Flow channel length: From the material inlet to each cavity, the flow length should be the same for all cavity.

Flow channel diameter: Similar to the importance of the flow channel length, the flow diameter of the flow channel must be equal to each cavity. Changing the flow diameter will cause new problems.

Gate cross-sectional area: For multi-cavity molds, adjusting the size of the gate can also achieve the purpose of simultaneous feeding of the cavity. The gate also plays a role in preventing early solidification and causing the melt in the cavity to flow backward. The gate is usually made to have the smallest cross-section in the pouring, which is beneficial to the separation of the plastic part and the gate after the plastic part is injected.

Cooling: Effective cooling is necessary to ensure that there is no difference in the temperature of the injection mold.

Exhaust: The gas generated in the cavity due to various reasons can not be eliminated during the injection process, then it will cause molding defects of plastic parts products, such as bubbles, filling dissatisfaction, welding seams, etc.

Clamping: If the same clamping pressure is not available on the injection mold, uneven venting may occur.

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