Comment
a good saving on paper, but the reality on the production line is that it can cause premature failure of the tooling. These are assumed fi gures, not a customer case study. They exclude additional downtime, cleaning, investigation and disposal costs.
Compare the existing and intended casings using cost per saleable kilogram, with the same costing basis. Include casing and clip use, closure- related rejects before and after cooking, additional labour and stoppages. Separate one-off trial or tooling costs from recurring production costs.
TEST THE COMBINATION UNDER PRODUCTION CONDITIONS The purpose of a trial is not to show that the line can make one good pack. It is to establish an operating window wide enough for normal production variation, with results that purchasing, production and quality can assess together. Start with a baseline from the current approved combination. Agree acceptance criteria before testing; closure integrity, rejects, saleable output per hour and performance after cooking and chilling. Specify the sample quantities and test methods with quality and the casing and clipping specialists. A small number of satisfactory packs is weak evidence for a defect that occurs intermittently.
Obtain the proposed casing’s full specifi cation, including gauge tolerances, calibre, construction, preparation requirements and intended thermal use. Follow its storage and conditioning instructions, without assuming that the soaking or handling routine used for the old casing transfers to the replacement. Confi rm the compatible clip, punch and die, then record the closing setting, casing brake, fi ll conditions and product recipe. Change one variable at a time during troubleshooting. An altered casing, clip and machine setting introduced together without records make it diffi cult to identify what improved or damaged performance.
Testing should run at the intended speed and include start-up, steady running, short stops, restarts and casing reloads. Cover representative product batches and casing lots, including the normal limits of temperature and consistency. Where several recipes use the same casing, assess the relevant products - rather than approving them all from one trial. Look at the fi lled diameter, clip position, closure dimensions using the equipment supplier’s method, casing damage, leakage and retention. Agree any pull-off or other destructive testing with specialists, rather than relying on an informal tug test. Carry identifi ed samples through the
actual cooking and cooling process, followed by handling and storage checks appropriate to the product, recording saleable output and losses throughout.
MAKE PURCHASING AND PRODUCTION SHARE THE DECISION
The casing supplier should establish material suitability, and the equipment specialist should confi rm the closure options. Production and quality should verify the result on the actual line. Purchasing can then compare a demonstrated saving, with the full cost of achieving it. This involvement is most useful before a supply contract or stock commitment makes a failed trial costly to reverse.
Once approved, document the casing
specifi cation, clip reference, tooling and settings by recipe. Make that information available across shifts, retain batch traceability and trend closure- related rejects after launch. Agree with suppliers which material changes require notifi cation and reassessment.
Lightweighting can be suitable when it reduces cost - while maintaining reliable output. For a clipping operation, the purchasing decision is complete only when the casing, clip and production process have demonstrated that result together.
www.convertermag.com
September 2026
13
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