Lack of material Generally in the plastic processing process, because the cavity of the mold is not fully filled, the phenomenon that the shape of the part does not match the design is called lack of material.
(1) Equipment method
There are many process factors that cause plastic parts to be short of materials. The most important reasons are low filling pressure, short injection time and low mold temperature. When the filling pressure is small, the injection molding machine will cause insufficient pressure in the cavity during injection molding. It is difficult for the plastic to fill the entire cavity, resulting in a shortage of parts; short injection time will also cause the plastic to not completely fill the cavity, resulting in a lack of parts. The low mold temperature will accelerate the solidification of the plastic, reduce the fluidity of the liquid, and cause the plastic to not fill the entire cavity, resulting in a shortage of materials.
(2) Equipment reasons
The main cause of the equipment shortage of plastic parts is the nozzle part, which is usually the nozzle blockage. The general method is to clean the nozzle to solve it; the nozzle leakage can also cause the material shortage. Such failures generally require the nozzle to be replaced.
(3) Mould reason
Generally, it is caused by the unsmooth exhaust inside the mold. As the air accumulated in the cavity cannot be discharged, it will cause insufficient plastic filling, resulting in shortage of materials. The measures to be taken are to reduce the filling speed of the plastic or increase the corresponding exhaust on the mold. Stomata.
Due to blockage of the hot runner or unbalanced flow, the plastic melt does not flow smoothly, resulting in a shortage of parts. The general measures are to increase the temperature of the hot runner corresponding to the lack of materials and use delicate and clean raw materials.
