The correct PE shrink film thickness for bottled water multipacks depends on bottle size, bundle configuration, and your shrink tunnel speed. For standard 500ml–550ml water bottles packed 6×4 (24 bottles), a 45–55μm LDPE shrink film typically works well. For 1.5L–2L bottles, use 70–100μm.
Why Thickness Matters More Than You Think
Too thin causes film breakage, uneven shrinkage, weak bundles, and line stoppages. Too thick wastes money and energy. The goal is the minimum thickness that runs reliably on your specific line.
Recommended Thickness by Application
| Application | Product Size | Bundle | Thickness |
|---|---|---|---|
| Small water bottles | 330–550ml | 6/12/24-pack | 40–55μm |
| Soft drinks / juice | 500ml–1L | 12/24-pack | 50–65μm |
| Large water bottles | 1.5L–2L | 6/12-pack | 70–100μm |
| Beer / soda cans | 330–500ml | 6/12/24-pack | 45–60μm |
| Glass bottles | 500–750ml | 6/12-pack | 80–120μm |
| Cartons / trays | Standard carton | Multi-bundle | 60–100μm |
| Industrial products | Machinery parts | Single bundle | 100–200μm |
5 Factors That Determine Your Exact Thickness
1. Bottle weight: Heavier bundles need thicker film. A 24-bottle pack weighs 12–13kg.
2. Bundle configuration: More bottles per bundle means more stress points at edges and corners.
3. Tunnel speed: Fast lines need film with predictable shrink at 150–180°C.
4. Transport distance: Export shipments need thicker film for rough handling.
5. Automatic vs manual: Automatic lines need ≤±5% thickness tolerance.
How to Test Before Bulk Ordering
Request samples of 2–3 thickness options, run them on your line at normal speed, and check for clean seals, even shrinkage, and tight bundles after cooling.
