How to Conduct a Risk Assessment for Blister Packaging Equipment
Blister packaging equipment combines forming, product loading, sealing, coding, cutting and discharge in one coordinated production line. Each stage can introduce hazards involving heat, pressure, moving tooling, electrical energy, medicines, packaging materials and human intervention. A structured assessment helps a manufacturer control these risks before they cause injury, contamination, rejected batches or unplanned downtime.
For Australian pharmaceutical and consumer goods businesses, the assessment should address both worker safety and product quality. A machine may comply with its intended design while still creating risks during cleaning, format changes, fault recovery or maintenance. These activities often occur more frequently than expected, particularly on flexible lines serving several pack sizes or products.
The local operating environment also matters. A contract packer in Sydney may run multiple shifts to meet pharmacy and hospital demand, while a smaller producer in Melbourne or Brisbane may have fewer engineering staff available at night. High temperatures, dust, humidity and supply delays can affect guarding, sensors and packaging materials. The risk review should therefore reflect the real site, workforce and production schedule rather than relying only on a supplier’s standard documentation.
Define the equipment and its operating boundaries
Begin by describing the complete blister line, including the blister machine, feeder, forming station, sealing unit, printer, vision system, perforator, cutter, cartoner and any connection to downstream case packing. Record the machine’s intended materials, speed range, temperature settings, compressed-air pressure, electrical supply and permitted product types. Include ancillary systems such as conveyors, vacuum pumps, chillers and dust extraction.
The assessment must cover every stage of the equipment life cycle. Normal production is only one part of the review. Consider delivery, installation, commissioning, validation, format changeover, cleaning, inspection, jam clearing, planned maintenance, software updates, decommissioning and disposal. A person may be exposed to a hazard when the line is stopped but still contains stored energy or hot tooling.
Draw a simple process map and mark points where operators interact with the line. Typical access points include the forming and sealing stations, foil and web threading areas, reject bins, product hoppers and cutter assemblies. Note who may enter each zone: operators, mechanics, electricians, quality personnel, cleaners, contractors or visitors. Their training and access permissions will differ.
If the line is integrated with other machinery, assess the interface rather than treating each machine separately. A cartoner can start after a blister machine fault, or a conveyor may continue moving while an upstream guard is open. Emergency stops, safety relays, access doors and restart controls must operate consistently across the entire production cell.
Identify hazards across the full production cycle
Mechanical hazards commonly arise from nip points, rotating rollers, reciprocating tooling, guillotines, indexing chains and automatic reject mechanisms. Forming and cutting stations can crush fingers, while a narrow gap near a moving web can draw in gloves or clothing. Guards should prevent access during operation, and fixed guards should require tools for removal where routine access is unnecessary.
Thermal hazards deserve specific attention. Heated forming plates and sealing bars may remain hot after the machine is isolated. Operators can also be burned by hot plastic, rejected foil or tooling surfaces during a rapid changeover. Specify cool-down periods, warning labels, temperature indication and safe handling equipment. A written procedure should state how a worker verifies that a hot zone is safe before contact.
Stored energy includes electricity, compressed air, vacuum, hydraulic pressure, spring force and elevated components. A pneumatic actuator can move after the main switch is turned off if air remains trapped in the circuit. Similarly, a suspended tooling plate may descend when a support is removed. Isolation points, bleed-down valves and mechanical restraints should be identified during the assessment and labelled on the equipment.
Chemical and quality hazards should be assessed alongside physical hazards. Cleaning agents, lubricants, inks, adhesives and pharmaceutical powders may irritate skin or create inhalation risks. In Australia, a Safety Data Sheet and suitable control measures are expected for hazardous chemicals under workplace health and safety arrangements. The review should also consider cross-contamination, incorrect foil, wrong product loading and poor seal integrity, since a safe machine can still produce an unsafe medicine.
The risk review should examine foreseeable human behaviour without blaming operators. People may reach into a machine to remove a single misplaced tablet, bypass a sensor to diagnose a fault or use a tool that is not specified in the manual. These actions become more likely when the line is difficult to clean, when targets are tight or when access doors cause frequent nuisance stops. Design changes are generally stronger controls than relying on reminders.
Practical hazard prompts
- Moving tooling, cutters, rollers and indexing mechanisms
- Heat, steam, compressed air, vacuum and electrical energy
- Dust, cleaning chemicals, inks and pharmaceutical residues
- Incorrect product, damaged packs, poor seals and rejected material
| Assessment area | Questions to document | Typical control |
|---|---|---|
| Mechanical movement | Can a person reach a nip, cutter or indexing part during operation? | Fixed guarding, interlocked doors and safe distances |
| Thermal energy | Which surfaces remain hot after a stop? | Insulation, temperature display, labels and cool-down procedure |
| Stored energy | Can pneumatic, electrical or spring energy cause movement after isolation? | Lockout/tagout, bleed valves and mechanical blocking |
| Product quality | Could the line mix products or release poorly sealed packs? | Line clearance, recipe control, vision inspection and seal checks |
| Human interaction | How are jams, cleaning and changeovers performed? | Validated work instructions, tools and controlled access |
Evaluate risk and select proportionate controls
After identifying hazards, estimate the risk by considering the possible consequence, the likelihood of exposure and the effectiveness of existing controls. A crushing injury at a cutter may be severe even if access is infrequent. A minor foil edge cut may occur often and still require engineering attention. Record the reasoning behind the rating so that different assessors reach consistent decisions.
