A Practical Approach to Serialization on Existing Blister Lines
Serialization is the process of assigning a unique identity to each saleable medicine pack and connecting that identity with its batch, expiry date, and production history. For a blister operation, it usually involves much more than adding a camera and printing a code. The upgrade affects artwork, line controls, packaging materials, site procedures, data systems, validation, and the way finished goods move through the supply chain.
Australian pharmaceutical manufacturers face a particularly practical set of requirements. Products may be released for the domestic market, supplied through the Pharmaceutical Benefits Scheme, or exported across several regulatory jurisdictions. A pack made in Melbourne can pass through a national wholesaler before reaching a pharmacy in Perth, so reliable aggregation and clear exception handling matter as much as the mark printed on the carton.
The most effective strategy is usually a staged retrofit. The existing blister machine, cartoner, and case packer should be assessed as one connected process, even when serialization is initially required only at carton level. This approach avoids creating a reliable code on a single pack while leaving gaps in data ownership, reject control, or shipping documentation.
A successful project also respects production reality. Operators need equipment that is easy to clean and adjust, maintenance teams need access to cameras and printers, and quality personnel need evidence that each control performs consistently. A sensible design protects throughput while creating a dependable chain of custody for every serialized unit.
Start With the Existing Packaging Process
The first step is a detailed line survey rather than an immediate equipment purchase. Record the product formats, blister dimensions, carton styles, leaflet positions, line speeds, changeover times, batch sizes, and reject arrangements. Note where packs accumulate, where they can rotate or overlap, and whether the carton has a suitable print area for a 2D Data Matrix code.
A blister line may produce a sealed dose unit, but many pharmaceutical markets identify the saleable carton rather than the individual blister. The project team must therefore define the required packaging hierarchy: blister, bundle, carton, shipper, and pallet. If the carton is the serialized item, the vision system must confirm the code after printing and link it to the correct product and batch record.
Pay close attention to equipment that was never designed to exchange production data. Older cartoners may provide only basic run signals, while case packers may have no interface for receiving serial numbers. A retrofit can still work, but the control architecture may need an industrial PC, programmable logic controller connection, barcode readers, and a dedicated line-management layer.
A useful survey should include operators from the morning, afternoon, and night shifts. They often know about small stoppages, awkward access points, and format changes that do not appear in engineering drawings. For Australian sites running long campaigns to manage labour and freight costs, these practical observations can determine whether a proposed system remains usable during a demanding production run.
Build the Data Architecture Before Buying Hardware
Serialization hardware includes printers, cameras, reject stations, scanners, and aggregation equipment. The software structure behind those devices is equally important. At the enterprise level, a site may use an enterprise resource planning system, a manufacturing execution system, a line controller, and a local database. Each layer should have a clearly defined responsibility for creating, reserving, transmitting, and retiring serial numbers.
The usual sequence begins with a product and batch order. The system receives a serial number range, sends individual numbers to the line, combines each number with the product code, batch and expiry data, and records whether the pack was accepted or rejected. At case and pallet level, aggregation records then show which cartons were packed inside which shipping units.
Do not assume that a global standard automatically resolves every local need. GS1 standards, including the Global Trade Item Number and Serial Shipping Container Code, provide a strong foundation, while GS1 Australia can help align identifiers with domestic supply-chain expectations. The site still needs rules for rework, damaged cartons, duplicate numbers, unreadable codes, line clearance, and reconciliation at the end of a batch.
Cybersecurity and system availability deserve early attention. A short network interruption should not leave operators guessing whether a serial number was consumed. The line should move into a controlled state, preserve the event history, and support safe recovery. Data backups, user permissions, audit trails, and time synchronisation should be tested as part of the design rather than added after installation.
Match Serialization Equipment to the Line
The best equipment arrangement depends on the available print surface, speed, product range, and desired packaging level. A high-resolution thermal inkjet or laser printer may be suitable for cartons, while a thermal transfer system can suit some coated materials. The code reader must be positioned where vibration, glare, dust, and carton movement will not compromise inspection.
| Packaging point | Typical control | Key design question | Common failure risk |
|---|---|---|---|
| Carton printing | 2D Data Matrix printer and camera | Is there enough contrast and space? | Smudged or poorly positioned code |
| Carton verification | Vision inspection with reject device | Can every pack be stopped or diverted safely? | False acceptance or uncontrolled rejects |
| Bundle or case packing | Aggregation scanner | Can pack identity be linked to the case? | Manual packing without reliable records |
| Pallet preparation | Case and pallet aggregation | Is the hierarchy preserved through dispatch? | Mixed cases or incomplete shipping data |
| Line control | Serialization software and PLC interface | What happens during a network interruption? | Duplicate, missing, or unreconciled numbers |
Retrofitting a blister line often works best when printing and inspection are placed after cartoning, where the pack is stable and the code can be checked before the carton enters a case. If the carton surface is curved, glossy, or crowded with consumer information, artwork may need revision. The change should be managed with the same discipline as any other regulated packaging-component update.
