This article begins a four-part series that will describe the current competitive conditions in the plastics tooling industry and what some companies are doing to grow their businesses amidst challenging conditions.
This article continues our series of troubleshooting reports from one of the leading on-the-spot problem solvers in the molding industry.
Part/material: Polyurethane plugs.
Tool: Probably four-cavity, two-plate mold with a heated sprue bushing.
Symptoms/problem: Flow lines, voids, depressions.
Solution: Enlarge feedpoint to the runner and nozzle orifice and remove restriction to flow in that location; gate from the middle, not edge, of the subrunner.
This article continues our series of troubleshooting reports from one of the leading on-the-spot problem solvers in the molding industry.
Symptoms/problem: Sink, flow lines, and slow cycle time.
Solution: Increase diameter of subrunners, main runner, sprue O-diameter, and nozzle orifice; adjust gate depth and land; reduce barrel heats and injection pressure; modify injection and hold pressure.