Page 18 - Plastics News January 2017
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Shut-off nozzles
For over 40 years, Herzog has built its reputation on the advantages of using them have increased considerably
developing exceptional shut-off nozzles for injection since those times. Nowadays the primary functions of the
moulding machines. As a technology leader, each shut-off nozzle include;
innovative solution is meticulously engineered at its
Swiss facility and since 1996 the company is certified in - Reducing cycle times by dosing the next shot
accordance with ISO 9001:2008. regardless of whether the mould is open or if the
injection unit is retracted
Shut-off nozzles are used exclusively in plastic injection
moulding processing and are often an essential component - Improving part consistency by enabling accurate and
of the machine. Installed at the crucial interface between repeatable shot loading
heated injection unit and cooled mould, the nozzle is the
gateway which regulates the melt flow while bearing the - Facilitating advanced moulding techniques such as
entire contact force of the machine. physical and chemical foaming, melt pre-compression
and multi component injection moulding
Shut-off nozzles were originally developed in the 1960’s
to prevent melt drooling from the nozzle orifice once To cover today’s spectrum of applications Herzog
the injection unit pulled back from the cold mould after continually develops and expands its selection of shut-
injection. This not only prevented loss of material but off nozzles. The product profile ranges from custom-
also reduced process breakdowns. Even today shut-off engineering solutions for specific demands, through
nozzles can still be used for this purpose but of course pneumatic and hydraulic needle and bolt style nozzles,
to economical spring loaded systems.
• January 2017 • Plastics News 18
