Mini Lab Thermo Haake Micro Rheology Compounder Mini

Mini. Lab Thermo Haake Micro Rheology Compounder

Mini. Lab Micro Rheology Compounder Conical twin-screw compounder: • • co- and counter rotating possible automatic bypass operation for extrusion/recirculation viscosity measurement integrated in backflow channel pneumatic feeding inert gas flush (feeding area + extruder barrel) digital and graphic data display manual and computer control possible

Mini. Lab Micro Rheology Compounder

Mini. Lab Micro Rheology Compounder p 2 Backflow channel with rheological slit capillary die p 1 Bypass valve Output channel

Mini. Lab Micro Rheology Compounder Application: • • Micro sample-amount (5 g) Development of new polymers Testing of expensive materials Material studies at universities Rheological studies Reactive extrusion Sample preparation for further testing Sample preparation in combination with a micro injection moulding machine

Mini. Lab Possible screw design Co-rotating Counter-rotating

Twinscrew Extruder Counter-rotating twinscrew design: - Defined residence time (good for i. e. fast degradating material) - Forced extrusion – defined volume flow ( important for rheological measurement) - Self-cleaning - High shearing - High pressure built-up Co-rotating twinscrew design: - Mixing of shear sensitive material (i. e. PE / PP) - Best compounding behaviour (i. e. for the preparation of Masterbatches) - Lower shearing

Characteristics of Mini. Lab screw types

Mini. Lab Micro Rheology Compounder . . as a micro compounder

Mini. Lab Compounding Example:

Comparison of output: Constant speed - Constant torque

Mini. Lab Extrusion/Output Ratio

Mini. Lab Micro Rheology Compounder . . as a reactive extruder

Mini. Lab – Reaction monitoring

Mini. Lab Micro Rheology Compounder . . as a relative viscometer

Mini. Lab Micro Rheology Compounder p 2 Backflow channel with rheological slit capillary die p 1 Bypass valve Output channel

Rheology Newtonian plate model Area A Force F dv dy Shear Stress: Shear Rate: dv g = dy. Viscosity: h = t . g

pressure Rheological backflow channel pressure drop dp dl channel length W P 3 T 2 sensor ports P 1 H

Slit Capillary Channel Calculations for Newtonian liquids Pressure Gradient: Volume flow: Shear stress: . 6·Q = W · H² Shear Rate: g Viscosity: t h=. g

Results 1, 0 E+6 Viscosity [Pas] Shear Stress [Pa] 1000 Viscosity curve 100, 0 E+3 Flow curve 10, 0 E+3 10 100 Shear rate [1/s] 1000 10 10000

Mini. Lab - Relative Rheology: