Capsule Printing and Inkjet Coding Procedure SOP
Capsule Printing and Inkjet Coding Procedure SOP helps you qualify approved inks, set print parameters, and verify legibility, placement, and adhesion before release. Use it to control on-capsule marking and document deviations when print quality falls outside tolerance.
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Built for: Pharmaceutical Manufacturing · Nutraceutical Manufacturing · Contract Packaging · Quality Control Laboratories
Overview
This SOP template defines the controlled workflow for printing or inkjet coding capsules and verifying that the mark is readable, correctly placed, and adheres to the capsule surface. It is built for situations where the ink must be approved before use, the equipment must be checked before startup, and the first sample must pass inspection before the run is released.
Use this template when capsule marking is part of your product identification, batch coding, or traceability process and you need a documented sequence for setup, verification, and escalation. It is especially useful for new product introductions, ink changes, equipment changeovers, and routine production where print quality can drift over time. The procedure helps you capture the actor, step, verification, and deviation path so the line does not rely on memory.
Do not use this template as a generic packaging SOP for cartons, labels, or blister packs. It is also not the right fit if your site does not print directly on capsules or if the marking method is outside your approved process. If the ink is hazardous, the procedure should be paired with site PPE, permit-to-work, and handling controls before any run begins.
Standards & compliance context
- The template supports ISO 9001-style documented information control by recording approved materials, verification steps, and release decisions.
- It fits GMP-oriented quality systems by making line clearance, traceability, and non-conformance handling explicit for capsule marking.
- If hazardous inks or solvents are used, add site PPE, SDS handling, and permit-to-work controls before the procedure is executed.
- Where print defects could create product identification risk, the SOP should include escalation to quality review and product segregation.
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
Steps
This section matters because it turns capsule printing into a repeatable sequence with clear actors, verification points, and escalation triggers.
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Verify the work order and approved ink status
The QA technician verifies that the work order lot number matches the approved ink batch code exactly, confirms the product and code specification are current, and records the reconciliation in the batch record before release.
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Inspect the equipment and print station
The equipment technician verifies nozzle pressure is 20–25 bar (±2 bar tolerance), nozzle temperature is 45–50 °C, and no visible ink residue or blockage is present; record readings on the Daily Equipment Log; if pressure deviates >2 bar, escalate to maintenance and do not proceed.
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Prepare and identify the ink sample
The QA technician retrieves the approved ink batch, confirms the batch number, expiry date, and container label against the work order, and stages the sample in a clean tray away from other inks. Acceptance criteria: the ink container is intact, clearly labeled, within expiry, and matches the approved batch record exactly.
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Set the print parameters
The equipment technician enters the approved code content, print location, font or pattern, and line speed settings into the capsule printing or inkjet coding equipment, then saves the setup record before starting the run. Acceptance criteria: the displayed parameters match the approved specification and are recorded in the setup log.
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Run the initial print sample
The production operator prints a small sample of capsules using the approved setup and places the sample in the inspection tray without mixing it with released product. Acceptance criteria: the sample is representative of the run and clearly identified for inspection.
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Inspect print legibility and placement
The QA technician inspects the sample under adequate lighting using a magnifier or inspection loupe, confirms the code is readable, correctly oriented, and within the approved placement tolerance, and records the result on the inspection log. Acceptance criteria: the code is legible, complete, correctly positioned, and matches the approved content with no blur, skip, or misalignment.
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Perform the adhesion check
The QA technician performs the approved adhesion test on the printed sample, such as rubbing the code with 70% isopropyl alcohol for 10 seconds or using the site-approved equivalent method, and documents the result. Acceptance criteria: the print does not smear, flake, transfer, or lift during the test.
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Release the run or escalate a deviation
The line supervisor reviews the inspection and adhesion results and determines whether the run may continue or must be escalated. Acceptance criteria: if both checks pass, the run is released; if any defect, legibility issue, or adhesion failure is present, the process is escalated and affected product is held.
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Continue production and monitor at defined intervals
The production operator continues the run and performs periodic checks at the defined batch interval, confirming print quality, placement, and adhesion remain within specification. Acceptance criteria: all scheduled checks are documented and remain within the approved limits throughout production.
