Reducing Coding Downtime on Pharmaceutical Production Lines

Coding downtime rarely appears on a pharmaceutical plant's headline KPIs, but it is one of the most persistent sources of production friction. A packaging line stopped for a nozzle wipe or a cartridge changeover is not producing units, and a stopped line at the coding station propagates upstream in minutes. The good news is that most coding downtime is preventable with a set of small operating routines and a stable consumables supply.

This article outlines what usually causes coding-line downtime and how pharmaceutical manufacturers can reduce it. Axion Group supplies coding consumables and works with production teams on this kind of practical improvement.

What causes coding line downtime

The recurring causes of coding-related downtime in our experience:

• Cartridge changeovers happening more often than the cartridge lifetime warrants — usually because the cartridge was not stored or handled correctly.
• Nozzle-plate wipe cycles taking too long — usually because the standard operating procedure has drifted or has never been documented.
• Consumable stock-outs at the plant — a cartridge is unavailable when needed and the line waits.
• Cartridge/ink incompatibility with a substrate lot that has changed — the line is stopped for a substitution or a substrate swap.
• Verification failures at the vision station downstream — the coder was fine, but the code was marginal for the camera settings and the line rejects.

Each has a different fix, but a common thread runs through them: a small daily routine at the coder is the highest-return investment.

Preventive maintenance basics

The preventive maintenance routine that reduces the greatest number of stop events:

• Cap cartridges when the line is idle for more than the coder manufacturer's documented threshold.
• Wipe the nozzle plate with the recommended cloth at the start and end of each shift.
• Log cartridge in-service hours against the manufacturer's documented cartridge life; replace before the end of life rather than at the first bad print.
• Store cartridges under the documented storage conditions and rotate stock so oldest-in is used first.
• Keep the coder's operating environment (ambient temperature, humidity) within the documented range.

None of these steps take more than a few minutes per shift. Their absence is what compounds into hours of downtime per month.

Cartridge management

For pharmaceutical customers, the practical items:

• Have a single-page reference of approved cartridge references for each coder in the plant.
• Include the substrate the cartridge was last trialled against and the trial reference number.
• Set a reorder point that reflects the actual consumption rate plus lead time from your supplier, not a legacy value.
• Have a documented substitution — for each cartridge, know the approved secondary cartridge and its trial reference.

This last point matters. A single-source cartridge with no approved backup means that the entire line's ability to code depends on one supplier's on-time delivery. A qualified alternate takes weeks to trial and approve; it is not something you can do during a stock-out.

Consumables supply reliability

Consumable supply is a supply-chain function, not just a purchasing function. The measures that reduce coding downtime on the supply side:

• Two-source strategy for the primary cartridge family, both qualified and approved.
• Documented lead times per supplier, refreshed quarterly.
• Buffer stock sized to the line's actual monthly consumption plus the longer of the two supplier lead times.
• Regular technical touchpoints with the supplier — not only when a problem exists.

Axion Group works within customer supply-chain frameworks and can support qualification of a secondary cartridge alongside a primary. Product suitability is subject to application testing under the customer's actual production conditions.

Building an escalation process

When a coding issue does escalate, having a documented path saves hours:

1. First-line operator response — cap, wipe, replace cartridge from immediate stock.
2. Second-line engineer response — check line data, substrate lot, ambient conditions; log the event.
3. Supplier escalation — with substrate lot, cartridge lot, and line data in hand, not a symptom alone.
4. Post-event review — root cause captured; PM routine updated if needed.

Every step short of the last one is designed to keep the line running. The last step is designed to keep the same issue from returning next month.