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Expansion injection moulding
Expansion injection moulding is an innovative injection moulding technique to
fill the thin-wall parts with small shot weights.
Source: ENGEL Austria GmbH
The process cycle of the expansion injection moulding
can be described in pvT-diagram. After the
mould has been closed the melt is compressed to
the maximum pre-compression pressure (pK) in
the injection unit with closed shut-off nozzle. By
opening the shut-off nozzle, the compressed melt
is allowed to expand which leads to a decrease in
pressure at screw antechamber from maximum
compression pressure (pK) to an end pressure
(pE) as a function of expansion time (t). These
pressure differences generate higher volumetric
flow rates to fill the cavity.
Rajganesh Jegadeesan
Institut für Kunststoffverarbeitung - IKV
an der MUL seit: 2006
Email: rajganesh.jegadeesan@unileoben.ac.at
Zur Person:
Master of Polymer Engineering and Science
Presently: Dissertation at IKV-Institute for Plastics Processing
For the injection moulding of thin wall parts with
wall thickness less than 0.3 mm and flow length/
wall thickness ratio up to 450:1 a new injection
moulding technique called expansion-injection moulding
(ENGEL X-Melt) was developed by Engel Austria
GmbH, Austria. The main feature of this process is
the separation of the melt compression and injection.
At first the melt is compressed to maximum
compression pressure of approximately 1800 to
2500 bar in the space in front of the injection screw.
For that, the injection unit is equipped with a controllable
shut-off nozzle or the mould with hot runner
shut-off nozzles.
Forschungspartner:
Forschungsschwerpunkte:
Expansion injection moulding,
Pressure dependency of viscosity,
Cadmould 3D-F simulation