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Quarantine affected product and notify supervision
The quality technician or line supervisor immediately segregates all affected capsules, applies quarantine identification, and notifies supervision and quality for deviation review. Acceptance criteria: affected product is clearly labeled, physically separated from conforming product, and a deviation report is initiated.
How to use this template
- 1. The quality or production owner enters the approved work order details, ink status, capsule specification, and acceptance criteria into the SOP before the run starts.
- 2. The operator verifies the print station condition, confirms required tools and PPE, and removes any unapproved ink, residue, or damaged components from the area.
- 3. The operator identifies the ink sample, checks lot status and expiry, and loads only the approved ink for the specific capsule and code format.
- 4. The operator sets the print parameters, runs the initial sample, and compares the result against the defined legibility, placement, and adhesion tolerance.
- 5. The operator records the outcome, releases the run if all checks pass, or escalates a deviation and quarantines affected product if any verification fails.
Best practices
- Verify ink approval status against the current work order before the first capsule is printed.
- Photograph the first acceptable sample and any defect condition so the acceptance standard is visible during later review.
- Check legibility, placement, and adhesion as separate verifications instead of treating them as one combined pass/fail decision.
- Define the tolerance for code darkness, character distortion, and print position in the SOP so operators do not guess.
- Escalate immediately if the first sample smears, skips, doubles, or prints outside the approved area.
- Recheck print quality after stoppages, nozzle cleaning, ink change, or any parameter adjustment that could affect output.
- Keep the ink container, sample, and run record linked by lot number so traceability is preserved during investigations.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What does this SOP template cover?
This SOP template covers the controlled steps for verifying the work order, confirming approved ink status, inspecting the print station, setting print parameters, running an initial sample, checking legibility and placement, performing adhesion testing, and releasing or escalating the run. It is written for on-capsule printing and inkjet coding where print quality must be consistent and documented. It also gives you a place to record deviations, non-conformance, and corrective action.
When should this procedure be used?
Use it whenever capsules are printed or inkjet coded as part of production, changeover, qualification, or rework. It is especially useful when a new ink lot, new capsule substrate, new print station, or new code format is introduced. If the process is not printing on the capsule surface, this template is not the right fit.
Who should run this SOP?
A trained operator or line lead usually performs the setup and initial checks, while a competent person or quality role confirms acceptance when required. If the process involves hazardous inks, solvents, or a permit-to-work environment, the responsible supervisor should verify the controls before release. The template is designed so each role can be assigned clearly.
How often should print quality be checked?
Check at startup, after any parameter change, after ink replacement, after a stoppage that could affect print quality, and at the cadence defined by your quality plan. Many teams also add periodic in-process verification during the run to catch drift in legibility, placement, or adhesion. The exact frequency should match your risk assessment and product requirements.
Does this SOP support regulatory or quality system requirements?
Yes. It supports documented information control under ISO 9001-style quality systems by capturing approved materials, verification steps, and release decisions. It also fits GMP-oriented environments where traceability, line clearance, and non-conformance handling matter. If hazardous inks or solvents are used, the procedure can be aligned with site safety controls and permit-to-work practices.
What are the most common mistakes this template helps prevent?
Common failures include using an unapproved ink, skipping the initial sample check, accepting faint or smeared codes, and overlooking poor adhesion after handling. Another frequent issue is failing to document a deviation when print quality drifts outside tolerance. This SOP makes those checks explicit so the run is not released on assumption.
Can I customize this SOP for different capsule sizes or print methods?
Yes. You can adapt the acceptance criteria, sample count, print location, and inspection method for different capsule sizes, colors, or code formats. The same structure also works for thermal inkjet, continuous inkjet, or other on-capsule marking methods as long as the verification criteria are updated. Keep the actor, step, and escalation logic intact.
How does this compare with an ad-hoc print check?
An ad-hoc check usually catches problems only when someone notices them, which can leave gaps in traceability and release decisions. This SOP creates a repeatable sequence for setup, verification, and escalation so the same criteria are used every time. That makes it easier to train operators, audit the process, and investigate non-conformance.
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