Many inkjet printers use an elastomer cap to form a hermetic seal around the printhead
while also providing a mechanism for venting, such as to prevent pressure spikes when capping and
also to prevent pressure differentials such as due to environmental swings in temperature and
pressure. The present paper describes a method for guiding ink flow out of a printhead through
capping lips of the elastomer cap. The purpose of capping system is to reduce the rate of vehicle
loss from the pen’s nozzles. For instance, capping may help prevent the pen from falling out of PQ
spec due to vehicle loss.
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INC, HP, "INK FLOW CHANNEL ON CAP LIPTO RESOLVE PEN HEALTH ISSUES", Technical Disclosure Commons, (February 14, 2019)