzle or the cylinder is not functioning.
(9). The injection time is too short.
(10). Plastic is attached to the wall of the hopper.
(11). The capacity of injection molding machine is too small (that is, injection weight or plasticizing capacity).
(12). Mold temperature is too low.(13). There is no anti-rust oil for cleaning the mold.
(14). The stop ring is damaged and the molten material has a reverse flow.
3. Remedies
(1). Increase the injection speed.
(2). Check the amount of plastic in the hopper.
(3). Check whether the injection schedule is set correctly and change it if necessary.
(4) check whether the check valve is worn or cracked.
(5) check whether the operation is stable.
(6) increase the melt temperature.
(7) increase back pressure.
(8). Increase the injection speed.
(9). Check whether the nozzle hole has foreign body or plasticized plastic.
(10). Check whether the energy output is correct with the ampere meter in all the heaters.
(11) increase the screw forward time.
(12). The cooling capacity of the hopper throat area, or lower the temperature after the injection cylinder.
(13). Use a larger injection molding machine.
(14). Appropriate elevation of mold temperature.
(15). Clean the rust inhibitor in the mold.
(16) check or replace the check ring.