Illustrative inspection checklist

Seal strength

Peeled after conditioning, not judged by eye

Adhesive coverage

Continuous across the flap, with no dry ends

Film gauge

Measured across the roll, because it varies edge to edge

Stretch

Measured on the machine, at the declared pre-stretch

Core diameter

Because it decides whether the roll fits the machine

Print registration

Within tolerance, on the substrate it will actually run on

Tear edge

Clean and even, tested on the roll rather than on a sample

Marking

Batch identifier legible on the roll or its carton

An illustrative checklist for a fictional range. A real programme defines the tolerance, the sampling method, the inspection window and the remedy if a batch fails.

The four things a programme needs in writing.

The tolerance, the sampling method, the window in which inspection happens, and what happens if the batch fails. Without all four, a failed delivery becomes an argument rather than a process.

Why the gauge is measured across the roll.

Because film varies from edge to edge. A single measurement at the centre describes the middle of the roll and nothing about the edges, which are where a machine wrap fails.