Describe the pack leaving the primary line
Record whether the pack is hot, wet, flexible, newly labelled, under vacuum, top-heavy or vulnerable to seal pressure. These conditions determine conveyor and buffer design.
Hot glass jar
Avoid impact and uncontrolled thermal shock; protect closure and label timing.
Light plastic bottle
Control back pressure, tipping and panel deformation.
Foil-sealed pot
Support the base and prevent lid lift or rim pressure.
Flexible pouch
Avoid sharp transfers, falls and compression on a warm top seal.
Small sachet
Control orientation, counting and bridging into bins or cartons.
Pickle jar with brine
Contain leaks and use materials/cleaning suitable for corrosive or sticky residues.
Inspect only what the system can prove
| Inspection | Possible check | Response |
|---|---|---|
| Fill | Checkweigh, level or other appropriate method. | Reject, hold or investigate according to the producer’s procedure. |
| Closure/seal | Presence, height, skew, vacuum indication, vision or leak method. | Controlled reject with reason traceability where required. |
| Label | Presence, gross position, identity or barcode. | Reject or stop before secondary packing. |
| Code | Presence/readability/data verification. | Hold affected interval if incorrect data is detected. |
| Pack damage | Vision or operator checks for breakage, deformation or leaks. | Safe isolation—especially where glass is involved. |
| Metal/foreign body control | Application-specific validated system where required. | Automatic rejection and challenge/record procedure. |
Define test pieces, challenge frequency, reject confirmation, reject-bin security and what happens when a check fails.
Use accumulation to decouple short interruptions
Buffering can keep the filler running during a label-roll change or brief case-packing delay, but excessive contact pressure can damage packs.
- Calculate the useful buffer in minutes or packs, not just conveyor length.
- Check first-in/first-out needs and whether hot packs can remain stationary together.
- Limit back pressure on labels, closures, pots and flexible bottles.
- Provide controlled restart so a surge does not overwhelm the next machine.
- Design safe access and glass-break or spill procedures.
- Include the buffer in cleaning and allergen-changeover scope.
Select a secondary format around distribution risk
Shrink or sleeve bundle
Groups retail or transport packs; film and heat exposure must suit the primary pack.
Tray and film
Supports unstable packs and provides visible collation.
Carton or case
Protects labels and glass; case size, board grade and packing pattern need definition.
Display-ready case
Adds tear features and print orientation requirements for retail handling.
Sachet collation
Count into bags, cartons or cases and control missed/double counts.
Palletisation
Set case orientation, interlock, layer pad, stretch wrap and pallet constraints.
Balance sustained output, not isolated machine maximums
| Stage | Planning loss or constraint |
|---|---|
| Filling | Dose time, hopper refill, container gating and product behaviour. |
| Closing | Closure feed, placement, application and verification. |
| Labelling | Pack spacing, orientation, roll changes and adhesive contact. |
| Inspection | Sensor response, reject spacing and challenge procedures. |
| Collation | Count pattern, operator loading, case erection and sealing. |
| Changeover/cleaning | Scheduled non-running time that reduces weekly capacity. |
The throughput planner converts weekly demand into a first-pass line rate, but a detailed line study should include availability, changeovers, planned cleaning, micro-stops and staffing.
Run an end-to-end acceptance test with saleable materials
Establish stable input
Provide product and empty packs at the agreed rate and condition.
Run the complete route
Use actual closures, labels, codes and secondary materials.
Introduce normal events
Refill hoppers, change a label roll, replenish closures and clear a controlled reject.
Measure sustained output
Record accepted packs, rejects, stops and reasons over the agreed period.
Inspect final units
Check primary pack quality, collation, case/pallet presentation and traceability.
Review recovery
Demonstrate restart after stops and safe response to spill, breakage or jam scenarios.