Induction sealing starts with a correctly applied cap, liner and bottle finish.
Induction sealing depends on the cap, liner and bottle land being presented correctly before the container reaches the sealer. The induction unit heats the foil layer; it does not tighten the cap or correct cross-threading, a missing liner, a damaged land or inconsistent cap seating.
A controlled sequence helps identify whether a defect starts with the packaging, capper or sealer.
| Stage | Evidence to control | Typical decision |
|---|---|---|
| Incoming closure | Correct cap and liner identity, condition and batch | Quarantine mixed, damaged or incorrectly lined closures. |
| Bottle after filling | Clean, undamaged sealing land and stable product condition | Correct filler splash or neck contamination before capping. |
| After capping | Square cap, correct height and approved torque or seating result | Reject cross-threaded, missing or visibly damaged closures. |
| After induction sealing | Agreed bond, visual, leak and opening checks | Adjust only after the cap and package are confirmed correct. |
| Changeover and restart | Correct recipe, closure variant and first-off sample approval | Prevent lined and unlined formats from being mixed. |
No. An induction sealer heats the foil liner; it does not correct cap torque, cap height or thread engagement. The closure must already hold the liner against the correct bottle sealing surface before it reaches the induction field.
Treat the capper and sealer as consecutive controlled stages. A bottle that is uncapped, cross-threaded or missing the correct liner should be detected or removed rather than relying on the sealer to create a sound package.
Cap application establishes the pressure and alignment that hold the liner against the bottle land during sealing. Inconsistent seating can create uneven contact even when the induction unit delivers the same energy to every bottle.
Confirm closure identity, cap placement, bottle land condition and the approved torque or seating method before tuning the sealer. The complete pack should be assessed after both operations.
No. A damaged or contaminated sealing land, incorrect liner, loose cap or skewed closure can prevent uniform contact and should be corrected at source. Increasing sealer power cannot reliably repair a mechanical packaging defect.
Inspect the bottle land and liner before changing induction settings. Keep rejected examples so the filler, capper, packaging components and sealer can be evaluated in the correct order.
Record the complete closure and liner specification, supplier batch and orientation, and verify that every trial cap contains the intended liner. Similar-looking closures can use different liner constructions that behave differently during application and sealing.
Do not mix lined and unlined caps in the same trial hopper. Retain unused samples and sealed references, and record any change in cap torque, seating or induction response when the liner variant changes.
Inspect cap position, liner bond, visible damage, opening behaviour and the package-specific leak or integrity method agreed for the product. A foil that appears attached is not by itself proof that the complete pack will perform as required.
Use identified sample sets for destructive checks and record sealer settings, line speed, capper setup, packaging batch and elapsed time. Include start-up and restart samples as well as steady running.
Possibly, but the closure variants must be treated as separate approved formats unless testing proves the same settings are suitable. A liner can alter friction, stack height, cap presentation and later removal behaviour.
Document which closure variant is loaded, prevent mixing and complete first-off checks after changeover. The induction sealer must also be interlocked or bypassed according to the approved line procedure.
Send representative samples, the target output, current problem, line layout and the quality checks that matter. Lancing can use that evidence to identify the next practical trial or machine route.
Request capping advice