The feed port should be located in the thicker part of the product to ensure smooth and complete mold filling, and should be located where it does not affect the appearance and function of the product, the tie rod can be located at the edge or bottom, in the cold cavity near the gate In order to facilitate the demoulding of runners, large or flat products, it is recommended to use multi-point feeding to prevent product warpage and material shortage. Its position should be selected in the shortest place during the plastic filling process to reduce pressure loss, facilitate mold exhaust, and avoid opening the gate near the slender core, so as to prevent material flow from directly impacting the core, resulting in deformation, dislocation or bending.

The size of the gate is determined by the size, geometry, structure and plastic type of the product, and can be modified according to the mold test conditions. Through mold flow analysis or experience, it can be judged whether the product seam line caused by the gate position affects the appearance and function of the product. , which can be solved by increasing the cold material cavity. When a mold has multiple cavities, a symmetrical casting method is used for the same product.