A case erecting machine is one of the most maintenance-forgiving machines on a packaging line, and one of the most punishing when maintenance is skipped. The reason is position: it is the first machine in the line, so its reliability determines the reliability of everything downstream.

This checklist is written to be used as it is — printed and posted at the machine, with the intervals as the organising structure. Where a value is given, it is a specification to check against a setting sheet, not a suggestion.

How to Use This Checklist

Three rules make the difference between a checklist that works and one that becomes a wall decoration.

Record the value, not a tick. Writing “vacuum 0.52 bar” creates a trend. Writing a tick creates nothing. Trending is what turns maintenance from reactive to predictive, and it costs no extra time.

Set the interval by consequence, not by convenience. A filter on recycled board clogs in days, not months. Where an interval is given as a range, the low end applies to dusty, recycled, three-shift, or cold-room duty.

Fix the cause, not the symptom. A recurring alarm is a message about a condition upstream — board, storage, temperature, or setup — not an invitation to adjust the machine every week.

Every Shift

Before start-up. Check the magazine stack for squareness and height, confirm that the blank in the magazine matches the recipe selected on the HMI, and verify that all adjustment locks are engaged.

Vacuum system. Listen for leaks around the picking head — a hiss is a leak. Confirm the drain on the local filter-regulator is functioning. Verify that the first picks of the shift are clean and single.

Sealing system. Verify glue or tape position on a sample case against the setting sheet, and check that the glue bead is consistent in shape along its length.

Compression and discharge. Confirm the compression section is clear of debris and that the discharge transfer runs freely. Check the case that comes out for squareness by eye and by feel.

Extraction and safety. Confirm the extraction indicator, if fitted, shows normal. Test the emergency stop and the guard interlocks at the start of the shift rather than assuming.

Every Week

Vacuum filter. Clean or replace the element. Measure the differential if the machine has gauges; anything above 0.05 bar is a restriction.

Suction cups. Inspect for glazing, hardening, cracking and contamination build-up. A cup that has lost its surface texture has lost its seal.

Fold rails. Check alignment against the reference dimension at both ends and in the middle, and remove any glue or dust build-up that changes the effective gap.

Feed system. Check feed belt tension and condition, and inspect the magazine guides for wear.

Sealing components. Clean the glue nozzle or the tape head, check the cut-off blade, and verify tape overlap or glue quantity on a sample.

Guards and covers. Clean the inner faces of guards. Board dust accumulates faster than most operators expect, particularly on machines with tight internal clearances.

Every Month

Squareness measurement. Erect five cases and measure the diagonals. Anything above 2 mm difference on a 400 mm case is a finding to investigate, and anything above 3 mm is a fault.

Glue system. Inspect the nozzle for charring, verify the tank and nozzle temperatures with an external thermometer, and check the filter screen.

Sensor lenses. Clean all optical sensors with the approved method. In humid or dirty environments this is the single most common cause of repeat flap-detection alarms.

Recipes. Verify that stored recipes still produce a square case on trial for the three formats run most often. Recipes drift when they are edited casually during production.

Alarm history. Review alarm counts against the previous month. Rising frequency, not severity, is the leading indicator of a declining line rate.

Drive elements. Check belt tensions and listen for unusual noise from gearboxes and bearings.

Every Quarter

Forming tooling. Inspect the mandrel corners for radius — beyond about 0.5 mm of corner radius, recondition or replace. Check fold rail wear patterns; uneven wear indicates a format running outside its intended adjustment range. Which components are serviceable in place differs between models, and the product range notes where access requires panel removal.

Cam followers and bearings. Inspect for play and for lubrication condition. On machines with grease points, this is when to service them.

Lubrication. Re-grease all points with the specified grade. Record the grade used — a machine lubricated with the wrong grease will fail earlier, and the record is what allows the cause to be found.

Consumables baseline. Re-baseline glue consumption per case and compare against the original specification. A rising figure indicates a nozzle problem or a change in the case.

Precision verification. Re-verify squareness across the case size range, not just at the current format. Repeatability should be re-measured at both the minimum and maximum rated speed.

Hoses and connections. Replace any vacuum or air hose showing surface cracking. Replace flexible hoses as a set rather than individually.

Every Year

Suction cups. Replace or assess against a wear standard. The planning interval is 2 to 3 million picks or 12 months, whichever comes first.

Transport and feed belts. Replace any belt showing surface cracking, glazing or edge fraying.

Mandrel and tooling. Recondition or replace worn forming tooling. Re-verify all setting sheets against measured results rather than against accumulated corrections.

Glue system. Full service including tank cleaning, hose replacement, and calibration of all temperature instrumentation.

Electrical and safety. Verify all safety interlocks, emergency stops and guard switches function correctly. Inspect the control cabinet for dust, loose terminals and cooling fan operation.

Documentation. Update the setting sheets, the lubrication record and the spare parts inventory. Re-baseline the machine’s performance figures — effective CPM, uptime and squareness — so that next year’s trend has a starting point. Templates and standard value ranges are available through our support section.

Component Life Reference

Alarm Reference

The most useful thing a maintenance team can do with this table is to start recording frequency rather than reacting to each occurrence. A machine that logs E-29 twice a month is healthy. A machine that logs it twice a shift has a board, storage or setup problem that no amount of adjustment will solve.

Spares to Hold on Site

Holding the right spares is cheaper than machine downtime, and the list is shorter than most plants assume.

Consumables. Suction cups, vacuum filter elements, glue nozzles, tape cut-off blades, lubrication in the specified grades.

Wear parts. Feed belts, transport belts, guide strips, cam followers, the seals and fittings used on the vacuum circuit.

Fasteners and fittings. The specific sizes used on the adjustment points, held in a labelled kit at the machine rather than in a central store.

Documentation. A current setting sheet for every format, the lubrication schedule, and the electrical drawings.

Instrumentation. A vacuum gauge, a moisture meter, a feeler gauge set, and an external thermometer for glue temperature verification. These four instruments are what convert maintenance from opinion into measurement, and their cost is negligible against a single day of unplanned downtime.

FAQ

How much time should this checklist take?
Shift checks take 10 to 15 minutes; weekly checks 30 to 60 minutes; monthly checks 1 to 2 hours; quarterly and annual checks are scheduled downtime.

What is the most commonly skipped item?
Recording the value. Ticking a box records that someone looked; recording a number builds the trend that predicts failure.

Should I follow the manufacturer’s schedule or this one?
Use this one as the base and tighten any interval where the machine’s duty is harsher than standard — three shifts, recycled board, cold room, or dusty conditions.

What is the single highest-value investment?
A vacuum gauge and a moisture meter. Together they answer most pick and squareness questions in minutes instead of shifts. Standard board and blank values to measure against are in our FAQ, and the cup and vacuum configuration for a given machine is described on the Single-Piece Carton Erector page.

Want a maintenance schedule matched to your machine and duty cycle? Send your machine model, shift pattern, board grade and operating environment to [email protected] or WhatsApp +86 13681839278. Our engineers will return a completed checklist, a spares list and a lubrication specification within 24 hours.