Possible cause of the problem
(1). Insufficient injection speed.
(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 tank cannot work.
(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 backstop ring is damaged, and the molten material has a backflow phenomenon.
Approach
(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 melt temperature.
(7). Increase back pressure.
(8). Increase the injection speed.
(9). Check whether there is foreign matter or unplasticized plastic in the nozzle hole.
(10). Check all heater outer layers with an ammeter to verify that the energy output is correct.
(11). Increase the 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.
