Hand Wrap or Machine Wrap: When a Stretch Wrapper Pays for Itself

Why do wrapped loads still shift in transit?

Nine times out of ten the load was never attached to the pallet.

Film wrapped around the cartons alone makes a tidy column that slides off the deck as one piece the first time a trailer takes a hard corner. The base wraps have to include the pallet itself, two or three full revolutions catching the top deck boards, so the load and the pallet become one object.

The second cause is too little containment force. A load can be covered in film and still be loose if the film went on without tension. Coverage and containment are different things, and only containment keeps a stack square.

Third is the wrong film for the load. Sharp corners, protruding hardware, and heavy dense product tear film that would hold a stack of cartons without complaint.

What does stretch film gauge mean?

Gauge is thickness. 100 gauge equals 1 mil, or one thousandth of an inch, so 80 gauge film is 0.8 mil thick.

Common hand film runs 60 to 90 gauge. Machine film runs in a similar range but performs differently, because a wrapper thins the film as it prestretches it. An 80 gauge film prestretched 250 percent arrives on the load far thinner than 80 gauge applied by hand.

Thicker is not automatically better. Gauge buys puncture resistance, not holding power. A load that keeps shifting usually needs more containment force or a better wrap pattern, not heavier film, Increasing gauge alone can add cost without correcting the underlying containment issue.

What does prestretch do to the cost per load?

Prestretch is film stretched before it reaches the load. Prestretch is one of the biggest factors affecting film usage and cost per load.

Polyethylene stretch film is engineered to elongate several times its length. A powered prestretch wrapper runs the film between two rollers turning at different speeds, commonly stretching it 200 to 300 percent. One foot of film off the roll becomes three or four feet on the load.

Hand wrapping gets a fraction of that. An operator walking a pallet with a roll in hand achieves maybe 10 to 15 percent stretch, and it varies with how tired the operator is by the end of a shift.

The consequence is straightforward. The same roll wraps two to three times as many loads on a machine, and the film ends up under real tension instead of draped. Film cost per load falls, and load integrity improves at the same time. That combination is rare enough to be worth checking against the current spend.

Cast film or blown film?

Two manufacturing processes, two different sets of strengths.

Cast film is extruded through a flat die and cooled on a chill roll. It comes off the roll quietly, runs clear enough to read a label through, unwinds consistently, and prestretches well. It is the default for machine applications.

Blown film is extruded upward through a circular die and air cooled. It is tougher, with better tear resistance and better puncture resistance, but cloudy, loud to unwind, and harder to prestretch.

Cast suits uniform cartons and machine wrapping. Blown suits sharp corners, irregular loads, and hand wrapping in cold conditions. Loads with genuinely aggressive corners often do better with corner boards and cast film than with heavier blown film.

How should a load be wrapped by hand?

Start at the bottom, not the middle.

Anchor the film to a corner, then run two or three full revolutions around the base, catching the pallet deck itself. Twisting the film into a rope for those base wraps concentrates the force and grips the deck boards better than a flat band.

Work up the load with roughly 50 percent overlap on each pass, so every section of the stack carries two layers. Keep steady tension throughout. Leaning back against the roll gives more consistent pull than walking faster.

At the top, add two extra revolutions if the load is light or unstable, then work back down. Ending at the base rather than the top puts the tail where it will not catch on a forklift.

A load that has to be wrapped twice to feel solid is telling the operation something. Usually it is the base wraps.

How is the right amount of film measured?

By containment force, not by roll count.

Containment force is the pressure the film holds against the load, measured in pounds with a pull-plate gauge. The test takes a minute: slide the plate under the film at the bottom, middle, and top of a wrapped load and record the pull at each height. Heavier and less stable loads need more; light uniform cartons need less.

That measurement is worth taking on an actual finished load rather than assumed from a wrap count. Most plants discover the top of the load is holding far less than the bottom, which is exactly where a load starts to lean.

Recording it once also gives a baseline. When film is changed or a supplier is switched, the same test on the same load says whether the new film actually performs.

When does a stretch wrapper pay for itself?

The math is short enough to run on a notepad.

Take the current film cost per load, which is roll price divided by loads per roll. Take labor minutes per load and multiply by a loaded hourly rate. Add whatever damage claims trace back to shifted loads. That is the current cost per load.

Then the machine version. Film cost per load falls by roughly half to two thirds, because prestretch does the work. Labor drops to the time it takes to set a pallet on a turntable and press a button, typically a minute or two rather than several. Damage from loose loads usually drops as well.

Multiply the difference by loads per year and compare against equipment cost. A semi-automatic turntable wrapper is the entry point; a plant already running one and outgrowing it looks at an automatic or a straddle wrapper.

The honest answer is that the crossover is a function of volume. Any plant wrapping enough pallets that an operator spends a real part of the day walking backward around them has already crossed it. The arithmetic above shows exactly where.

What should be checked before switching film?

Seven things, and one test that settles it.

• Load weight and stability
• Corner sharpness
• Hand or machine, and the prestretch percentage if machine
• Current gauge
• Current loads per roll
• Whether loads travel by truckload, LTL, or over the road for multiple days
• Storage conditions, since cold changes how film behaves

Any film change should be tested on a real load with a pull-plate reading before and after. A film that costs less per roll and delivers less containment is more expensive than the one it replaced.