1. PolyLab System
Twin Screw Extruders :

2. Twin-screw extruders CTW100 and PTW25

3. Feeding of material into twin-screw extruders
Co-rotating
Counter-rotating

4. Twinscrew Extruder Counter-rotating Rheomex Twinscrew Extruders:
Defined residence time (good for i.e.rigid PVC)
Selfcleaning
No controlled feeding needed
High shearing
High pressure builtup
Co-rotating Rheomex Twinscrew Extruders:
Mixing of shear sensitive material (i.e. Polyolefins)
Compounding, Masterbatch production
Venting
Controlled shearing
Flexible screw design
Controlled feeding necessary

5. Conical Twin Screw Extruder Rheomex CTW100p
conical design of barrel and screws: mechanical stability / easy cleaning
counter rotating screws: defined resident time / forced material transport selfcleaning
6 sensor ports: exact examination of sample behaviour dosing via sensor ports possible
venting opening: easy venting with venting screws
3 different screw geometries: - intensive mixing screws - standard screws - venting screws

6. Rheomex CTW100p

7. Rheomex CTW100p

8. Rheomex CTW100p

9. Screw geometries for CTW100p extruder
Venting screw
Intensive mixing screw
Standard screw

10. Rheomex CTW100p

11. Parallel twin-screw extruder Rheomex PTW Processing tasks - 1
Plasticising
Mixing
Homogenising
Cooking
Gelling
Degassing of momomers, oligomers, solvents etc.
Concentrating of polymer solutions
Modifying by incorporation of plasticizers, cross-linking agents, flame retardants, UV-stabilisers, etc.

12. Parallel twin-screw extruder Rheomex PTW Processing tasks - 2
Incorporation of fillers and reinforcing agents such as: wood flour, talc, glass fibres etc.
Alloying of polymers
Polycondensation, Polyaddition and Polymerization of polymers
Chemical reactions
Dispersing of pigments and additives
Breaking down of high molecular particles

13. Parallel twin-screw extruder Rheomex PTW Examples of application
Polyethylene (LLDPE/LDPE/HDPE)
Nanocomposites (Clay, MWCT)
Polypropylene (PP)
ABS
Polystyrene (PS)
PVC (soft)
Polyester
Polyamide
Polyformaldehyde
Cellulose ester
Polyuretthane (PU)
Polycarbonate (PC)
Food
Starch
Polyphenylene oxide (PPO)
Polysulphone (PSU)
Polyacrylonitrile
Toner
Masterbatch
Powder coating materials
curing moulding compounds
Ceramic materials
Pharmaceutical products
Polymethylmethacrylate (PMMA)

14. New PTW16 XL for PolyLab OS
Horizontal split, with a lift-off top to be opened for ease of cleaning, simple removal of the screws and visualisation of the melting process.
The segmented top barrel part is built with 4D modules to be easily reconfigured by the user.
Barrel segments are available for cooling feeding solids, liquids and for venting.

15. Maximum flexibility…
... Feed ports...
... Lenght ...
... Screw design ...
... Split Barrel

16. flexible screw configuration
Rheomex PTW16
flexible screw configuration

17. PTW16 OS - Maximum flexibility…
... Split Barrel

18. PTW16 OS - Maximum flexibility…

19. PTW16 OS - Maximum flexibility…
25 L/D +
15 L/D =
40 L/D

20. … Why don´t you buy two compounders!”
PTW16 XL: D extendable
“what is the right length for my application: L/D 25, or better L/D 40?
… Why don´t you buy two compounders!”
Flexible Length: not for all applications a long extruder is useful, as shear sensitive materials can degrade and 25D is long enough for basic applications.
Optional 15D barrel extension to enhance e.g. residence time (for reactive extrusion) or multiple feed ports, easy to use (< 15 min by operator!)
Software recognizes the Extension unit

21. Metering Feeder for PEEK Pellets Cabon Fiber Roving (endless)
Example: Compounding
Metering Feeder for PEEK Pellets
Cabon Fiber Roving (endless)
Pelletiser Varicut
T = 380°C
20-40% C-Fiber (wt/wt)

22. Rheomex PTW16 Technical Specifications Screws:
Segmented, with slip-on elements, allowing variable configuration
Screw diameter: 16 mm
Corotating, intermeshing screws
Screw shafts:
Design: hexagonal
Material: Heat treated, abrasion resistant

23. Rheomex PTW16p
Screw elements:

24. Rheomex PTW24p

25. New Twin Screws PTW24/28p 2 modular Models 28D and 40D up to 1100 rpm
... Happy customers

26. Economic PTW24 models comparison to 24 „HC“ type
Venting to
Atmosphere
Or option
Liquid feed
Vacuum venting
main
secondary feed
PTW24/40p (HC) 4D modular Elements
Side feed 2
Side feed
Side feed option
main
secondary
feed
Vacuum
venting
PTW24/25p (TC)
PTW24/30p (TC)

