What problems are most likely to occur in the mold injection molding process
Aug 20, 2021
The pre-manufacturing process of a mold has been completed, and the final step is formed by injection molding, and samples can be produced. Is everything going well in the injection molding process? In fact, it is not. In the process of injection molding, there will be many problems, and the most likely defect is the incompleteness of the injection molded part.
What is the reason for this problem? There are mainly the following:
(1) The injection speed is insufficient.
(2). Plastic shortage
(3). The screw does not leave the screw gasket 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 part is sealed.
(8). The heater outside the nozzle or the injection cylinder cannot operate.
(9). The injection time is too short.
(10). The plastic is attached to the throat wall of the hopper.
(11). The capacity of the injection molding machine is too small (ie, injection weight or plasticizing capacity).
(12). The mold temperature is too low.
(13). The anti-rust oil of the mold is not cleaned up.
(14). The stop ring is damaged, and the molten material flows backwards.
How to solve these problems?
(1). Increase the 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 whether the check valve is worn or cracked.
(5). Check whether the operation is stable.
(6). Increase the melting temperature.
(7). Increase back pressure.
(8). Increase the injection speed.
(9). Check the nozzle hole for foreign matter or unplasticized plastic.
(10). Check the outer layer of all heaters and use an ammeter to check whether the energy output is correct.
(11). Increase the screw forward time.
(12). Increase the cooling capacity of the throat area of the hopper, or reduce the temperature of the rear area of the shooting cylinder.
(13). Use a larger injection molding machine.
(14). Increase the mold temperature appropriately.
(15). Clean up the rust inhibitor in the mold.
(16). Check or replace the backstop ring.
