ODM Sprue Bushing: A Key Flow Component in Injection Molds Supplier, Suppliers
Product Description
Function
Melt Guidance & Flow Control
Ensures smooth transfer of molten plastic directly from the machine nozzle into the mold cavity with balanced flow distribution.
Thermal & Pressure Resistance
Engineered from premium steel or aluminum alloys to endure high temperatures and intense injection pressures reliably.
Defect Prevention
Optimized internal passage design actively eliminates cold material traps and air bubbles, raising final product yield.
Frequently Asked Questions (FAQ)
Its primary role is to connect the injection molding machine nozzle to the mold interior, channeling molten resin directly and efficiently into runner channels or part cavities.
Sprue bushings are typically manufactured from wear-resistant tool steels (such as SKD61, H13) or aluminum alloys that can endure continuous exposure to elevated injection temperatures and cyclic clamping forces.
Proper internal geometry and accurate taper angles stabilize flow velocity, regulate melt temperature, and minimize common manufacturing defects such as entrapped air pockets, sink marks, and cold slug inclusions.
Key considerations include resin rheology (flow properties), nozzle contact radius, orifice diameter, cooling efficiency, and the mold base structural requirements under clamping pressure.
Typical indicators include plastic leakage at the nozzle interface, sprue sticking in the mold during ejection, increased flashing around the gate, and visible wear or scratching on the bushing radius.
