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Beyond conventional gate types, there is a group of gate designs that are more purpose-built. These gates are not intended for general use. They are designed to solve specific molding challenges, such as uniform filling of large flat surfaces, balanced flow in annular parts, reduced shear in thin-wall products, or concealed gate marks on cosmetic surfaces. In actual...

In injection mold, the gate is far more than a point where melt enters the cavity. It sets the terms for filling, packing, cosmetic quality, and demolding stability. Many defects that appear on the surface — sink marks, weld lines, short shots, flow marks — do not originate at the surface at all. Their root cause is usually...