1. The plastic inlet should be set in the thick portion of the product to ensure smooth and complete filling.

2, as far as possible in the open without affecting the product appearance and function, can be at the edge or at the bottom;

3, in the vicinity of the gate of the cold material, as often as possible to set the pull rod, in order to facilitate the sprue release;

4, large or flat products, it is recommended to use a multi-point pouring, to prevent product warping and deformation and lack of material;

5. Its location should be chosen so that the plastic filling process is the shortest place, so as to reduce the pressure loss and facilitate the mold exhaust;

6, in the vicinity of the slender core to avoid opening the gate, in order to avoid direct impact on the core of the material flow, resulting in deformation or misalignment;

7, the size of the gate is determined by the product size, geometry, structure and type of plastic, can take a small size and then modify according to the test mode;

8, through the mold flow analysis or experience, determine the product due to the location of the gate and the resulting line, whether the product appearance and function, can be set up to solve the cold material points;

9. In the case of multiple holes, the same product adopts the symmetric pouring method. When different products are molded in the same mold, the largest product is placed in the position close to the main channel.