Shrink Film vs Stretch Film: Which to Use, Materials, Gauges and Equipment
Shrink film contracts with heat; stretch film holds by elastic tension. Here is how each works, POF vs PVC vs PE shrink against LLDPE stretch, gauge ranges, the equipment each needs and a use-case table.
Short answer
Shrink film is applied loosely and heated so it contracts tightly around the product; stretch film is elongated as it is applied and holds by elastic tension. Use shrink film (POF, PVC or PE, 12–200 micron) for retail multipacks, tamper evidence and long storage; use stretch film (LLDPE, 12–30 micron) for unitising pallets. Shrink needs a heat tunnel or gun; stretch needs only a dispenser or wrapper.
Key takeaways
- Shrink film holds by having physically contracted under heat (typically 40–70% biaxial shrink for POF); stretch film holds by elastic recovery after 10–300% elongation.
- Shrink films: POF 12–25 micron for retail packs, PVC 20–30 micron for boxes and stationery, PE shrink 40–200 micron for collation and pallet hoods; stretch film is cast or blown LLDPE at 12–30 micron.
- Shrink tunnels run at about 130–170 °C for POF and 180–220 °C for PE and consume 3–10 kW; a stretch wrapper needs no heat and a hand dispenser needs no power at all.
- Stretch film creeps and can loosen over weeks in storage; shrink film has no tension to lose, so long-stored bundles and retail packs favour shrink.
- For pallet unitising, stretch film costs less per pallet, needs no tunnel and can be removed and reapplied; shrink hoods are used only for weather-exposed or very long-stored loads.
Shrink film and stretch film do opposite things to hold a product. Shrink film is applied loosely around the item, then heated so it contracts and grips; stretch film is pulled tight as it is applied and grips because it is trying to recover its original length. Use shrink film for retail packs, multipacks, tamper evidence, bundling and anything that will sit in storage for months. Use stretch film for holding cartons on a pallet through a journey. When someone asks which to use for a pallet, the answer is nearly always stretch; when they ask which to use for a six-pack of bottles or a boxed product on a shelf, the answer is nearly always shrink.
The confusion arises because both are clear polyethylene-family films on a roll, and Indian trade language often calls both "wrapping film". This article separates them by mechanism, material, gauge, equipment and cost, and finishes with a use-case table you can specify from.
Mechanism: heat contraction versus elastic tension
Shrink film is manufactured by stretching the film in one or both directions while it is warm and then cooling it in the stretched state, which locks the polymer chains in tension. When the film is later heated past its softening point, typically 100–150 °C at the film surface, the chains relax and the film contracts towards its original dimensions. A biaxially oriented polyolefin (POF) film shrinks 40–70% in each direction; PVC shrinks 40–60%; PE shrink films shrink less, often 40–60% in the machine direction and 15–30% in the transverse direction. The product is enclosed loosely in a bag or a sleeve, sealed, and passed through a tunnel; the film shrinks onto the product and stays there because it has physically become smaller. There is no residual tension to lose.
Stretch film is linear low-density polyethylene (LLDPE) made with a very high elongation at break, well over 400%. It is applied by pulling it against the load at 10–20% by hand or 200–300% through a machine's pre-stretch rollers, and it holds because it is continuously trying to recover. That recovery force is what pulls a pallet of cartons into one block. The weakness is creep: over days and weeks the tension slowly relaxes, which is why a hand-wrapped pallet that felt tight on Monday can be loose by the end of the month. The shrink film and stretch film glossary entries give the short definitions.
Materials and gauges
Each film family has a gauge band and an application band. The table lists the ones you will meet in Indian packaging.
