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Which shrink film should you consider first?
For a clear retail overwrap around a rigid box or individual product, start by trialling a general-purpose POF shrink film. If that pack needs a different balance of toughness, sealing performance or shrink force, compare a suitable cross-linked POF grade. For shrink bundles and larger protective packs, include a purpose-made PE shrink film in the trial.
These are starting points, not rigid limits. POF also has bundling and heavy-product applications, while PE films differ in clarity, strength and printing options. The right choice is the grade that gives an acceptable pack on your equipment, at the required working pace.
POF, cross-linked and PE are not three separate resin families
Heat-shrink film describes a function: the film contracts under suitable heating conditions. POF means polyolefin. PE means polyethylene, which is itself part of the polyolefin family. In packaging quotations, however, POF commonly refers to fine shrink films used for display packaging, while PE shrink film is often listed separately for bundling or protective applications.
Cross-linking is a material treatment, not a third resin family. In this guide, “cross-linked film” means cross-linked POF shrink film. Ask a supplier using that description to identify the actual film grade and construction. Do not assume that the words POF, five-layer or cross-linked fully specify its performance.
| Film | Trial starting point | What to verify |
|---|---|---|
| Standard POF | Clear retail overwrap around suitable rigid products | Appearance, sealing, handling and pack fit |
| Cross-linked POF | A defined need for toughness, sealing performance or particular shrink behaviour | The specific grade; low force is not universal |
| PE shrink film | Bundles and protective packs | Load stability, pack support, seal and tunnel compatibility |
Watch: sealing and shrink wrapping an egg tray
Standard POF: a useful starting point for retail packs
Consider a general-purpose POF film when presentation matters: a clear view of the product, a neat seal and a closely fitted overwrap. Trial examples might include rigid cartons, stationery, books or grouped retail items. The product still needs to tolerate the packaging process.
During the trial, look at the whole pack. Is the print easy to see? Are the corners acceptable? Does the film remain intact after normal handling? Does the seal stay closed after shrinking? Avoid rejecting a film solely because the first tunnel setting produces wrinkles; check film size, air release and equipment setup as well.
Cross-linked POF: select the property you actually need
Cross-linked POF grades can offer combinations of toughness, seal strength and an operating window suited to demanding applications. Some grades are designed for low shrink force, others for different packaging priorities. Cross-linked does not automatically mean the highest shrink force or the best choice for every product.
For a light tray, thin carton or flexible item, ask specifically about low-force shrink behaviour. A tight-looking pack is not a success if the product bends. For an irregular product, assess puncture resistance and the corners during handling. For faster production, demonstrate sealing and shrinking at the proposed running speed.
Pay for a measured improvement. Compare the candidate grade with your current film using the same product and agreed acceptance criteria. Do not assume that a more expensive cross-linked film allows a thinner gauge without a packaging trial.
PE shrink film: evaluate bundle stability and protection
PE shrink film is an important option for grouped packs and protective packaging. Typical trial candidates include beverage or canned-goods multipacks, cartons and larger items. Ask whether the proposed pack uses a sleeve, a fully enclosed wrap or another arrangement; the intended openings and support change what the film must do.
Assess how the bundle behaves when lifted, transferred and transported. Check pack movement, seal integrity and any tray or support needed. Specify the clarity and print visibility you require rather than assuming that every PE grade has the same appearance.
If you already own a POF sealing machine, do not assume it can run the proposed PE film. Confirm the exact film construction, thickness, sealing system and tunnel capability. A change of film category can require more than a temperature adjustment.
How do you choose shrink-film thickness?
Start with a sample recommendation for your product, then compare it with the next practical candidate thickness. Product weight alone is not enough: corners, shape, support, handling and the sealing process all affect the result.
Request thickness in micrometres (µm). If a quotation uses gauge, ask the supplier to state the equivalent thickness and its tolerance. Also confirm film width, usable length and roll format; two rolls with the same outside diameter are not necessarily equivalent purchases.
