Stretch Film Sample Trial: What to Check Before Approval

A stretch film sample can pass a short demonstration and still disappoint in production. The trial may have used an easy load, a fresh roll or a wrapping pattern that nobody recorded. A useful sample trial answers a narrower question: can this identified film, applied with a repeatable procedure, meet the requirements of our actual load and handling route?

Write the decision before opening the sample

State why you are evaluating a new film. It might be a roll change, a different pallet configuration, repeated breaks or a need to compare consumption. Keep the purpose visible, but retain the load-security requirements that the replacement must meet.

Choose representative loads, including the difficult geometry that production regularly encounters. Record pallet dimensions, approximate loaded height and weight, carton arrangement, sharp edges and anything likely to change between runs. Agree who can approve the result: purchasing should not have to interpret a warehouse demonstration without the operations team's acceptance criteria.

When you request stretch film samples for an application trial, provide the load information and the equipment or dispenser details. Ask for enough material to evaluate repeated cycles, roll handling and a meaningful portion of the roll. A sample quantity should follow the trial plan rather than an arbitrary number of pallets.

Keep the trial repeatable from one roll to the next

Identify every sample by supplier, product code, batch and roll specification. Retain its label. Confirm that the sample represents the grade and roll format being quoted for production, including any dispenser or adapter needed to use it.

For machine stretch film trials, record the wrapper model, threading, pre-stretch arrangement, wrap force and wrapping recipe. Include overlap and any extra turns at the top, middle or base. Use the film and equipment makers' operating instructions, documenting adjustments rather than transferring an unverified setting from another grade.

For hand stretch film evaluation, record the dispenser, operator and wrapping procedure. Operator variation is part of production reality, but an uncontrolled change halfway through a comparison makes the result difficult to interpret. Keep the initial comparison consistent, then check whether other trained operators can reproduce the approved outcome.

Use three checkpoints, rather than one quick visual inspection

During application

Log film breaks, restarts, unwind behaviour, tracking and any difficulty changing rolls. Watch for carton distortion and problems around the load's corners. Measure film used and record cycle or working time if these are part of the purchasing decision.

After wrapping and the agreed holding period

Check the load's condition and the security of the film tails. Where containment force is measured, use a suitable tool and a consistent method at the top, middle and bottom of the load. Record the measurement locations and elapsed time after wrapping so the readings can be compared meaningfully.

After representative handling

Inspect for product movement, leaning, tearing and loss of the intended connection between load and pallet. Use the handling steps agreed in the trial plan. If a shipment route requires formal validation, work with a suitable testing provider rather than treating a short warehouse movement as equivalent to a transport test.

Keep formal testing records separate from routine sample-trial notes. Only describe a load as tested to a particular method when that method was actually followed and documented.

Make approval specific enough to use on the next order

Keep the results together: sample identity, load description, settings or manual procedure, consumption, failures, photographs and the outcome at each checkpoint. Record unsuccessful attempts as well as the final passing run. That history explains what the approved recipe requires.

• Approve: the identified grade and procedure meet all agreed criteria for the stated loads.
• Retest: a defined variable must change, and the affected checks need repeating.
• Reject: the sample cannot meet the required outcome within the agreed operating conditions.

Transfer the approved specification and recipe to the purchase order and operating record. Define which future changes trigger another trial. Approval then becomes a traceable decision that receiving staff, operators and purchasing can use together.