A manufacturing cell designed for production of handles and grips made of multiple materials of different thicknesses requiring differing cooling times is new from Italian injection machine supplier Presma SpA (represented here by Presma Corp., East Brunswick, N.J.). In a demonstration, the cell produced a PP handle overmolded with a TPE in one of four different colors, with cycle time from 50 to 60 sec. The cell features two horizontal double-injection units, vertical presses of 110 or 165 tons, a four-cavity mold, a special cooling station, and a six-axis robot for insert and part handling. Parts with large cores use an air-cooling station that reportedly does not extend production cycle times. Parts can be cooled there for a number of cycles before being transferred for overmolding. The lower mold halves are mounted on a sliding table to ease robot loading and unloading and simplify maintenance.
Editor PickA Simpler Way to Calculate Shot Size vs. Barrel Capacity
Let’s take another look at this seemingly dull but oh-so-crucial topic.