Polyolefin vs Polythene Shrink Film: 7 Differences That Matter
Polyolefin and polythene shrink film can both create secure, professional packs, but they are not interchangeable by default. The correct choice depends on the product, the purpose of the pack, the wrapping equipment and the result required after shrinking.
For a small retail product, presentation and clarity may be the priority. For a heavy beverage multipack, the film may need to hold several units together through handling and distribution. Choosing by material name or price per kilogram alone misses these differences.
This guide explains the practical points to compare before specifying polyolefin or polythene shrink film.
The short answer: when is each film normally used?
Polyolefin shrink film, commonly shortened to POF, is often selected for high-clarity presentation packs around individual products or smaller grouped items. Stretchband Packaging supplies POF in 12–30 micron options for manual, semi-automatic and high-speed shrink-wrapping equipment.
Polythene shrink film, usually based on LDPE, is widely used for stronger collation and transit packs. Typical applications include grouped bottles, cans, jars, cartons and heavier industrial products. It can also be manufactured to bespoke widths, thicknesses, colours and print requirements.
That is a useful starting point, not a final specification. The product, pack pattern and machine still need to be tested together.
1. Clarity and shelf presentation
POF is normally the stronger candidate where shoppers need to see the product clearly. It can create a tight, glossy pack with neat presentation around boxes, trays and irregular retail items.
LDPE shrink film can also be made clear, but its primary job is often load containment rather than an almost invisible retail finish. On a bottle or can multipack, a slightly heavier film may be a sensible trade-off for handling strength.
Ask a simple question: is the shrink wrap mainly selling the product, protecting it, or holding several products together? The answer quickly narrows the choice.
2. Product weight and pack format
The total pack weight matters more than the weight of one item.
A light carton wrapped individually creates a very different load from 12 or 24 bottles moving through a shrink tunnel. For grouped products, the film must work with the pack pattern, unsupported gaps, sharp corners, handling points and expected distribution route.
Polythene collation shrink film is commonly specified where the wrap contributes to multipack stability. POF is generally more relevant to lighter presentation packs, although the final decision must be based on a production trial rather than a broad material rule.
3. Shrink behaviour and finished appearance
Good shrink performance is not simply a matter of applying more heat. Film formulation, thickness, orientation, tunnel temperature, airflow and conveyor speed all influence the result.
Common symptoms of a mismatched specification include:
loose areas or wrinkles after the tunnel
distorted cartons or heat-sensitive products
weak seals
holes around corners
excessive film tails or untidy end seals
packs sticking together after shrinking
Changing film without recording the existing machine settings can hide the real cause. Before a trial, note sealing temperature, dwell time, tunnel temperature, conveyor speed, airflow and the condition of sealing components.
4. Thickness and material use
POF is often used at relatively low micron because the film is engineered for strong, clear presentation in lighter applications. Stretchband Packaging's current POF range covers 12–30 micron.
LDPE shrink film specifications vary more widely because the applications range from lightweight cartons to heavy industrial multipacks. The right gauge should be determined by pack weight, puncture risk, unsupported spans, required shrink force and line performance.
The thickest film is not automatically the safest choice. An oversized gauge can increase material consumption, alter shrink behaviour and add unnecessary cost. Equally, reducing micron without a controlled trial can create failures that cost more than the material saving.
5. Machinery and reel presentation
The film must match the way the machine receives, seals and shrinks it.
Important details include:
centre-folded or single-wound presentation
reel width and outside diameter
core diameter and core condition
winding direction
maximum reel weight
perforation requirements
seal-bar design
tunnel temperature range and airflow
line speed and product spacing
A film can look suitable on a specification sheet and still track badly, seal inconsistently or create excessive changeovers if the reel presentation is wrong. Supplying the machine make, model and current reel label at the start of an enquiry prevents avoidable assumptions.
6. Food-contact and compliance requirements
Do not assume that every film made from the same polymer has the same approval status.
If the film will come into direct contact with food, specify the food type, contact conditions, temperature and duration. Request the relevant declaration or supporting documentation for the exact grade supplied. UK government guidance makes clear that food-contact packaging must meet the applicable safety requirements; suitability should therefore be confirmed for the real application, not inferred from the words “POF” or “LDPE”.
For non-food products, other requirements may still matter, including recycled content, print, colour, opacity, anti-static performance or traceability.
7. Cost per accepted pack, not price per reel
Comparing reel prices alone can reward the wrong specification.
A more useful comparison includes:
metres and usable packs per reel
film weight per accepted pack
rejected packs and rework
start-up and changeover waste
reel-change frequency
sealing-component wear
line speed and stoppages
damage during packing and distribution
A higher-performing film may cost more per kilogram but less per accepted pack. The reverse is also possible. A short, measured production trial gives a better answer than a desk comparison based only on gauge and unit price.
A practical selection checklist
Before requesting a recommendation, gather:
product dimensions and maximum packed weight
individual pack or grouped multipack format
photographs of the unwrapped product and current finished pack
machine make, model and sealing method
current film width, gauge and reel details
typical line speed
presentation, strength and compliance priorities
annual usage and delivery pattern
This information lets a supplier recommend a realistic starting specification and plan a useful trial.
Choose the film through a controlled line trial
The most reliable way to choose between polyolefin and polythene shrink film is to test the proposed specification under normal production conditions. Keep the product pattern consistent, record machine settings, measure waste and inspect packs after cooling and handling.
At Stretchband Packaging, we can review the current film, machinery and finished-pack requirements before recommending a sample. The objective is not to force one polymer into every application; it is to find the film and reel specification that gives a repeatable pack at a sensible total cost.
To discuss a POF presentation pack, an LDPE collation pack or a current shrink-wrapping problem, contact Stretchband Packaging. There is no obligation to change specification or supplier.
