Polythene Packaging for Profiles and Extrusions: 7 Specification Checks
Long products create packaging problems that ordinary bags do not. PVC trunking, aluminium profiles, conduit, trims and mouldings can be difficult to handle, vulnerable to scratching and awkward to protect consistently when lengths or bundle sizes change.
The right polythene specification needs to do more than fit around the product. It should be practical to load, strong enough for the real handling hazards and presented in a format that works at the packing station. These seven checks provide a useful starting point for specifying polythene packaging for profiles and extrusions.
1. Measure the packed bundle, not one profile
Start with the product as it will actually be packed. Record the finished bundle width, depth and length, including any spacers, end caps, protective paper or strapping beneath the polythene.
A nominal profile dimension is rarely enough. Nested products can settle into a different shape, while mixed bundles or varying counts can change the cross-section. Allow enough circumference for the sleeve to load without excessive force, but avoid unnecessary surplus film that makes folding and sealing untidy.
It also helps to note the full length range. If orders regularly change from short cut pieces to long standard lengths, that variation may determine whether a continuous tube or a pre-made bag is the more useful format.
2. Choose the right polythene format
There are three common starting points:
Lay-flat tubing is supplied continuously on a reel. Operators cut the required length and seal or close one or both ends, making it useful when product lengths vary.
Pre-made sleeves or bags can improve repeatability when bundle dimensions and packing volumes are consistent.
Single-wound sheeting provides a flat web for wrapping, covering or interleaving where a fully enclosed sleeve is not required.
There is no universal best option. The practical choice depends on order mix, available sealing equipment, packing speed, storage space and the amount of operator handling involved.
Stretchband Packaging manufactures bespoke lay-flat tubing, single-wound sheeting and other polythene film formats for manual and automated applications.
3. Match thickness to the real handling hazards
Film thickness should be based on the complete journey rather than the packed weight alone. Long profiles may be dragged across benches, moved on trolleys, stacked against other bundles or exposed to concentrated pressure at cut ends and corners.
Map the points where damage actually occurs. A sharper end may need an end cap or local protection rather than simply increasing the gauge across the whole pack. Conversely, a sleeve that survives loading but tears during storage or delivery is not doing its job.
A controlled trial should check loading, closure, stacking and transport-style handling. This is more reliable than selecting a thickness from a generic chart.
4. Consider the product surface and the film's slip
Gloss-painted, anodised, powder-coated and decorative surfaces may need a different approach from unfinished industrial profiles. The film should be assessed against the actual finish, including any protective tape already applied to the product.
Slip characteristics matter too. Too much friction can make a long bundle difficult to insert; too little can make completed packs awkward to stack and handle. Dust attraction and static may also be relevant in clean production areas or around lightweight plastic components.
Provide samples of the finished product when possible. A short packing trial can reveal scuffing, blocking or handling issues that are difficult to predict from dimensions alone.
5. Decide how the ends will be protected and closed
The closure method affects both film length and daily packing time. Options may include heat sealing, taping, folding, tying or using end caps before the outer sleeve is closed.
Ask what the closure is expected to achieve. Is the pack mainly protecting against dust and handling marks, or does it need a more complete barrier during storage and distribution? Also consider how the customer will open it. A closure that is secure in transit should not force the recipient to cut dangerously close to a finished surface.
If heat sealing is used, share the sealer type, seal width and normal operating routine so the film can be tested under representative conditions.
6. Use print and colour to improve identification
Printed polythene is not only about branding. A repeated product name, handling message, batch panel or opening instruction can help operators and customers identify long, similar-looking bundles.
For effective print, agree the repeat length, number of colours, viewing direction and any clear area needed for labels. The artwork should also account for the way a flat tube opens around a three-dimensional bundle; important information must remain visible rather than disappearing underneath the pack.
Stretchband Packaging supplies bespoke printed polythene films, including printed lay-flat tubing and other packaging formats.
7. Specify the reel and packing-station details
A suitable film can still create problems if the reel is too heavy, too large for the dispenser or wound in the wrong presentation. Confirm core size, maximum reel diameter, reel width, preferred weight and unwind direction where these affect the process.
Look at the complete packing station. Operators need enough clear bench length, safe reel handling and a repeatable way to cut and close the film. For higher volumes, record expected packs per hour and test the proposed film at normal working speed rather than only making one sample pack.
Recycled content: test the finished specification
Recycled-content polythene may be suitable for many secondary and industrial packaging applications, but performance should be checked against the product finish, puncture points, sealing method and visual requirements. Stretchband Packaging can manufacture recycled and PCR polythene films in several formats.
UK Plastic Packaging Tax generally applies to finished plastic packaging components containing less than 30% recycled plastic, subject to the detailed rules, exemptions and registration thresholds. The rate is £228.82 per tonne for relevant components manufactured in or imported into the UK from 1 April 2026. Packaging responsibility depends on the circumstances, so businesses should check the current HMRC guidance rather than treating recycled content as a specification decision in isolation.
A practical trial checklist
Before approving a new sleeve, tube or sheet, test:
loading over the largest and smallest normal bundles;
film behaviour around cut ends, corners and strapping;
closure quality using the actual sealer, tape or fold;
surface appearance after realistic handling;
stack stability and label or print visibility;
reel handling, cutting and operator reach; and
film use per accepted pack, not only the price per kilogram.
Talk through the application
The most useful starting information is simple: product or bundle dimensions, length range, pack quantity, surface finish, current film, closure method and the handling problem you want to prevent.
Stretchband Packaging can review those details and recommend a practical polythene format for a controlled trial. There is no obligation to change an existing specification if the current solution is already the right one.
