Cap Sealing Application Tips

Mar 13th, 2009 | By | Category: Operating Tips

Are your packages trying to tell you something?

When you visit a doctor you’ll provide him with a list of your symptoms. This  helps him/her define your ailment and prescribe a remedy. The same can be said for your packages when there are problems on the packaging line.

The chart below identifies symptoms you might see when perfecting your cap sealing operation. Each symptom can be traced back to a cause and remedy.


partial, weak or no seal

insufficient power from sealer; conveyor too fast; or power set too low

improper coil height

insufficient application torque

induction liner incompatible with the bottle material bottle neck finish has been flame or chemically treated

imperfections in container finish, land area

product touching liner, heat-sink effect

difficult-to-remove seal

sealer power set too high conveyor speed set too slow

difficult-to-remove cap

insufficient wax melt, conveyor speed too fast or output power set too low

improper coil height (too high)

excessive application torque

foam-liner material welds to polymer in induction liner

product touching liner, heat-sink effect

burnt cardboard liner

excessive sealer power, conveyor too slow or power set too high

bottles back up under sealing head insufficient application torque

gap between liner and container lip caused by defect in container

low removal torque

insufficient application torque, closure not securely applied

excessive application torque, threads of closure stripped

void created when wax is absorbed into pulpboard


excessive power from sealer, conveyor too slow or power set too high

product may be attacking liner, if pinholes occur well after a good seal has been confirmed

liner pinwheel effect

retorquing too soon after induction sealer

wax not absorbed into pulpboard completely

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