After the plastic parts such as the plastic dustbin mould are injection molded, the plastic parts are ejected from the mold cavity. Whether a single or multi-element ejection mechanism is used, the demolding work is generally completed at one time. But sometimes due to the special shape of the plastic part or the need of production automation, after a demolding work is completed, the plastic part is still difficult to be taken out of the cavity or cannot fall off automatically. At this time, another demoulding action must be added to make the plastic part Fall off.
Difficulty in demolding is mainly because the gate or the plastic part is compressed in the mold. In terms of equipment: insufficient ejector power. Mould: unreasonable demoulding structure or improper position. The draft angle is not enough. Mold temperature is too high or poor ventilation. The runner wall or cavity surface is rough. The nozzle does not conform to the mold inlet or the nozzle diameter is larger than the inlet diameter. Process: the barrel temperature is too high or the injection volume is too much. The injection pressure is too high or the holding and cooling time is too long. In terms of raw materials: insufficient lubricant.
Plastic trash can mold and plastic box mold require a certain amount of time to accumulate. When learning to make molds at the beginning, it is more challenging to complete them all at once. So sum up the reasons for failure, and then sum up the experience, the success rate will be much greater the next time you demold.
