A nozzle used for discharging viscous fluid

摘要

A nozzle used for discharging viscous fluid therethrough, comprising: (a) a glue chamber (23) having a nozzle opening; (b) a valve rod (28) disposed in said glue chamber and having a tip end (28a) for opening and closing said nozzle opening; (c) a cylinder in which a piston (27) connected to a rear end of said valve rod slide; (d) a pressurized air source (39) for supplying pressurized air to said cylinder; and (e) a seal section (22) disposed between said glue chamber and said cylinder and formed with a passage through which said valve rod moves, said seal section preventing communication between said glue chamber and said cylinder, said seal section including a gas flow passage through which gas is supplied to and discharged from said passage; and a gas supplier for supplying gas to said gas flow passage.