A thicker film may be a useful candidate for a demanding pack, but thickness alone does not guarantee better protection. Likewise, a thinner high-performance film should only replace the current specification after seals, handling and the finished pack have passed the agreed checks. Avoid a universal chart that assigns one thickness to every product of the same weight.
Match the roll to the sealer and shrink tunnel
Confirm whether your sealer uses centre-folded film, single-wound film, tubing or pre-made bags. Check reel width, core, maximum roll size, unwind direction and any perforation requirement against the machine instructions. A material that shrinks well can still be the wrong roll format for your line.
Sealing and shrinking are separate parts of the process. Establish a sound seal before trying to optimise the tunnel finish. For the tunnel, review temperature, conveyor speed, airflow, pack spacing and how the product is supported.
Shrink percentage and shrink force are different properties. A film can contract substantially without exerting the same force as another grade. Request shrink data under stated test conditions, including machine and transverse directions where relevant. Start from supplier guidance and trial the real product; a tunnel setpoint is not the actual temperature reached by the film.
What should you check when the pack looks wrong?
Wrinkles or loose film: inspect the film or bag size, the route for trapped air to escape, heat distribution and dwell time. Do not immediately assume a thicker film is needed.
A seal that opens: check whether the seal is sound before the pack enters the tunnel. Review contamination, alignment and the film-specific sealing conditions with the equipment supplier.
Holes or splits: record whether the damage starts at a product corner, a seal or another point. Review sharp edges, film tension, heat exposure and the selected grade instead of increasing heat by default.
A bent tray or crushed carton: review product support, wrapping tension and the film's shrink force. Include a suitable low-force grade in the comparison if distortion is the limiting issue.
These checks help organise a trial; they do not replace the equipment instructions. Change settings systematically and record the result.
Compare cost per accepted pack, not price per roll
Run each candidate with representative products and the intended machine. Include the difficult size or shape, not only the easiest item. Record the grade, thickness, width, settings, running time, completed packs, rejects and interruptions. Assess appearance after cooling and check the handling conditions the package will actually face.
A simple trial calculation is film cost consumed ÷ accepted packs. For example, a trial consuming 30 currency units of film and producing 1,000 accepted packs has a film cost of 0.03 per accepted pack. This is an illustrative calculation, not a film quotation. Add labour, energy, rework and other relevant costs when comparing the total process.
For food-contact use, obtain documentation for the specific grade and intended contact conditions. For recycling claims, confirm the exact material and the collection rules in the destination market. Neither food suitability nor recyclability follows automatically from the word POF or PE.
Common questions
Is cross-linked POF always better than standard POF?
No. It is worth comparing when a particular grade addresses a defined problem. A standard film that already meets the pack requirements may remain the appropriate choice.
Can PE and POF run on the same shrink machine?
Possibly, but only if the particular machine, film grade, thickness and roll format are compatible. Verify the sealing system and tunnel rather than relying on a generic film label.
What shrinking temperature should I use?
There is no single setting for all POF or PE films. Use grade-specific guidance and establish the result on the actual tunnel, conveyor speed and product.
Is PE shrink film the same as stretch wrap?
No. A PE shrink grade is intended for a heat-shrink process. Stretch wrap is applied under stretch; it should not be substituted merely because the resin family sounds similar.
Prepare a film-and-machine trial brief
Send RUIKE the product dimensions, weight, photos and any sharp, soft or heat-sensitive features. Explain whether you need a single-item retail wrap, a multipack or a protective pack, and show the intended finished result.
Include your existing film label or technical sheet, thickness, roll width and format; the sealer and tunnel model; current settings and output target; and photos of any defects. State food-contact or destination-market requirements where applicable.
With that information, film selection and equipment selection can be discussed together. A sample run should establish which combination meets your packaging requirements before you commit to a production specification.