HTPHow to PackageProduction answers by Lancing UK
End of line

How do I reduce material waste and rejects during metal detection?

Practical guidance for metal detection: reduce product loss, damaged packs, film waste and avoidable rejects.

Answer format: direct explanation, ordered checks and relevant solution routes. . Application-specific engineering review is still required.

Direct answer

For metal detection, measure where material or product is lost and calculate waste per good pack. End-of-line equipment must receive stable products at a controlled rate and create a pack that survives handling, storage and transport. Start by separate product, packaging and rework waste and record good packs per minute, material use, seal or closure quality and transport damage. Make one controlled change at a time so the original cause is not hidden by several new settings.

Production environment relevant to end of line
Work safely: Isolate machinery before inspection or clearing. Follow the machine manual, site procedures and competent-person requirements.

What usually causes this?

  • overfilling, over-application or excessive trim used as a safety margin
  • A change in product grouping and spacing or film, carton, case or tray quality.
  • start-up and changeover settings not standardised
  • The equipment or handling method not being set for inspecting suitable products for metal contamination within a validated system.
  • damaged or misfed packaging creating repeated rejects

Checks to make in order

  1. Separate product, packaging and rework waste
  2. Record good packs per minute, material use, seal or closure quality and transport damage using a representative sample.
  3. Weigh or count loss during start-up, running and changeover
  4. Check machine entry and transfer control, heat, tape, glue or closure settings and finished-pack inspection and discharge.
  5. Record the reason for every reject in a sample period
  6. Check whether waste changes with speed or pack size
  7. Calculate the financial value of giveaway and damaged packs

How to decide the next step

Metal detection involves inspecting suitable products for metal contamination within a validated system. Prioritise the largest measured loss, then verify that the change does not reduce seal, dose or closure quality.

If adjustment and maintenance cannot hold the required result across the complete product and pack range, compare the machinery route against a written acceptance test. The important comparison is sustained good output—not only maximum cycle speed.

What to include in your production brief

Supplying the information below makes it much easier to distinguish a setup problem from a machinery or packaging limitation:

  • Product and finished-pack dimensions
  • Pack pattern and orientation
  • Film, board, tape or case specification
  • Required output
  • Conveyor height and direction
  • Transport and stacking test
  • Samples that represent metal detection
  • A short video of the current process and fault

Relevant solution websites

These specialist sites match the production process discussed above. Final suitability should be confirmed with samples, output, site and acceptance information.

Shrink Wrapping MachineryCartoning MachinesCase Tapers

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Common search questions

Questions customers also ask

Open a question for a concise answer, then use the detailed guide above for the full production checks.

What should I check first for metal detection?

Separate product, packaging and rework waste

What commonly causes this problem with metal detection?

Common causes include overfilling, over-application or excessive trim used as a safety margin; A change in product grouping and spacing or film, carton, case or tray quality.; start-up and changeover settings not standardised.

How can I prove that an adjustment has worked for metal detection?

Record a representative baseline, change one variable at a time and repeat the same measurement over enough packs to show that the result is stable rather than a one-off improvement.

When should I consider a different machine or production method for metal detection?

Consider a different route when correct setup and maintenance cannot hold the required quality and sustained output across the complete product and pack range.

What information should I send before asking for a solution for metal detection?

Include Product and finished-pack dimensions; Pack pattern and orientation; Film, board, tape or case specification; Required output.

Which solution website is most relevant to this question?

The clearest starting point on this page is Shrink Wrapping Machinery. Final suitability still needs to be confirmed using the actual product, packaging, output and site information.