Mold Cooling Channel Cleaning Checklist: Before, During and After Service

Quick answer: A useful cleaning record identifies each cooling circuit, documents its condition before service, records the method and operating conditions used, and repeats the same flow and leak checks afterward. Compare readings only when the test setup is sufficiently consistent; do not use one universal flow target for every mold.

This checklist is designed for maintenance teams planning or documenting a service. The mold owner and equipment supplier must define safe pressure limits, connection requirements, compatible materials, and acceptance criteria for the specific tool.

Before cleaning: identify and baseline

Check	Record or confirm
Mold identity	Mold number, part, press or cell, date, technician, and service reason
Circuit map	Mark each inlet and outlet; record circuit names and any known series or parallel branches
External setup	Check temperature-control unit, hoses, couplings, manifold, valves, and accessible filters
Baseline readings	For each circuit, record flow and available pressure readings using the same instrument and connection points
Thermal context	Record inlet and return temperature when measured; note process symptoms such as longer cooling or local hot spots
Sample and condition	Capture outlet-water appearance separately by circuit; photograph deposits and leaks
Material constraints	Confirm mold steel, coatings, inserts, seals, fittings, and approved cleaning media where known
Safety	Isolate the circuit from production, depressurize according to site procedure, manage electrical and hot-water hazards, and contain discharged liquid

For each reading, note the test duration, fluid, inlet temperature, valve position, and instrument ID. These details make later comparisons meaningful. Autodesk's cooling-circuit documentation explains that flow distribution can differ between branches and that circuit layout and pressure drop affect results; this is why a historical baseline for the same circuit is valuable.

During cleaning: keep the record circuit-specific

1. Confirm the circuit ID before connecting equipment. Keep adjacent circuits isolated if the selected procedure requires one-at-a-time service.
2. Record the cleaning equipment, connection arrangement, medium, and the approved operating settings used. Follow the equipment and mold suppliers' instructions for limits.
3. Note interruptions, abnormal pressure behavior, unexpected discharge, leaks, or a change in sample appearance.
4. Keep the discharge contained and dispose of it under the site's applicable environmental and chemical-handling procedures.
5. If the circuit does not respond as expected, stop and reassess. Do not keep increasing pressure or change cleaning chemistry without confirming compatibility and the cause of restriction.

The deposit identification guide can help teams document whether a sample appears hard, corrosive, soft, or mixed. Visual inspection remains a screening step rather than chemical confirmation.

After cleaning: repeat the checks

Repeat the same circuit-level flow test using the original connection points and comparable test conditions. Then:

• Check the circuit and fittings for leakage.
• Record outlet-water appearance and any remaining visible debris.
• Compare flow and pressure with the baseline, noting differences in test conditions.
• Record any repaired fitting, changed valve, replaced hose, or other intervention so its effect is not mistaken for cleaning performance.
• Confirm that the circuit is returned to the production setup and that the process owner has accepted the condition.

Use the flow-testing guide for individual-channel testing and the standardized cleaning workflow for repeatable procedures.

Simple service record template

Field	Entry
Mold / circuit ID
Reason for service
Baseline flow and test conditions
Sample observations
Approved cleaning method and medium
Settings and interruptions
Post-service flow and test conditions
Leak check / visible condition
Repairs or follow-up required
Technician / reviewer / date

Common mistakes to avoid

• Combining samples from multiple circuits and losing the location of the problem.
• Comparing readings taken with different hoses, valves, instruments, or inlet temperatures without noting the change.
• Treating a flow increase as proof that the entire cooling problem is solved. Part quality, mold temperature, leaks, and process settings may also need review.
• Treating all deposits as the same material or selecting a chemical without checking compatibility.
• Recording a nominal equipment setting instead of the actual circuit, setup, and observed result.

Frequently asked questions

What is a good flow rate for a mold cooling channel?

There is no single value suitable for all molds. Use the mold design, process requirements, equipment limits, and a repeatable baseline for each circuit. Autodesk notes that flow and pressure requirements depend on circuit design and conditions.

How often should a mold channel be cleaned?

Set an inspection and service interval from the mold's criticality, water conditions, measured flow trend, storage conditions, and production symptoms. A trend-based interval is more useful than applying the same calendar schedule to every tool.

What should be included in before-and-after evidence?

At minimum, record circuit identity, test conditions, flow readings, leak status, visible discharge, and any changes to the external setup. Add thermal or process observations where the application requires them.

Technical references

• Autodesk Moldflow, Parallel and Series Cooling Circuits
• Autodesk Moldflow, Pressure Drops in Cooling Channels