Originally Published MPMN March 2005
HOTLINE
Slim Nozzles Allow Small Cavity SpacingUnits can process many standard materials
Susan Wallace
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| Various versions of slim nozzles allow small cavity spacing in multicavity molds. |
Slim nozzles are available for direct gating of parts in multicavity molds. The units, developed by Ewikon Hotrunner Systems (East Dundee, IL), are designed for processing materials such as polypropylene, polyethylene, ABS, and polystyrene.
The HPS III-VT nozzles have a shaft diameter of 9.5 mm. They are suitable for internal gating of parts or for gating in areas that are difficult to access. In multicavity molds, distances between cavities as small as 12 mm are possible. Extended tips are offered for internal gating of screw caps. For materials with a stringing tendency, such as polypropylene, a version with extended sealing sleeve in combination with a tip extension is used to reduce the introduction of heat into the gate area.
For more demanding materials, the company offers a slim version of its high-performance nozzle. It has a flow channel of 4.5 mm and a shaft diameter of 13 mm. A minimum gate distance of 22 mm can be achieved.
All nozzles are available in lengths up to 179 mm for front or standard installation. The front installation version enables easy maintenance or replacement without having to dismantle the hot half. Both nozzle types are offered as compact valve gate versions with integrated needle drive.
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