Use a recognised workplace risk method, but do not allow a numerical score to replace judgement. Risk matrices can help prioritise action, while a hierarchy of controls should guide the solution. Eliminate unnecessary manual access first. Then consider guarding, interlocks, safe design, automated fault recovery, administrative controls and personal protective equipment in that order.
For pharmaceutical lines, include quality risk management in the same review. A seal temperature drift, incorrect forming depth or tablet feed problem can result in a batch failure or patient risk. Controls may include recipe permissions, barcode verification, metal detection, camera inspection, in-process seal testing and electronic batch records. These controls should be assessed for failure modes, not simply listed as features.
Australian sites should align the assessment with applicable work health and safety duties in their state or territory. Safe Work Australia provides model guidance, while legal requirements are administered by jurisdictions such as SafeWork NSW, WorkSafe Victoria and workplace safety regulators in Queensland and other states. The business should verify the current local rules, consultation duties, plant registration requirements and electrical obligations rather than assuming one national process applies identically everywhere.
For therapeutic goods, the Therapeutic Goods Administration’s good manufacturing practice expectations are also relevant. Equipment should be suitable for its intended use, cleanable, maintainable and supported by controlled procedures and records. A risk assessment should link safety controls with validation, calibration, preventive maintenance and change control. Any modification to a sealing station, feeder or software-controlled recipe may require a new review.
Verify safeguards during commissioning and routine use
A safeguard is effective only when it works under realistic conditions. During commissioning, test each guard switch, emergency stop, light curtain, pressure sensor and safe-speed function. Confirm that hazardous movement stops within an acceptable time and that stored energy does not create a secondary hazard. Test faults such as an open access door, failed sensor, loss of air pressure and power restoration.
Restart behaviour is particularly important. After an emergency stop or power failure, the machine should not resume automatically when power returns. A reset should require a deliberate action from a position where the operator can confirm that nobody is in the danger zone. Where several machines are linked, test the effect of every stop and reset across the connected line.
Routine inspections should include guard condition, interlock alignment, emergency-stop accessibility, warning labels, cable integrity, air leaks and unusual noise. Maintenance records should show what was checked, who performed it and what defects were corrected. A damaged transparent guard or unreliable door switch should be treated as a safety defect, not postponed until the next major service.
Lockout and tagout deserves a practical demonstration. An authorised person should isolate electrical, pneumatic, vacuum and other energy sources, release residual energy, apply personal locks and verify zero energy before work begins. Contractors need site-specific induction, and production staff should know when they must stop and call maintenance rather than attempting an unsafe intervention.
Operator training should use the actual machine and common scenarios. Include threading material, clearing a jam, changing a forming tool, handling rejects, cleaning product contact areas and responding to an alarm. Training is more reliable when competence is observed and recorded, rather than demonstrated only through a signed attendance sheet.
Maintain the assessment as the line changes
A risk assessment is a controlled operational document, not a file created once for commissioning. Review it after an incident, near miss, equipment modification, new product, revised packaging material or change in production speed. A new supplier may alter the properties of foil, PVC, PVDC, aluminium laminate or paper-based lidding, affecting sealing temperature, cutting behaviour and dust generation.
Changeover frequency is a useful local consideration. Australian businesses supplying pharmacies, hospitals and supermarkets may produce short runs of many stock keeping units. Frequent format changes increase the number of times staff handle tooling, adjust guides and enter the equipment area. The assessment should examine whether quick-change features genuinely reduce exposure or simply move the hazard to a less controlled task.
Keep risk documents connected to the machine file. Useful records include the equipment specification, layout drawing, electrical schematic, pneumatic diagram, guarding assessment, validation protocol, maintenance schedule, training evidence, inspection results and corrective actions. Where a line includes related equipment such as capsule filling equipment, assess the transfer points and shared controls so that one machine cannot create an unexpected hazard for another.
Periodic review should involve people who perform the work. Operators often know which guard is difficult to close, which sensor causes nuisance trips and which cleaning step requires awkward posture. Maintenance technicians can identify hidden energy and recurring failures, while quality personnel can identify mix-up or contamination risks. Consultation produces a more accurate assessment and helps staff understand why controls must remain in place.
Records that support ongoing control
- Approved risk assessment with revision history
- Equipment manuals, diagrams and conformity documentation
- Guard, emergency-stop and isolation test results
- Training, maintenance, deviation and corrective-action records
A mature assessment connects worker protection, product integrity and reliable output. It explains the hazards in plain language, assigns responsibility for each control and sets a review trigger. It also recognises that a blister line is a system of people, software, materials and machines. When those elements are assessed together, Australian manufacturers can reduce injury exposure while improving batch consistency, audit readiness and dependable supply.