| Film | Family | Typical gauge | Shrink or stretch behaviour | Main uses | Notes for India |
|---|---|---|---|---|---|
| POF (polyolefin) shrink | Shrink | 12, 15, 19, 25 micron | 40–70% biaxial shrink at 130–170 °C tunnel | Retail packs, boxed goods, multipacks, pharma cartons, food | Clear, strong, low odour; cross-linked grades for high-speed and food lines |
| PVC shrink | Shrink | 20–30 micron | 40–60% shrink at 110–140 °C | Boxes, stationery, software, low-speed lines | Cheap and shrinks at low heat, but brittle in cold, gives off chloride fumes, and is being phased out under EPR and buyer policies |
| PE shrink (LDPE/LLDPE blends) | Shrink | 40–80 micron collation; 100–200 micron pallet hoods | 40–60% MD, 15–30% TD at 180–220 °C | Collation of bottles and cans, bricks, water pouches, pallet shrink hoods | Strongest and heaviest; printed collation film is common for beverages |
| Cast LLDPE stretch | Stretch | 12–30 micron (we make 17–30) | Elongation 10–20% hand, 200–300% machine | Pallet unitising, bundling, dust and rain cover on loads | Consistent gauge, clear, quiet unwind; sold by net weight |
| Blown LLDPE stretch | Stretch | 17–35 micron | Elongation as cast; higher puncture resistance | Sharp, heavy or unstable pallet loads | Tougher but hazier and noisier; often chosen for bare metal and timber |
| Pre-stretched hand film | Stretch | 7–12 micron (already oriented) | Applied with 5–10% further stretch | Hand wrapping at machine-like film yield | Light rolls, less operator fatigue; dearer per kg, cheaper per pallet |
A note on gauge selection for shrink: the film must survive the product's edges after it has shrunk, when it is thinner and under stress at the corners. Boxed products with sharp corners generally need 19 micron POF or more; a single soft item can go down to 12 micron. For stretch, gauge is chosen for puncture resistance against the load, and holding force comes mainly from pre-stretch and the number of turns rather than from thickness, which is set out in the pre-stretch entry.
Equipment and energy
This is the practical divider for many small and mid-sized plants. Shrink film needs heat; stretch film does not.
- Shrink, manual: an L-bar sealer and a hand-held heat gun. Fine for a few hundred packs a day and for oversized items. Finish quality depends entirely on the operator.
- Shrink, semi-automatic: L-sealer feeding a shrink tunnel. Tunnels for POF run at about 130–170 °C and draw 3–10 kW depending on width and belt speed; throughput is 300–1,500 packs per hour.
- Shrink, automatic: side sealer or sleeve wrapper with tunnel, 1,000–6,000 packs per hour, used on beverage and FMCG lines for collation packs.
- Pallet shrink hood: a gusseted PE hood dropped over the pallet and shrunk with a gas-fired ring or a hooding machine. Heavy film, high energy, but the load is sealed top to bottom against weather.
- Stretch, hand: a dispenser with a brake. Zero energy. Film yield is limited by what an operator can pull, 10–20%.
- Stretch, machine: a turntable or rotary-arm wrapper with a powered pre-stretch carriage at 200–300%. A single-phase machine draws 1–2 kW, wraps 20–40 pallets per hour, and cuts film per pallet by 60–75% against hand wrapping.
If a plant has no tunnel, stretch film handles every unitising job and most bundling. If a plant sells into retail, some form of shrink is unavoidable, and the question becomes which shrink material and gauge rather than shrink versus stretch.
Use-case table: which film for which job
| Job | Use | Suggested specification | Why |
|---|---|---|---|
| Pallet of cartons, domestic road | Stretch | 20 micron cast, 500 mm, 200–250% machine or hand with 3 top and bottom turns | Cheapest per pallet, removable, no heat |
| Pallet of cartons, export container | Stretch | 23 micron cast or blown, corner boards, film anchored to pallet | Puncture resistance over 15–25 days of vibration |
| Pallet stored outdoors or 3+ months | Shrink hood (or stretch plus top sheet) | 100–150 micron PE hood | Sealed against rain; no creep over long storage |
| Retail boxed product, single unit | Shrink | 15–19 micron POF, L-sealer plus tunnel | Tamper evidence, clean finish, dust seal |
| Multipack of 6–12 bottles or cans | Shrink | 40–70 micron printed PE collation film on tray or pad | Carries the pack weight; printable; standard in beverages |
| Bundling pipes, profiles, timber | Stretch (bundling film) | Narrow 100–150 mm stretch film, or PE shrink sleeve for retail bundles | Stretch bundling is fast and needs no heat |
| Pharma secondary carton | Shrink | 12–15 micron POF, cross-linked grade on fast lines | Low odour, clear, tamper evident, tears cleanly |
| Machinery part on skid, bare metal | Stretch | 25–30 micron blown, VCI film beneath if ferrous | Sharp edges puncture thin film; stretch is removable for inspection |
| Returnable crates in a closed loop | Stretch or strapping | 17 micron at 250% machine, or PET strap | Film is removed at every trip; minimise grams per trip |
The rows where buyers most often choose wrongly are the last of each group. Shrink hooding a pallet that only crosses Gujarat by road is paying for a tunnel to solve a problem stretch film solves for a fraction of the film. Stretch-wrapping a retail multipack gives a product that looks second-hand on the shelf and cannot be sealed. The FMCG and food packaging page sets out where each film sits in the primary, secondary and tertiary layers of a typical Indian consumer-goods line.
