1. The gate must be designed in the area with the largest wall thickness. 2. The gate cannot be placed near the high stress area. 3. For long parts, especially reinforced compounds, such as electric motors, gates should be placed longitudinally rather than laterally or centrally. 4. If there are two or more cavities, the parts and gates should be placed symmetrically along the sprue. 5. Axially symmetric parts, such as gears, discs, blades, etc., preferably use a diaphragm gate and should be provided with a gate at the center, or multiple gates on the three-plate mold to obtain good actual flow characteristics. 6. Parts with integral hinges should be placed away from the hinge point when placing the gate. Under any condition. It should be avoided to design the flow stop portion of the melt near the hinge point. 7. The gate of the cup-shaped part (such as small casing, capacitor cup, etc.) should be designed near the base to avoid air cavitation. 8. For tubular parts, the frit should first fill the circumference of one end and then fill the full length of the tube itself. In this way, the melt flow front can be prevented from creating an asymmetrical shape. 9. When insert molding around the plastic plug, the fuse core and other metal inserts, the molten resin should be able to flow around the insert to minimize inaccuracies in the position of the insert. 10. For exposed surfaces of invisible defects (such as gate marks), the gate may be placed inside and fed to the ejector pin with a ramp gate. 11. On complex parts and multi-cavity molds with different shapes, the gate position should be such that the melt flow front avoids a brief stop during the filling process. 12. These recommendations obviously do not cover all applications, and in practice they always compromise to balance, depending on the complexity of the specific molding process.
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