5th Congress of Plastics Converters
Compounding Technologies, Advantages and
Applications of Buss Kneaders
Dipl. Ing. (TH) Frank L. Knittel
Business Manager
Plastic Compounding Technologies
10.11.2011 / KF
5th Congress of Plastics Converters
Contents of Presentation






Buss Kneader working principle
Technical features and general advantages
Comparison with twin screw extruders
Compounding applications with advantages
of Buss Kneader
Summary
Contact information
10.11.2011 / KF
5th Congress of Plastics Converters
Buss Kneader Working Principle
10.11.2011 / KF
5th Congress of Plastics Converters
Self-cleaning and Mixing Efficiency
Distributive mixing by screw
flight movement through the melt
Dispersive mixing in the shear
gap between bolt and screw flight
10.11.2011 / KF
5th Congress of Plastics Converters
General Buss Kneader Advantages
- Split barrel for easy cleaning
maintenance and modifications
- Segmented screw and liners
- Working principle ensures
optimal temperature and shear
control
- Highest mixing efficiency for
max. filler loading
- Liquid tempering of barrel and
screw for perfect process
conditions
- Exact measurement of melt
temperature via thermocouples
in pins
- Max. feeding of liquid additives
via injection pins
- Newest Kneader series with
more efficient 4-flight screw
10.11.2011 / KF
5th Congress of Plastics Converters
Full modularity of process section
The screw consists of
individual elements, which
can easily be exchanged or
replaced.
Also kneading pins and barrel
liners can easily be exchanged
or replaced.
10.11.2011 / KF
5th Congress of Plastics Converters
Exact measurement of melt temperature
Thermocouple located in
pin and directly immersed
in polymer melt
10.11.2011 / KF
5th Congress of Plastics Converters
Max. feeding of liquids via injection pin
Liquid directly injected
into polymer melt
10.11.2011 / KF
5th Congress of Plastics Converters
Shear rate comparison with co-rot. TSE
10.11.2011 / KF
5th Congress of Plastics Converters
Shear rate comparison with co-rot. TSE
10.11.2011 / KF
5th Congress of Plastics Converters
Discharge arrangements of Buss Kneader
Typical Applications:








10.11.2011 / KF
PVC
Peroxide crosslinkable XLPE
Extremely high filled compounds
HFFR compounds
Multipurpose applications
Semiconductives, master batches
Silane crosslinkable XLPE
Low viscous or sticky compounds
(TPE, TPV)
5th Congress of Plastics Converters
quantec® Kneader for PVC
Advantages of Kneader:
-
10.11.2011 / KF
Lowest possible temperature level
Perfect degassing in cascade
tube
Start up chute for easy start up
Cascade configuration is most
flexible
Excentrical die face pelletiser for
lowest back pressure
Swing out pelletiser design for
easy product change over
5th Congress of Plastics Converters
quantec® Kneader for calender feeding
Advantages of Kneader:
-
-
10.11.2011 / KF
Lowest possible temperature
level
Compounding & degassing in
one step
Intermittent cutting device
ensures uniform & compact
lumps
Most compact machine design
5th Congress of Plastics Converters
MX Kneader for Cable Compounds
Advantages of Kneader:
-
10.11.2011 / KF
Incorporation of highest filler
levels for HFFR and Semicon
Perfect dispersion of powders
Unique temperature control for
ATH compounds
Excentrical die face pelletiser for
lowest back pressure
Swing out pelletiser design for
easy product change over
5th Congress of Plastics Converters
MX Kneader for Masterbatches
Advantages of Kneader:
-
-
10.11.2011 / KF
Incorporates highest contents
of pigments, fillers and
functional additives
Perfect dispersion of powders
Unique temperature control for
high viscous base polymers
Easy cleaning during colour or
product changes due to split
barrel design
5th Congress of Plastics Converters
quantec® Kneader for XLPE
Advantages of Kneader:
-
10.11.2011 / KF
Injection of peroxid or silane
via injection pins
Unique temperature control
for peroxide (< 130° C)
Excentrical die face pelletiser
for lowest back pressure
Up to MV XLPE quality can
be produced in one step
Most compact XLPE
production system
5th Congress of Plastics Converters
CP Kneader mixes Carbon Paste for Anodes
This Kneader series has
nothing to do with
plastic industrie.
It should just show our
biggest machine!
10.11.2011 / KF
5th Congress of Plastics Converters
Summary

The Buss Kneader is a compounding extruder with rotating-oscillating
screw interacting with static kneading pins in the barrel

This special working principle combines perfect dispersive and
distributive mixing with minimal heat up of the melt

Using a Buss Kneader is mainly advisable for temperature and shear
sensitive applications

For easy cleaning and quick maintenance all Buss Kneaders have a
split barrel design for opening

The kneading pins can be also effectively used for liquid injection into
the process chamber and for measuring exact melt temperature along
the barrel
10.11.2011 / KF
5th Congress of Plastics Converters
Contact Information
Buss AG
Hohenrainstr. 10
4133 Pratteln
Switzerland
Phone +41 61 825 66 00
Fax +41 61 825 68 58
info@busscorp.com
Dipl. Ing. (TH) Frank L. Knittel
Business Manager
Plastic Compounding Technologies
Phone +41 61 825 64 48
Mobile +41 795952331
Fax +41 61 825 66 88
frank.knittel@busscorp.com
10.11.2011 / KF
5th Congress of Plastics Converters