Cost logic: film, energy and time
Film prices move with polymer, so compare on quantities rather than on quotes. For a pallet of standard cartons, a machine stretch wrap uses about 120–160 g of 17–20 micron film and no heat; a hand wrap uses 400–500 g; a shrink hood uses a 100–150 micron bag of roughly 1.5–2 kg plus gas or electricity to shrink it. The hood costs several times the stretch wrap per pallet and is justified only where the load will stand in the open or in storage long enough for stretch film to creep.
For a retail pack the comparison is between shrink materials. POF at 15 micron weighs 13.8 g/m² (micron × 0.92, the same density arithmetic as polyethylene stretch film); PVC at 25 micron weighs about 33 g/m² because PVC is denser at about 1.35 g/cm³. A move from 25 micron PVC to 15 micron POF often cuts film weight per pack by more than half, removes the chloride fumes from the tunnel area and simplifies EPR reporting, which is why most Indian FMCG lines have already made it and why we would not recommend PVC for a new line. Cost per pack should always be worked out as film weight per pack × rate per kg, plus tunnel energy per pack, plus the reject rate from bad seals.
How to specify: checklist for shrink and for stretch
For shrink film, give the supplier:
- Product dimensions and weight, and whether the corners are sharp.
- Format: single-wound sheet, centre-folded film for an L-sealer, or tubing for a sleeve wrapper.
- Material (POF, cross-linked POF, PE) and gauge; state that PVC is excluded if your buyer's policy or your EPR plan requires it.
- Machine: sealer type, tunnel width and temperature range, line speed in packs per hour.
- Shrink ratio required, especially for irregular products that need high transverse shrink.
- Print: none, or flexo printed collation film with the repeat length.
- Food contact: certify the grade if the film touches food.
For stretch film, give:
- Hand or machine, and the machine's pre-stretch capability.
- Gauge in micron and film weight in g/m²; ask for rolls sold on net film weight.
- Width (500 mm standard), core (76 mm), net weight per roll.
- Load description: carton, crate or bare product; weight and height; edge sharpness.
- Journey and storage duration under wrap.
- Cling: single-side standard; double-side only if you want pallets to grip each other.
- Colour: clear for inspection, black or opaque for pilferage or UV concerns.
Where we fit in
We manufacture cast LLDPE stretch film in 17, 20, 23, 25 and 30 micron, hand and machine grade, in widths from 250 to 750 mm, and sell it on net film weight. We do not make shrink film, and where a job genuinely calls for a shrink pack we will say so rather than sell you stretch film for it. Send us your pallet dimensions, load weight and the wrapper you use, and we will specify gauge and pre-stretch and quote per kilogram against your current grams per pallet. The stretch wrap film product page lists every gauge with its g/m², and the stretch film manufacturers in India page covers dispatch lanes from Rajkot.
Frequently asked questions
What is shrink film?
Shrink film is a plastic film, usually polyolefin (POF), PVC or polyethylene, that has been stretched and oriented during manufacture and stored in that state. When it is heated above its softening point it tries to return to its original size, contracting by 40–70% and pulling tight around whatever it encloses. It is used for retail multipacks, tamper-evident wraps, bundling and pallet shrink hoods.
Can I use stretch film instead of shrink film?
For pallets and bundles that only need holding together in transit, yes, and stretch film will usually be cheaper and need no heat. For retail packs, tamper evidence, a tight sealed skin around a single product, or anything stored for months, no: stretch film creeps and loosens, cannot be sealed shut and does not give a clean finish. Choose by what the wrap must do, not by which roll is on hand.
Which is cheaper, shrink or stretch film?
Per pallet, stretch film is cheaper because it uses 100–500 g of film and no energy; a pallet shrink hood is 100–200 micron PE and needs a gas or electric shrink frame. Per retail pack, shrink is the only option, and thin 12–15 micron POF is economical. Count the tunnel energy and the operator time in the comparison, not only the film.
What gauge shrink film should I use?
For light retail packs and multipacks, 12–15 micron POF; for boxes, books and stationery, 15–19 micron POF or 20–25 micron PVC; for collation bundles of bottles or cans, 40–80 micron PE shrink; for pallet shrink hoods, 100–200 micron PE. Heavier and sharper products go up a gauge; a good rule is the thinnest film that survives your own drop test on the packed product.
What equipment do I need for shrink film?
At its simplest, an L-sealer to close the film around the product and a heat gun or hood to shrink it, which is fine for a few hundred packs a day. Production lines use an L-sealer or side sealer feeding a heat tunnel at 130–170 °C for POF. Pallet shrink hoods need a gas-fired or electric shrink frame. Stretch film needs only a hand dispenser or a turntable wrapper and no heat.
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