By Luis Lopez, AI transportation consultant, CEO of Go Hub.io Holdings Corp and subsidiaries, and host of the Freight Guru Podcast
Stretch wrap is the clear plastic film wound around a pallet to hold the cartons together. It costs very little per pallet and gets very little attention, which is exactly why it causes so many problems. A pallet that leaves the dock with poor wrapping can arrive leaning, collapsed or missing cartons, and the shipper often ends up holding the claim.
This guide covers what stretch wrap actually does, the main types of film, how to wrap a pallet properly and the mistakes that lead to damaged freight.
What stretch wrap is supposed to do
Wrap has three jobs:
- Unitize the load. It turns a stack of separate cartons into a single unit that moves together.
- Tie the load to the pallet. Good wrapping holds the cartons onto the pallet itself, so the load cannot slide off.
- Protect against dust, moisture and tampering. Wrap is not waterproof packaging, but it helps keep dirt out and makes tampering more visible.
The key idea is containment force: how tightly the film holds the load. Containment force depends on how much the film is stretched, how many layers are applied and how strong the film is. A pallet with lots of loosely applied film can have less holding power than one with fewer, properly stretched layers.
Types of stretch film
Cast film
Cast film is clear, quiet as it unwinds and clings well. It is widely used for machine wrapping and general freight.
Blown film
Blown film is usually tougher and more puncture-resistant than cast film, which can make it a better choice for loads with sharp corners or irregular shapes.
Pre-stretched film
Pre-stretched film has been stretched during manufacturing, so it is easier to apply by hand and uses less material. It is popular for manual wrapping where workers cannot stretch film consistently.
Hand wrap vs. machine wrap
Hand wrapping depends on the worker. Machine wrapping, using turntable or rotary-arm wrappers, applies film with consistent tension and overlap. Machines with powered pre-stretch can stretch film significantly before it reaches the load, which improves containment and reduces film use. For high-volume shippers, a wrapping machine is often one of the best damage-prevention investments they can make.
How to wrap a pallet properly
- Build a good pallet first. Wrap cannot fix a bad stack. Cartons should be square, stacked within the pallet edges and interlocked where possible. My guide to pallet types covers the base itself.
- Start at the bottom and tie into the pallet. Begin by wrapping around the pallet deck several times so the film locks the load to the pallet, not just to itself.
- Work upward with overlap. Each pass should overlap the previous one. Gaps in coverage are weak points.
- Add extra wraps at the top and bottom. The base and the top layer take the most stress during handling.
- Keep tension consistent. Loose film does little. Film stretched so hard it tears or crushes cartons is also a problem.
- Finish cleanly. Tuck or seal the tail so it does not catch on equipment and unravel.
- Consider a top sheet. A cap sheet or top-wrap helps keep dust and moisture off the top layer.
Common wrapping mistakes
- Not tying the load to the pallet. This is the most common error. The load wraps into a nice cube that slides right off the pallet in transit.
- Too few wraps on heavy loads. Heavy, dense freight needs more containment than light cartons.
- Wrapping over overhang. Cartons hanging past the pallet edge get crushed and torn, and wrap does not prevent it.
- Using wrap instead of banding or straps. Some loads, like heavy drums, steel or bagged goods, may need straps or banding in addition to film.
- Covering labels. Wrapping over shipping labels makes them hard to scan. Apply labels so they stay readable, a topic covered in freight pallet labels explained.
- Relying on wrap to hold freight in the trailer. Wrap holds cartons to a pallet. Load bars, straps and airbags hold pallets in the trailer. They solve different problems.
Stretch wrap and freight claims
When a pallet arrives damaged, carriers often look at packaging first. A pallet that was poorly wrapped, overhanging or not tied to the base gives the carrier an argument that the damage came from inadequate packaging rather than handling. Photos of properly wrapped pallets at pickup are a shipper’s best protection. In-trailer securement, which is a separate issue, is covered in load bars, straps and airbags.
Where technology helps
Some wrapping machines now record how much film each pallet received and at what tension, which creates a record of how the load was prepared. Camera systems at the dock can photograph every outbound pallet. As an AI transportation consultant, I see AI image tools beginning to flag pallets that look poorly wrapped or overhanging before they are loaded. These tools are useful, but they work best when the wrapping process itself is consistent.
A quick checklist
- Is the pallet stacked square with no overhang?
- Is the film tied into the pallet base?
- Are there extra wraps at the top and bottom?
- Is the tension consistent from bottom to top?
- Are labels visible and scannable?
- Was the pallet photographed before loading?
Good wrapping is cheap. Bad wrapping is expensive. The difference is mostly habit.
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About the author: Luis Lopez is a Miami-based AI transportation consultant and logistics entrepreneur, the CEO of Go Hub.io Holdings Corp and subsidiaries, and host of the Freight Guru Podcast.