Multi-Live-Feed injection molding is more commonly referred to as the Shear Controlled ORientation Injection Molding (ScorimTM) process. The technology was developed at the Wolfson Center for Material Processing, Department of Material Engineering, Brunel University in Uxbridge, Middlesex, England. Rights to the process were acquired by the British Technology Group (BTG).
Scorim is designed to reduce or eliminate weldlines and increase orientation by oscillating the melt in the cavity and maintaining it in a molten state long enough to achieve a better knit of the two flow fronts across the weldline. This oscillation is achieved by injection into the mold through an auxiliary unit that splits the incoming polymer shot into two distinct flows, passing through a sprue bushing with two channels instead of one. Pistons on the Scorim head then work the melt, shearing it, keeping it molten, and finally packing it until gate freeze-off. |