PROBABLE CAUSES:
Liner too thick or rigid for closure to apply consistent pressure on the land area
Closure not turning a full 360°
Container finish has saddle, ridges, flashing, parting line or narrow land area
Closure is too large for neck of container
Closure should be designed to have raised pressure bead to cover majority of land area to ensure consistent and complete seals
Land area not level
Part of land area contaminated with product, flame treated or chemical treated
Inconsistency in required on torque
Closure not designed to accommodate the overhang of liner