Meaning
Runner design technologies manipulate the melt stream within the feed system to balance the filling of multi-cavity moulds. Implementing the beaumont meltflipper repositions the high-shear, high-temperature layers of the polymer to ensure uniform viscosity in each branch of the runner. This corrective action prevents uneven filling and stabilizes part weight across the entire tool.
Shear Distribution
Frictional heating creates asymmetric temperature profiles as the polymer flows through the runner system. Although traditional symmetrical runners deliver equal volume, the material on the inner side of a branch is hotter and less viscous than the material on the outer side. The positioning of these shear layers determines the viscosity of the material entering each cavity.
Cavity Balance
Unbalanced filling leads to variations in dimensions, surface finish, and strength among parts from different cavities. By flipping the flow orientation, the melt splitter delivers material with identical temperature and viscosity to every gate. This uniformity ensures that all cavities pack out under the same pressure profile, which reduces the scrap rate.
When parts are produced with identical physical properties, the downstream assembly processes run much more smoothly because variation is kept to a minimum.
Defect Prevention
Injection moulding operations running multi-cavity tools frequently suffer from short shots or flash due to unbalanced flow. Correcting the melt temperature distribution before it reaches the gate minimizes these moulding defects. The technology eliminates the need to run unbalanced process parameters that can stress the moulding press.
