Coating Thickness DFT Verification Log - Film and Foil Converting
Use this log to verify dry film thickness across film and foil converting lines at defined web positions, capture gauge checks, and document any out-of-spec readings before release.
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Built for: Film Converting · Foil Converting · Flexible Packaging · Coated Materials Manufacturing
Overview
This template is a production inspection log for verifying dry film thickness on film and foil converting lines. It is designed to capture the job or lot being run, the coating specification and tolerance, the gauge used, calibration verification, and measured values at defined web positions so the team can confirm whether the coating is within spec before the material moves forward.
Use it when thickness is a controlled quality characteristic and variation across the web matters, such as during startup, after a setup change, after a coating adjustment, or during periodic in-process checks. The log helps the inspector document the exact measurement locations, record reference standard results, and flag any non-conformance with containment and corrective action. That makes it useful for QA release, process troubleshooting, and traceability when a customer questions a roll or lot.
Do not use this as a generic coating checklist for cosmetic appearance only. If the process does not require measured DFT, or if the coating is not accessible to the selected gauge method, this template should be replaced with a more appropriate inspection form. It also should not be used as a substitute for a formal calibration record; it only verifies that the gauge was checked and suitable for the task at the time of inspection.
Standards & compliance context
- The template supports ISO 9001-style control of monitored characteristics by documenting the measurement method, results, and disposition of non-conforming output.
- Calibration verification and reference standard checks align with common quality system expectations for measurement traceability and gauge control.
- If the coated material is used in a regulated end product, the log can be adapted to customer requirements, internal quality procedures, and applicable industry standards.
- When thickness affects product safety or performance, treat out-of-tolerance results as a controlled non-conformance and document containment before release.
- This form is not a substitute for a formal calibration certificate or a validated test method when those are required by your quality system.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Setup and Specification
This section establishes the exact job, material, tolerance, and measurement map so the inspector is checking the right product in the right places.
- Job, roll, or lot identification recorded
- Substrate type confirmed
- Coating specification and target DFT available at point of use
- Acceptance tolerance documented
- Measurement locations defined across web width and machine direction
-
Environmental conditions suitable for measurement
Record whether temperature, humidity, and line conditions are within the site’s approved measurement method.
Gauge Calibration and Verification
This section proves the instrument was suitable and checked before use, which is essential for trusting the thickness readings.
- Gauge identification recorded
- Calibration status current
- Zero check performed before measurement
- Verification with calibration foil or reference standard completed
- Reference standard value and observed reading recorded
- Gauge method appropriate for substrate and coating system
Web Position Measurements
This section captures the actual DFT readings across the web so edge-to-center variation and local defects are visible.
- Drive side web position DFT
- Center web position DFT
- Operator side web position DFT
- Additional intermediate web positions measured
- All measured values within specification tolerance
Process Stability and Non-Conformance
This section records whether the run stayed in control and what happened when a reading fell outside the acceptance limit.
- Thickness variation across web is within control limits
- Any out-of-spec reading identified and contained
- Corrective action documented for any non-conformance
Documentation and Closeout
This section completes the traceability trail with signatures, timestamps, evidence, and review approval.
- Measurement record complete and legible
- Photo evidence attached for setup or failed readings
- Inspector name recorded
- Inspection date and time recorded
- Supervisor or QA review required
How to use this template
- Enter the job, roll, or lot ID, confirm the substrate and coating specification, and define the web positions that must be measured for the run.
- Record the gauge ID, confirm calibration is current, perform a zero check, and verify the instrument against a foil or reference standard before taking production readings.
- Measure dry film thickness at the drive side, center, operator side, and any intermediate web positions required by the control plan, then record each value in the log.
- Compare every reading to the acceptance tolerance, note any variation trend across the web, and contain the affected material immediately if a reading is out of spec.
- Document corrective action, attach photo evidence for setup issues or failed readings, and route the completed record to the supervisor or QA reviewer for closeout.
Best practices
- Measure at the same web positions on every run so trends can be compared across shifts, jobs, and operators.
- Verify the gauge on a reference standard immediately before production readings, not after the run is complete.
- Record the actual observed reading from the reference standard, not just that the check passed.
- Flag any out-of-spec reading as a non-conformance and identify the affected roll or lot before it leaves the line.
- Use a gauge method that matches the substrate and coating system so the reading is meaningful for the material being inspected.
- Capture environmental conditions when they can affect measurement stability, especially if the gauge or coating is sensitive to temperature or humidity.
- Attach photos of setup conditions, damaged samples, or failed readings so QA can review the issue without recreating the event.
- Keep the acceptance tolerance visible at the point of use so the inspector does not rely on memory during the walk-through.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What does this DFT verification log cover?
This template covers dry film thickness checks on film and foil converting lines, including job identification, substrate confirmation, gauge calibration, web-position measurements, and closeout. It is built for recording readings across the drive side, center, operator side, and any intermediate positions. The log also captures out-of-spec results and corrective actions so the record is usable for quality review.
When should I use this template?
Use it during setup, first-article verification, in-process checks, changeovers, and any time coating uniformity is a release criterion. It is especially useful when the coating specification calls for thickness control across the web, not just a single average reading. If the process is not coating-based or thickness is not a controlled quality characteristic, this template is probably not the right fit.
Who should complete the inspection?
A trained operator, line lead, quality inspector, or process technician can complete it, depending on your site procedure. The key requirement is that the person understands the gauge method, the acceptance tolerance, and where to take readings on the web. Final review is typically assigned to QA or a supervisor when a non-conformance is found or when release requires sign-off.
How often should DFT be checked on a converting line?
The cadence should follow your control plan, work instruction, or customer specification. Many teams check at startup, after setup changes, after coating adjustments, and at defined intervals during the run. If the process has known drift or width variation, increase the frequency at the edges and after any machine interruption.
Does this template align with quality or regulatory expectations?
Yes, it supports ISO 9001-style control of monitored characteristics by documenting the measurement method, results, and disposition of non-conforming output. It also fits standard quality practices for traceability, calibration control, and corrective action. If your coating is tied to a regulated end use, you can adapt the log to match customer, industry, or internal compliance requirements.
What are the most common mistakes when using a DFT log?
The most common issues are skipping gauge zero checks, recording only one web position, using a gauge that is not suitable for the substrate, and failing to document the reference standard used for verification. Another frequent gap is noting an out-of-spec reading without containing the affected roll or lot. This template is designed to prevent those omissions by making each step explicit.
Can I customize this for different coating systems or substrates?
Yes, the template is meant to be adapted for your coating chemistry, substrate type, and acceptance limits. You can add fields for primer, topcoat, adhesive layer, or special web positions if your process needs them. If you run multiple SKUs, it also helps to include product-specific tolerances or reference standards on the same log.
How does this compare with an ad-hoc spreadsheet or handwritten note?
An ad-hoc note often misses calibration evidence, location mapping, or the link between a bad reading and the affected material. This template forces a consistent walk-through from setup to closeout, which makes reviews faster and reduces ambiguity during investigations. It also creates a cleaner record for QA release, customer audits, and internal trend analysis.
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