Why Measure Cap Skirt Gap Before And After Liner Fitting

A cap skirt can sit at a different height after a liner is added. A liner may contact the bottle land and compress as the cap is tightened, which can change where the closure comes to rest. The skirt gap records the visible position relative to the shoulder. It does not directly tell you how much the liner has compressed or whether the seal is sound.

Compare matched assemblies

Use the same cap and bottle design and follow the agreed application method for each build. Record the liner type, applied torque, time after closing and the gap at the same points around the skirt. Use separate matched units if removing and reinstalling a liner would change the fit. An uneven gap can come from tilt or variation in the shoulder, so a single reading on one side can mislead.

Check the function of the lined build separately

Use the without-liner sample to understand which surfaces determine the seating position. Confirm the actual production combination against its closure, appearance and leak requirements. If both builds show the same gap, check whether a hard stop controls cap position. If the gap changes, examine the actual contact and test the package before drawing a conclusion about sealing.

Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information: sambound.com.

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