Case Sealers in End-of-Line Packaging
Case sealers close and seal the top flaps of filled cases before palletising. They are the final step in the case packing process and must operate reliably to maintain line efficiency. Used case sealers are widely available and represent straightforward, cost-effective equipment purchases.
Sealing Methods
| Method | Advantages | Considerations |
|---|---|---|
| Pressure-sensitive tape | Simple, low cost, no warm-up | Tape cost, less tamper-evident |
| Hot-melt glue | Tamper-evident, clean finish | Requires warm-up, glue system maintenance |
| Stapling | Very secure closure | Not suitable for all products, safety concerns |
Critical Inspection Points
- Tape head condition — worn cutting blades and pressure rollers cause uneven tape application
- Flap folding mechanism — inspect folding ploughs and compression bars for consistent flap closure
- Case guiding system — adjustable side rails and top guides must accommodate your case size range
- Hot-melt system — if glue-based, check tank condition, hose integrity, and nozzle cleanliness
- Belt or roller drive — inspect drive belts and rollers for wear that causes case slipping
Common Issues
Problems to Watch For
- Tape not adhering properly due to worn pressure rollers or incorrect tape tension
- Uneven flap closure causing case instability on pallets
- Hot-melt glue stringing or dripping from worn nozzles
- Case size adjustment mechanism seized or difficult to adjust
Frequently asked questions
Should I choose tape or hot-melt glue sealing?
Tape sealing is simpler and lower cost for basic operations. Hot-melt glue provides a cleaner, more tamper-evident seal preferred by retailers. The choice often depends on customer requirements and production volume.
Can a case sealer handle different case sizes automatically?
Automatic case sealers with servo-driven adjustments can change between case sizes with minimal operator intervention. Manual-adjust models require physical adjustment of guides and rails for each size change.
What throughput should I expect from a used case sealer?
Standard case sealers handle 10-30 cases per minute. High-speed models can exceed 50 cases per minute. Match the sealer speed to your case packer output.