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Troubleshooting guide

Capping machine troubleshooting: common issues to check.

Poor capping results are not always caused by the capping machine. The cap, bottle, product, feeding method and line handling can all affect the finished pack.

Troubleshooting

Specify the capper around the closure, bottle and production target.

Lancing can help shortlist practical capping machinery after reviewing cap type, neck finish, bottle stability, output target, torque requirement and the way caps are presented to the machine.

Automatic screw capping machine for troubleshooting cap application issues
Troubleshooting

Capping machine troubleshooting: common issues to check

Poor capping results are not always caused by the capping machine. The cap, bottle, product, feeding method and line handling can all affect the finished pack.

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Useful details for a quote

  • Cap diameter, height and closure type
  • Bottle height, diameter, shape and material
  • Target bottles per minute or per hour
  • Manual cap placement or automatic cap feeding
  • Existing filler, labeller, conveyor or line layout
Selection notes

What affects the correct capping route?

Leaks after capping

Check cap torque, liner condition, neck finish, filling contamination around the neck, cap seating and whether the bottle is stable during tightening.

Inconsistent torque

Look for bottle rotation, worn tooling, incorrect chuck fit, cap variation, unstable guides, operator placement differences and incorrect machine settings.

Cap feed problems

Jams and misfeeds often come from cap geometry, orientation, static, damaged caps, bowl settings, overfilling the feeder or trying to feed a closure that needs specialist handling.

Next step

Send bottle and cap information before final machine selection.

Photos, dimensions and target output help identify the most likely capping route. Physical samples are normally the best way to confirm tooling, cap feeding and bottle support.

FAQ

Common questions

Why are caps cross-threading?

Cross-threading can be caused by poor cap presentation, bottle misalignment, thread variation, cap damage or the capper engaging before the cap is correctly seated.

Why do bottles spin during tightening?

Bottles can spin if side belts, clamps, nests or guides are not supporting the container well enough for the required torque.

Can Lancing help with an existing capping issue?

Lancing can review samples, photos and line details to help identify whether the issue is machine setup, tooling, cap feed or packaging compatibility.

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