The reason and countermeasure of high gate of injection molded parts

In the process of injection molding, the gate is an important channel for the injection of molten plastic into the cavity, and the cooling rate at the gate is relatively slow, which is easy to form a high gate. This paper will analyze the reasons for the high gate of injection molded parts and the corresponding countermeasures.

Cause one: The gate position is unreasonable

When the location of the gate is far away from the cavity, the plastic is easy to produce pressure loss during the injection of the cavity, resulting in an increase in the amount of plastic remaining at the gate, resulting in the formation of a high gate. Therefore, the reasonable design of gate location, so that it is as close to the cavity as possible, can reduce the occurrence of high gate.

Cause two: The injection speed is too fast

Too fast an injection speed will result in too much plastic remaining at the gate, resulting in a high gate. Properly reducing the injection speed can make the plastic injection cavity more stable and reduce the occurrence of high gate.

Cause 3: Mold temperature is too high

Too high mold temperature will slow down the cooling rate of the plastic, which will increase the amount of plastic remaining at the gate and form a high gate. Keeping the mold temperature stable and reducing the mold temperature properly can effectively reduce the occurrence of high gate.

Countermeasure one: Adjust the gate position

Reasonable design of gate location, so that it is as close to the cavity as possible, can reduce the occurrence of high gate. At the same time, according to the product structure and injection molding process conditions, choose the right type of gate, such as direct gate, side gate, point gate, etc., can also effectively reduce the occurrence of high gate.

Strategy two: Adjust the injection speed

Excessive injection speed is one of the common reasons for high gating. Properly reducing the injection speed can make the plastic injection cavity more stable and reduce the occurrence of high gate. At the same time, according to the product structure and injection process conditions, adjust the injection speed and pressure holding time and other parameters, can also effectively reduce the occurrence of high gate.

Countermeasure three: Adjust the mold temperature

Too high mold temperature will slow down the cooling rate of the plastic, which will increase the amount of plastic remaining at the gate and form a high gate. Keeping the mold temperature stable and reducing the mold temperature properly can effectively reduce the occurrence of high gate. At the same time, according to the product structure and injection molding process conditions, adjust the cooling time and cooling water arrangement and other parameters, can also effectively reduce the occurrence of high gate.

Reasonable design of gate position, adjustment of injection speed and mold temperature can effectively reduce the occurrence of gate height in injection molded parts. In actual production, the above countermeasures should be flexibly applied according to the product structure and injection molding process conditions to improve the quality and efficiency of injection molding.