Pre-start checklists operators actually use

Why checklists get ticked from memory

Every plant has seen it: a pre-start sheet with every box ticked in the same pen, at the same angle, two minutes before the line was due to start. Nobody set out to falsify a record. The checklist taught the operator that ticking it was the job.

Three things make a checklist easy to tick without reading:

• It is long. Forty items, most of which never fail, train the eye to skip.
• It is vague. “Line clean” can be answered yes from across the room. “No product from the previous run on the infeed belt” cannot.
• It changes nothing. If the line starts whatever the sheet says, the sheet is paperwork, and everyone knows it.

Write items someone can verify

A good item names something an operator can see, touch or measure at the machine, and says what “pass” looks like.

• Look: “No product, packaging or labels from the previous run on the infeed, the filler or the outfeed.”
• Confirm: “Date coder set to today’s production date and the right best-before.”
• Measure: “Metal detector rejects the ferrous, non-ferrous and stainless test pieces.” Ask for the result of each, not a single tick.
• Record a value: “Sanitiser concentration at the boot dip,” with the limits, so the reading is judged instead of copied.

Critical items stop the line

Not every item deserves the same consequence. Split them into two kinds, and make the difference visible on the sheet:

• Critical items protect the consumer: allergen clearance, the metal detector, the date code, the right label for the product. A failed critical item means the line does not start until it is fixed and checked again.
• Ordinary items protect the run: a guard in place, a reel of film staged, a tidy station. A failed ordinary item is recorded and authorised by a supervisor, and the line can start while it is fixed.

When operators see that a failed critical item really stops the line, the whole checklist gains weight. When they see a supervisor sign off an ordinary item instead of waving it through, the rest of the list stops being theatre.

Changeovers deserve their own list

The riskiest moment on a packaging line is not the first start of the day; it is the switch from one product to another. The previous product’s labels, film and allergens are all still within reach. A changeover checklist should name what must leave the line, not only what must be ready:

1. 1Remove every label, film reel and printed carton from the previous product.
2. 2Clear product from every contact surface, including the ones behind guards.
3. 3Clean to the level the allergen matrix asks for, and verify it.
4. 4Set the date coder and confirm the first printed code.
5. 5Check the first packages against the new product’s spec, starting with the fill weight, before the line runs at speed.

How totalMOS handles it

In totalMOS, pre-start and changeover checklists gate the run on the iPad at the line. Items can be a check, a value with limits, or a note, and each can be marked critical. A failed critical item never starts a line; an ordinary one goes to a manager’s authorisation queue, and the check countdowns can start while the sign-off is pending. The completed checklist is part of the session’s record, next to every check the run recorded. The snack food demo plant shows a full pre-start checklist.