| Types | Shrink wrap, wrap-around carton, carton packing, tray |
| Throughput | Matched to the filler; usually the line bottleneck |
| Key control | Film tension, seal temperature, case squareness |
| Wetted parts | PE film, corrugated board, tray board |
| Key decision | Shrink, carton or tray |
| Line position | After labelling, before palletizing |
Shrink wrap is the cheapest per case and the fastest, and it suits retail where the pack is the display unit. A wrap-around carton gives print area and stack strength for distribution. A tray with shrink is a compromise used where the pack needs both protection and visibility.
When the market needs print on the case, when the pack has to stack high in a warehouse, or when the product is sold through distribution rather than direct to retail. A carton costs more per case, and it protects the bottles and carries the brand where shrink film cannot.
| Pack format | Cost per case | What it protects |
|---|---|---|
| Shrink wrap | Lowest | Retail display, short distribution |
| Tray + shrink | Middle | Stacking and visibility |
| Wrap-around carton | Higher | Print area and long distribution |
| Regular slotted carton | Highest board use | Fragile packs and export |
The specification sheet for the Carton Packing carries the figures quoted here.
From the pack footprint plus the wrap allowance and the tunnel shrinkage. A film that is too narrow leaves the base exposed; too wide and the pack gets a double layer at the seam. Width is a per-format setting, like the lane guides.
The unit behind this configuration is the Wrap-round Carton Packer.
In cases per hour, at the same format, with margin for film changes and seal cooling. A packer rated below the filler sets the line rating, and the shortfall appears as bottles accumulating before the packer rather than as a machine fault.
The same question is worked through from another angle in Packaging Machines for Finished Bottles: Case Packers and Shrink.
It reaches the pallet, the film width and the truck. A pattern that does not fit the pallet footprint wastes cube, and a pattern that does not match the retail unit costs the customer a repack. Pattern is a commercial decision as much as an engineering one.
It follows the pack weight and the transport distance, and it is set with the film supplier. A thinner film saves cost per pack and fails earlier in a long distribution chain.
It is rated in packs or cases per hour and must exceed the filler output in cases. The limiting factor is normally the tunnel dwell time, not the wrapping speed.
Too much heat, too little tension, or a film that is too thin for the pack weight. A pack that sags after cooling was sealed outside its window.
Not without a change of the packing module. Shrink and wrap-around carton are different machines with different board or film paths, so a plant running both normally has two packers.
The pattern that fits the pallet footprint and the retail unit. It is decided with the palletizer and the film width at the same time, because changing it later changes three machines.
Country: Maldives
Product: PET Bottled Mineralized Water
Capacity: 24,000BPH (500ml); 2 Lines
Solution:Water Production Line
Country:Kazakhstan
Product: PET Bottled Sparkling Water, Canned Soft Drink, Canned Tea
Capacity: 25000CPH (250ml)
Solution:Three Lines,7000BPH(1.5L), 15000CPH(330ml),15000CPH(450ml)
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