Meaning
Automated inspection methods identify incomplete fills in injection moulded parts before they are packaged or shipped. An effective short shot detection system utilizes vision sensors or cavity pressure monitors to verify that the polymer melt has completely filled the mold. This step is critical because a short shot compromises both the structural integrity and the aesthetic quality of the component.
By automating this check, manufacturers prevent defective parts from reaching assembly lines and causing downstream failures.
Optical Monitoring
High resolution cameras capture images of the moulded parts as they are ejected from the tooling. The system analyzes these images for missing features or incorrect boundary dimensions that indicate an incomplete fill. If a discrepancy is found, an alarm is triggered and the conveyor routes the affected batch to a scrap bin.
Pressure Analysis
In mould sensors track the pressure at the end of the flow path to confirm that the melt reached the boundary. A drop in the expected peak pressure indicates that the cavity was not fully packed, pointing to a probable short shot. This pressure analysis can identify internal voids or thin areas that might be missed by a simple camera scan.
Defect Segregation
Connecting the detection system to a diverter gate ensures that any incomplete part is removed from the production flow. This automatic segregation reduces the reliance on manual inspection and maintains a high level of shipment quality.
