| Types | Shrink wrap, wrap-around carton, carton packing, tray |
| Rate | Matched to the filler; usually the line bottleneck |
| Key control | Film tension, seal temperature, case squareness |
| Contact material | 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.
A filler is rated on bottles per hour at a steady state; a packer is rated on cases per hour including film roll changes, seal cooling and pattern changes. Buyers compare the filler rating and forget that a packer rated below it sets the line rating for the whole shift.
| 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 |
Throughput and change-part lists are on the Wrap-round Film Shrink Wrapping page rather than in this note.
Film tension and seal temperature. A pack that is tight on the line but loose after cooling has been sealed too cold; a pack with a torn corner has been sealed too hot or cooled too fast. Both show up as returns, not as line stops, which is why they are easy to miss at commissioning.
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 same question is worked through from another angle in How Palletizers Improve Packaging Efficiency.
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: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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