1.Injection molding gate is a small opening between the runners and the mold cavity. their location, quantity, shape and size, etc. have a great influence on product appearance, dimensional , physical characteristics and production efficiency.

2.The gate size is dependent on product weight, material and gate types. The length, depth and width of a gate should be minimized as long as that product physicall performance and production efficiency can be guaranteed.

3.If the gate is too small, injection molding defects like uncompleted filling, sink mark and flow marks will occur, and molding shrinkage rate will increase.

4.If the gate is too big, excessive residual stress may happen around the gate, cause deformation or cracks on production, and also it will be difficult to remove the gate after molding.