| Sleeve sealer | A machine that presents and seals film around a single product or grouped pack, normally before a shrink tunnel. |
| Sleeve wrapper | Common alternative term for a sleeve sealer or the wrapping section of the system. |
| PE film | Polyethylene shrink film used for many grouped, tray and transit packs. The exact grade, thickness and shrink behaviour must be confirmed with the film supplier and trial. |
| Seal bar or sealing jaw | The moving or heated assembly that joins and cuts the film to create the sleeve. The exact construction and adjustment depend on the machine. |
| Film overlap | The amount and position at which film layers meet around the pack before or during sealing. |
| Film width | The roll width selected to provide the required wrap around the actual bundle while remaining compatible with the wrapper path. |
| Collation | The arrangement of products into the required rows, layers or group before wrapping. |
| Bundle pattern | The defined quantity and orientation of products in the finished group, such as rows by columns and any layers. |
| Tray, pad and trayless | Three support approaches: a formed tray, a flat base pad or no separate base support. |
| Bullseye opening | The open area often visible at each side of a sleeve-wrapped pack after shrinking. The acceptable size depends on the pack requirement. |
| Shrink tunnel | A heated conveyor enclosure that applies controlled heat and airflow so the film recovers around the pack. |
| Dwell time | The time a pack spends in the effective heated zone, influenced by tunnel length and conveyor speed. |
| Airflow balance | The distribution and direction of heated air around the pack. It affects how evenly different faces shrink. |
| Pack spacing | The gap between packs entering and travelling through the tunnel. Spacing can influence airflow and heat loading. |
| Cooling | The period and supported travel after heating in which the film and pack stabilise before accumulation or handling. |
| Discharge | The conveyor and transfer route after the tunnel, including cooling, accumulation, inspection and handover downstream. |
| Pack integrity | The ability of the finished bundle to retain products and withstand the agreed transfer, lifting and handling route. |
| Changeover | The controlled adjustments, parts and verification needed to move from one approved format to another. |
| Sample trial | A test using representative products, support materials and film to determine settings and finished-pack suitability. |
| FAT | Factory acceptance testing against an agreed scope before equipment leaves the factory. |
| SAT | Site acceptance testing of the installed equipment and its site-dependent interfaces. |
| L-sealer | A different shrink-wrapping route that creates an L-shaped seal around a product in folded film, often for individual or fully enclosed packs. |
| Shrink-sleeve applicator | A machine that applies a decorative or tamper-evident sleeve to an individual container. It is not the same as a grouped-pack sleeve sealer. |
