The downtime of a packaging machine is measured not only by the minutes the machine is stopped, but also by the product that accumulates in front of it and the orders that leave the factory late. In facilities where packaging is the final stage before shipment, a 30-minute stoppage can affect everything that follows. Preventive maintenance shifts maintenance from a reactive response to a planned part of the production schedule, allowing work to be scheduled rather than handled during an unplanned stop.
What Is the Difference Between Preventive Maintenance and Corrective Maintenance?
Corrective maintenance begins when something goes wrong. It includes the time required to diagnose the problem, wait for the repair, and restart the machine. Preventive maintenance, on the other hand, is carried out according to a planned schedule, at a predetermined time when the machine is accessible and safe to maintain. The main difference is not necessarily the amount of work involved, but when the work is performed and whether the timing was planned.
Planned maintenance also makes it possible to complete several tasks during the same scheduled stop. Wear checks, cleaning, calibration, and spare-parts stock inspections can be performed together, rather than requiring four separate stoppages during the month. A well-planned maintenance program can therefore reduce both the number of stoppages and the time spent on them.
Which Packaging Machine Components Require Regular Maintenance?
Wear tends to occur in packaging machine components exposed to repeated contact, heat, or rapid movement. These include the material feeding mechanisms, clamping components at the loading station, belts and conveyors, and the cutting and folding elements in machines that operate from roll stock.
These components should be included in the maintenance plan and monitored regularly.
▪ Sheet feeding and separation mechanisms for packaging material
▪ Product clamping and retention components at the loading station
▪ Conveyor belts, bearings, and drive wheels
▪ Cutting and folding elements in machines that operate from roll stock
▪ Sensors and photoelectric cells that may be affected by dirt
In practice, some faults that appear to be mechanical may, in fact, be caused by dirt. Cardboard residue, product dust, and accumulated oil can interfere with sensor readings and cause the machine to stop even when there is no actual mechanical failure. Regular cleaning should therefore be treated as part of routine maintenance and not as a separate task.
How should maintenance be scheduled in relation to production?
A maintenance program works best when it is coordinated with the production schedule. A practical approach is to schedule maintenance when the line is already stopped, such as during format changeovers, cleaning between products, at the end of a shift, or on a day without production. A short maintenance task performed during a format changeover can avoid the need for a separate maintenance shutdown, while the same task performed in the middle of a production run may require additional downtime.
Maintenance intervals should be based on the manufacturer’s instructions and the machine’s actual operating hours, not on a general calendar. A machine that runs one shift per day and another that runs three shifts may reach the same number of cycles at very different rates. A schedule based only on calendar dates may therefore call for maintenance too early on one machine and too late on another.
How should you determine which spare parts to keep in stock?
An effective spare parts inventory does not need to be large. It should focus on components whose absence could have a significant impact on production. The relevant factor is not simply the price of the component, but what happens if it is not available.
A low-cost component that can stop a line for a week may be more important to keep in stock than an expensive component for which a temporary alternative exists. Therefore, it is useful to classify components according to their expected lead time and the impact their absence may have on production, rather than only by catalog classification.
| Action | When to perform | What does it help prevent? |
| Cleaning sensors and product paths | Whenever you change the format or clean the machine | False stops and feed failures |
| Wear test on gripping components | Based on accumulated operating hours | Product damage and improper packaging |
| Checking belts and conveyors for stretching and wear | During a scheduled shutdown | Slippage, product misalignment, and line stoppage |
| Calibration after component replacement | Immediately after completion of the replacement | An entire batch being packed with deviations |
| Checking the stock of critical spare parts | Regularly | Long wait times for replacement during a breakdown |
In addition to keeping inventory, it is useful to document each maintenance task and each breakdown. After a few months, these records can show which components require attention repeatedly and help determine whether a problem is related to normal wear or to setting and operating conditions.
How Does Machine Design Affect Maintenance Requirements?
Maintenance requirements are influenced in part by the machine’s design and accessibility. A machine that provides good access for servicing, allows feed components to be quickly separated, and enables cleaning without unnecessary disassembly can reduce the time needed for routine maintenance over its service life. The feed system of the MKH-4 cartoner can be separated in one second, showing how quick access to machine components can affect routine maintenance time. Impac designs and manufactures its machines in-house, allowing accessibility and cleaning requirements to be considered during machine specification, not only after installation.
How Does Preventive Maintenance Fit into an Automated Packaging Line?
In an automated packaging line, a stop at one station can interrupt the entire sequence, making an unplanned stoppage more disruptive than it would be in a stand-alone machine. For this reason, maintenance must be planned at the line level, not for each machine individually. Maintenance tasks for multiple stations can be combined within the same scheduled stop, while priority can be given to stations that do not have a bypass. A station that affects a carton in the middle of the sequence has a different priority from a station that can be temporarily bypassed.
Automated packaging machines can also provide useful operational information, including cycle counts, stoppages, and recurring failures. Even without an advanced monitoring system, recording this data at the end of each shift can provide a numerical basis for determining maintenance intervals, rather than relying only on the team’s judgment.
The transition from responding to failures to planned maintenance does not happen overnight. A practical approach is to start with the station that represents the greatest downtime on the line, develop a maintenance plan for it, and then expand this approach to the other stations. This makes it possible to measure results early, before applying the same approach to other stations.
What is the operator’s role in the maintenance program?
Some actions that help prevent stoppages do not require a technician. End-of-shift cleaning, visual inspection of belts and contact areas, and reporting unusual noises or movements can be part of the operator’s daily work. These observations can be useful because operators spend time working with the machine and may notice changes before they develop into a failure.
For this to work, there needs to be a clear person or process for reporting issues, and the records need to be documented. A short end-of-shift checklist with space for comments can turn operators’ observations into useful maintenance data. Without documentation, the same failure may continue recurring without being properly addressed.
Main conclusions for packaging machine maintenance
Reducing downtime starts with shifting from reactive maintenance to planned maintenance: identifying wear-prone components, scheduling maintenance around existing stoppage points, setting intervals based on actual operating hours, and systematically documenting maintenance activities. A well-planned preventive maintenance program can help reduce both the number of stoppages and the time spent on them, while machines designed with good maintenance accessibility can make routine maintenance easier. Contact the Impac engineering team to discuss which accessibility, disassembly, and cleaning features are suitable for your production needs from the machine specification stage.
