Injection Mold Runner And Gate Design

Hobbyists typically remove the parts of a model kit from the runner using a sharp craft knife or razor saw.

Injection mold runner and gate design.

The spherical surface sr of the mold sprue should be 1 2mm larger than the nozzle sr of the injection molding machine. Sprues runners and gates fulfill the function of conveying the plastics melt from the nozzle of the injection unit to the individual cavities. The gate is the location at which the molten plastic enters the mold cavity and is often evidenced by a small nub or projection the gate mark on the molded piece. First every mold has a sprue.

The rule of thumb in traditional mold design is that the runner should be round and equal to the part s nominal wall stock at the gate. Design standard for sprue. This is the contact point between the machine and the mold. Ates and runners are an essential part of the injection molding process.

With each branch going back to the sprue the runner s diameter should increase 10 to 15 and then intersect the sprue base. There are three channels in which the plastic flows from the injection molding machine into the part cavity. 1 injection molding machine nozzle and sprue matching. Injection mold runner and gate design standards hot runner design guidelines three plate runner and pin point gate design standards.