Evaluating injection molding problems starts with a controlled description of the defect and evidence from material, mold, machine, process, design, measurement, and handling. Changing several settings at once can make a temporary improvement while removing the evidence needed to find the cause.
Describe the problem precisely
- Record defect type, location, cavity, part revision, severity, frequency, lot, shift, and time of onset.
- Separate appearance, dimension, fit, strength, leakage, and functional failures; they may have different causes.
- Contain suspect material and preserve good and bad samples, photographs, measurements, and machine records.
Check the process chain
- Verify resin identity, drying, storage, color, regrind, contamination, and lot traceability.
- Inspect gates, runners, vents, cooling, parting surfaces, ejectors, inserts, wear, and cavity balance.
- Confirm machine calibration, temperatures, pressure, speed, cushion, screw recovery, cycle, and alarms.
- Review wall thickness, flow length, draft, ribs, bosses, shrinkage assumptions, and tolerance allocation.
- Confirm gauges, datums, lighting, sampling, and measurement repeatability.
Correct with evidence
Use a controlled trial or DOE when variables interact. Change one factor where practical, record the result, confirm the correction over a stable run, and update the control plan. A diagnosis is complete only when the cause, correction, verification, and recurrence prevention are documented.
Plan the next step
Share your part, resin, annual volume, critical dimensions, finish, and timing with the Cavity Mold team through our contact page. We can review the manufacturing risks and recommend a practical next step.
Related Cavity Mold resources
- Plastic injection molding services
- Injection mold engineering services
- Injection mold making services
- Contact Cavity Mold