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Introduction to MuCell®
Graeme Herlihy
Managing Director – Engel UK
MuCell® equipment | insert gas into the melt
MuCell® barrel + MuCell® Interface Kit
MuCell® Gas dosing unit
Gas distribution
Why foaming of thermoplastics?
• lighter
• more accurate
• more economic
MuCell® | foaming of thermoplastics
• 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
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
Cycle time reduction | optimized cooling is the key
Hot spots | optimized cooling system required
hot spots – optimised cooling system required
MuCell® | clamp force reduction
Strategic benefit | lower tonnage
• Reduced filling pressure
• No “external” holding pressure
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
MuCell® | applications
• 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
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
Introduction to MuCell®
Graeme Herlihy
Managing Director – Engel UK

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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