27. Speed range: 0 - 500 rpm (optional 0-1000 rpm)
Rheomex PTW24
Technical Specifications
Speed range: rpm (optional rpm)
Pressure range: 100 bar (150 bar optional)
Temperature range: max. 300 °C (400°C optional)
Screw diameter: 24 mm
Barrel length (L/D) : 28:1 to 40:1 (using the optional barrel extension unit)

28. Rheomex PTW24

29. Rheomex PTW24 – Advantages:
Extruder barrel: segmented and hinged
Segmented screw
Sidefeeding

30. Rheomex PTW24 Technical Details: Bore diameter: 24 mm
Screw Centres: mm
Channel Depth: 5.2 mm
Clearance: mm
Total barrel length: 672 mm (28:1 L/D, in 4:1 modules)
Barrel extendable to 40:1 length with optional barrel extension
Feed Zone: Water Cooled
Processing Zones: Electrically Heated / Water cooled
Extrusion Die: Electrically heated

31. Rheomex PTW24p
Screw elements:

32. Rheomex PTW25

33. Rheomex PTW25 with PolyLab System
Master
Slave
Heat-
exchanger
PolyLab System
Rheomex PTW25

34. Parallel twin-screw extruder Rheomex PTW25 Technical data - 1
Drive: PolyLab RC 300p
Extruder: segmented barrel
Length: D
Screws: segmented screw elements
Outer screw diameter: 25 mm
Core diameter: 17 mm
Centre distance: mm
Max screw speed: 400 rpm
Screw elements: Conveying elements Kneading blocks Toothed blocks

35. Parallel twin-screw extruder Rheomex PTW25 Technical data - 2
Max. barrel temperature: 400 °C
Max. melt pressure: 300 bar
Barrel segments: Open barrel 4D Venting, feeding Closed barrel 4D Combi barrel 6D Side feeding and venting Metering barrel 4D Closed barrel 6D Open barrel 6D Venting, feeding Measuring disk 1.5D Measurement of melt temperature or -pressure

36. Parallel twin-screw extruder Rheomex PTW Screw Elements
Conveying elements:
Profiles with open chambers are used: - in the feeding sections - for melt exchange (longitudinal mixing) - for degassing (venting)
Profiles with closed chambers are used: - for high pressure built up - in front of kneading elements

37. Parallel twin-screw extruder Rheomex PTW Screw Elements
Conveying elements:

38. Rheomex PTW – Conveying Elements

39. Parallel twin-screw extruder Rheomex PTW Screw Elements
Mixing Elements :
Mixing Elements are used to introduce shear energy to the extruded materials.
The disks are arranged in different offset angles used for: - plasticizing - mixing dispersing

40. Parallel twin-screw extruder Rheomex PTW Screw Elements
Mixing Elements :

41. Mixing elements

42. Parallel twin-screw extruder Rheomex PTW25 Screw Elements
Toothed blocks :
Toothed blocks are special mixing elements, used for the distribution of even small quantities of additives.
The shearing energy introduced to the polymer is significantly lower than that of the kneading elements.
The open worked flights of the mixing discs have a special asymmetric design.

43. Parallel twin-screw extruder Rheomex PTW25 Screw Elements
Toothed blocks :

44. Rheomex PTW Side-feeding
Venting
Flow direction
Side feeding
Application:
Feeding of glass fibres, fillers or other additives into the molten polymer. Venting of the introduced air.
Requirement:
2 separate feeders necessary for side feeding.
One side stuffer with constant (high) dosing speed to press the material into the barrel.
One feeder to controll the feeding rate.
For constant feeding ratio between polymer and additives gravimetric controlled feeders can be used.

45. 557- 5001 Rheomex PTW 25 x 20D Barrel segments: Feeding barrel 4D
Venting
Barrel segments:
Feeding barrel 4D
Closed barrel 6D
Open barrel 6D
Measuring barrel 4D
Application:
Melting of polymers
Venting

46. Rheomex PTW 25 x 32D Production of Masterbatch
Side-feeding
(pigments)
Venting (vacuum)
Venting (atmosphere)
Feeding
(polymer)
Barrel segments:
Feeding barrel 4D
Closed barrel 6D
Combi barrel 4D
Closed barrel 4D
Open barrel 6D
Open barrel 4D
Measuring barrel 4D

47. Screw configuration Rheomex PTW25/38 For typical food extrusion
25/1/2
37.5/1/2
ZB-37.5
E-KB-25/LI
E-KB-37.5/LI
Screwtip
Dry-Blend
Liquids
Steam
Feeding
Mixing/Hydration
Cooking
Venting
Cooling

48. Masterbatch production
Vacuum
Premix
Atmosphere
Parallel twin-screw
Water bath
Pelletizer