Reject handling is a critical design decision. A system that merely signals a fault without physically separating the suspect carton creates an investigation burden. The reject bin should be access-controlled, capacity-monitored, and designed so that an operator cannot accidentally return an unverified pack to the good-product stream. Clear alarms should distinguish a bad code, a missing code, a wrong product, and a system communication fault.
During supplier research, an independent packaging perspective can be useful when comparing presentation, usability, and the practical impact of artwork changes. The technical supplier should still provide formal specifications, drawings, validation documents, and support commitments for the selected installation.
Adapt the Design to Australian Supply Chains
Australia’s regulatory environment should be considered from the start. The Therapeutic Goods Administration regulates medicines and maintains the Australian Register of Therapeutic Goods, but serialization obligations can also be driven by export destinations, contract-manufacturing agreements, or a multinational brand owner. A site may need to support several coding rules and reporting formats on the same packaging line.
Domestic distribution creates its own operational demands. Pharmaceutical products can travel from a plant near Sydney or Melbourne to wholesalers in Brisbane, Adelaide, Darwin, or Perth. Long transport routes and hot conditions make robust carton identification, tamper evidence, and reliable shipping-unit records valuable even when a specific domestic mandate does not require item-level serialization.
Contract manufacturers should agree early on who owns serial-number commissioning and reporting. A brand owner may supply the number ranges while the Australian site controls the line and retains production evidence. Another arrangement may require the manufacturer to manage the complete process and transmit status data to a partner’s repository. Ambiguity in this area can delay batch release.
The site should also account for Australian English, local date conventions, and the way operators interpret labels and screens. Expiry formats need to be unambiguous, especially where products are exported. Training materials should use the terminology found in the approved procedures, and support arrangements should cover public holidays, shift work, and remote sites rather than assuming a supplier is always available in the same time zone.
Validate the Controls From Code to Case
Validation should demonstrate that the system performs consistently under normal and adverse conditions. Installation qualification confirms that equipment, software, utilities, and connections match the approved design. Operational qualification challenges functions such as code generation, camera inspection, reject operation, user access, alarm handling, and data recovery.
Performance qualification should use representative products and real operating conditions. Test different carton formats, print speeds, line stops, planned changeovers, and foreseeable sources of dust or vibration. Include difficult but realistic scenarios: a deliberately damaged code, a rejected carton entering the wrong lane, an interrupted network connection, a printer fault, and a restart after an emergency stop.
Reconciliation is one of the most important tests. At the end of a batch, the number of serial numbers issued, printed, accepted, rejected, reworked, commissioned, and decommissioned should balance according to approved rules. Any unexplained difference should stop release until the cause is investigated and documented.
The quality system should define how deviations are handled and who can release a recovered batch. Electronic records need appropriate audit trails, backups, access controls, and retention periods. If the line is connected to a cloud or external repository, the validation package should cover interfaces and data transfer, not just the local printer and camera.
Prepare People for the Retrofit
Operators should be involved well before the equipment arrives. Their training needs to cover loading codes, confirming the correct product, responding to alarms, clearing rejects, performing line clearance, and escalating uncertain situations. A short practical exercise on a training batch is usually more effective than a long presentation filled with system terminology.
Maintenance staff need access to spare printheads, camera lenses, lighting components, belts, sensors, and communication hardware. Preventive-maintenance schedules should include calibration checks, lens cleaning, printer servicing, reject-device testing, and verification that software versions remain approved. A modest stock of critical parts can prevent a minor fault from becoming a multi-day production delay.
Quality and production teams should agree on performance measures before go-live. Useful measures include first-pass read rate, false-reject rate, serial-number reconciliation time, unplanned downtime, changeover duration, and the number of manual interventions. These indicators show whether the retrofit is improving control without quietly reducing line efficiency.
A phased rollout is safer than changing every product and line at once. Start with one representative format, run engineering trials, complete qualification, and monitor several commercial batches. Lessons from that line can then inform the next installation. This approach is particularly suitable for Australian manufacturers balancing domestic supply with export orders and limited specialist engineering resources.
Prioritise the Decisions That Protect Release
A practical implementation should keep attention on decisions that affect product identity, data integrity, and operator control. The following priorities help turn a complex upgrade into a manageable project:
- Define the serialized unit, packaging hierarchy, and reporting obligations before selecting equipment.
- Survey every carton format and confirm print quality, camera access, reject capacity, and changeover requirements.
- Assign ownership for serial-number generation, commissioning, aggregation, reconciliation, and batch-release evidence.
- Test network loss, printer faults, unreadable codes, duplicate numbers, manual interventions, and recovery procedures.
- Train production, quality, engineering, and warehouse teams using the actual line and approved operating instructions.
Cost should be assessed across the equipment life cycle rather than by purchase price alone. Installation, validation, software licensing, coding consumables, service response, spare parts, format tooling, and future product additions can materially change the business case. A lower-cost printer may become expensive if it requires frequent cleaning or produces excessive false rejects.
The strongest retrofit is one that fits the physical line, the electronic data flow, and the habits of the people running it. By surveying the process carefully, choosing standards-based architecture, validating each control, and allowing for Australian distribution conditions, a manufacturer can add traceability without turning every changeover into a production crisis.