Graeme Herlihy, Engel UK, MuCell Process
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Graeme Herlihy, Engel UK, Introduction to MuCell
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Graeme Herlihy, Engel UK, MuCell Process
- 1. Introduction to MuCell® Graeme Herlihy Managing Director – Engel UK
- 2. MuCell® equipment | insert gas into the melt MuCell® barrel + MuCell® Interface Kit MuCell® Gas dosing unit Gas distribution
- 3. Why foaming of thermoplastics? • lighter • more accurate • more economic MuCell® | foaming of thermoplastics
- 4. • Foming agent - N2 or CO2 • “Internal“ homogenous post-pressure - no sink marks - minimized warpage - weight saving - clamp force reduction • Viscosity lowering - due to physical foaming agent - optimised filling of cavity – new mould and filling strategies possible MuCell® | foaming of thermoplastics
- 5. Strategic benefit | capacity use MuCell® | reduced cycle time Source: Trexel Reduced cooling time More exchange, Less temperature Hold time (nearly) eliminated ΔT Solid MuCell® Pack&Hold CoolingInjectionOpening/Eject./ Closing ΔT depends on material type, part design and mould cooling
- 6. Cycle time reduction | optimized cooling is the key Hot spots | optimized cooling system required hot spots – optimised cooling system required
- 7. MuCell® | clamp force reduction Strategic benefit | lower tonnage • Reduced filling pressure • No “external” holding pressure
- 8. Surface quality | surface defects streaks on part surface Optimazation | • special material grades • higher injection speed • variotherm mould heating • IML • gas counter pressure • coinjection (core foammelt - skin compact) • … Filling process | creation of streaks
- 10. • volumetrically filling of the cavity • increasing the cavity - by clamp unit or by mould internally • foaming inside the cavity MuCell® + decompression stroke | function part thickness time platen screw mould closed serial precision opening (parallelism controlled)stroke
- 11. MuCell® + decompression stroke | advantages • low density achievable • higher bending stiffness at same part weight • equal cell structures • insulation effect plate PP T20 - starting wall thickness 3 mm - final wall thickness 10 mm half shell PP T20 - starting wall thickness 8 mm - final wall thickness 16 mm
- 12. Introduction to MuCell® Graeme Herlihy Managing Director – Engel UK