Direct answer
Centrelining defines the proven nominal setting and acceptable operating window for critical machine parameters. Establish settings from stable good production, mark physical datums, record recipes, monitor drift and investigate repeated movement instead of allowing each operator to create a different setup.
Choose parameters that affect the finished pack
Focus on guide width, rail height, sensor position, belt speed, nozzle height, torque, temperature, pressure, dwell, web tension and other values that change output or quality.
Avoid recording every adjustment without understanding whether it is critical; too many uncontrolled numbers make the standard unusable.
Establish a proven nominal and operating window
Run representative product and packaging, stabilise the process and record the settings associated with sustained good output. Then determine how far each parameter can move before quality or reliability changes.
Record units and measurement method so “5” does not mean a different physical position on another machine or after a component is replaced.
Make settings easy to restore
Use scales, digital indicators, fixed stops, coded change parts, reference marks and protected recipes. Photograph complex arrangements from a consistent viewpoint.
Check that the datum itself is stable; a scale on a loose guide does not create repeatability.
Use drift as a diagnostic signal
If operators repeatedly move away from the centreline, investigate product, packaging, wear, temperature or supply conditions. Do not simply widen the approved range until defects disappear from the record.
Review centreline compliance after maintenance, tooling replacement and supplier changes.
Information to prepare
- Critical setting list by product and format
- Proven nominal value and unit
- Acceptable operating window
- Physical or digital setting datum
- Recipe access and change record
- First-off pack verification
- Drift investigation and review trigger
Packaging Automation UK
Control, recipe and automation integration for repeatable packaging production.
