Injection Mold Runner And Gate Design

For the complicate product it s necessary to make mold flow analysis to help design a good runner system and gate position.

Injection mold runner and gate design.

Sprues runners and gates fulfill the function of conveying the plastics melt from the nozzle of the injection unit to the individual cavities. Design standard for sprue. First every mold has a sprue. There are three channels in which the plastic flows from the injection molding machine into the part cavity.

Hobbyists typically remove the parts of a model kit from the runner using a sharp craft knife or razor saw. 1 injection molding machine nozzle and sprue matching. The spherical surface sr of the mold sprue should be 1 2mm larger than the nozzle sr of the injection molding machine. 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.

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. Injection mold runner and gate design standards hot runner design guidelines three plate runner and pin point gate design standards. While it is true that those plastic material may be reused in the form of regrind their presence nevertheless means a reduction in the performance of the injection molding machine inasmuch as they. With each branch going back to the sprue the runner s diameter should increase 10 to 15 and then intersect the sprue base.