Lower wear, higher output
36D Double-Venting Extruders
New-generation 36D extruders improve
the economics of PVC pipe extrusion
Krauss-Maffei's new double venting
extruders offer 6 major benefits that can
boost profit margins in pipe extrusion:
Atmospheric
venting
– 17 % higher output compared with
26D machines
Vacuum degassing
– Effective and reliable degassing even
of highly filled materials
– Cost savings from extended service life
for the processing unit, higher output
and less load on the gear system
– Wide processing window for different
formulations
36D processing unit
– Lower compression ratio than 26D
extruders in the high compression
phase
– Less wear on screws and barrel
36D twin-screw extruder
with double venting
Double venting – the
new processing technology
Our new 36D extruders are not simply
machines with the processing unit
extended from 26D to 36D. On the
contrary, our 36D machines represent
a new departure in PVC processing.
The standard design for conventional
counter-rotating, closely intermeshing
twin-screw extruders has one venting
zone. The new 36D extruders have two
venting zones. The new design has
some convincing benefits.
Less wear, lower costs
Especially in pipe extrusion, a lower
compression ratio sharply reduces wear
on screws and barrel, most noticeably
in processing highly filled material.
You'll see a positive effect on your
cost calculations.
Krauss-Maffei's 36D double-venting
design offers all the benefits that go
with highly effective degassing and
lowest possible wear.
Modular options
■
■
Problem: Trapped air
In conventional extruders, a considerable volume of air is drawn into the
feed zone along with the dryblend.
This air acts as an insulator, preventing
the optimal amount of heat reaching
the PVC from the screw and barrel.
An additional problem with highly filled
formulations is the risk of turbulence
when the air is subsequently extracted
in the venting zone.
Solution: Two venting zones
With our new 36D extruders, the
compressed and prewarmed dryblend
reaches the first venting zone at 15D.
Here atmospheric venting takes place:
air is allowed to escape from the stillpowdery, but compressed, material
via two long apertures in the barrel.
At this stage venting is atmospheric.
The PVC is then compressed further
before it reaches the second venting
zone. In the second venting zone,
the remaining volatile components
are removed by means of a vacuum
extraction system, as in conventional
twin-screw extruders.
■
Benefits: Lower compression
ratios, higher output
A 36D machine with double venting
is clearly superior to a 26D machine.
It allows processing with significantly
lower compression ratios in the highcompression phase. And output
increases at the same time.
We offer different versions:
– Air- or oil-cooled barrels
– Processing direct from the hopper
(standard) or with metering system
Technical data
KMD
75 -36
KMD
90-36
KMD
114 -36
KMD
133 -36
Drive rating [kW]
51
69
107
150
Installed torque max. [Nm]
9 400
15 000
30 000
48 000
Screw rpm max. (min -1)
49
41
32
28
Screw L/D ratio
36
36
36
36
Output max. [kg/h]
490
700
1 050
1 400
Screw heating/cooling
Internal
Internal
Internal
Internal
Two geometries available:
for apparent density 600 - 650 g / l or 700 - 750 g / l
Machine dimensions [mm]
Length
4 790
5 840
7 130
8 020
Width
1 280
1 400
1 400
1 550
Height
2 495
2 545
2 585
3 635
Worldwide service and support
Injection Moulding Technology
Reaction Process Machinery
Extrusion Technology
Pipe extrusion
Profile extrusion
Sheet extrusion
PVC pelletizing
Wherever you are in the world, you can
rely on the Krauss-Maffei service team.
A phone call to one of our experienced
engineers will get you fast support with
troubleshooting, or remote diagnosis to
sort out the problem via direct access
to the Krauss-Maffei control system on
your machine. When a problem has to
be dealt with on-site, a service engineer
will get to you without delay.
Krauss-Maffei sales and service centres around the world
• Krauss-Maffei headquarters in Munich
• Subsidiaries
• Agencies
Krauss-Maffei Kunststofftechnik GmbH · Krauss-Maffei-Strasse 2 · D-80997 Munich · Germany
Phone +49/89/88 99-0 · Fax +49/89/88 99-40 43 · www.krauss-maffei.com/ext
Krauss-Maffei U.K. Ltd.
Europa Boulevard
Gemini Business Park
Warrington WA5 5TR
United Kingdom
Phone +44/19 25/64 41 00
Fax
+44/19 25/23 42 84
Krauss-Maffei
France SAS
5, Allée des Barbanniers
92632 Gennevilliers Cedex
France
Phone +33/1/46 85 25-08
Fax
+33/1/46 85 25-49
Krauss-Maffei Plastics Machinery
(Shanghai) Co. Ltd.
Grd. Fl., Part D1, Bldg. No. 44,
Plot D12, No. 207 Tai Gu Rd.
Wai Gao Qiao Free Trade Zone
Pudong New District
Shanghai 200131, P.R. China
Phone +86/21/58 68-04 60
Fax
+86/21/58 68-04 63
Krauss-Maffei do Brasil Ltda.
Rua Canto e Melo, 210
04756-100 São Paulo-SP
Brazil
Phone +55/11/56 41-22 73
Fax
+55/11/56 41-93 37
Krauss-Maffei Corporation
7095 Industrial Road
P.O. Box 6270
Florence, KY 41042-6270
USA
Phone +1/859/28 34-316
Fax
+1/859/28 30-290
Krauss-Maffei
Italiana S.r.l.
Via Giovanni XXIII 77/B
25086 Rezzato (BS)
Italy
Phone +39/030/25 90 707
Fax
+39/030/25 92 369
Krauss-Maffei
Asia Pacific Pte. Ltd.
23 Tagore Lane, 04-15
Singapore 787601
Phone +65/65/53-58 28
Fax
+65/64/55-04 19
1.0 We · 4th edition 09/04 · Printed in Germany · Printed on 100% chlorine-free bleached paper · EXT 017 09/2004 GB
Our network of strategically-located
service centres is expanding year by year,
making sure staff and spare parts get to
you fast and efficiently, whenever and
wherever you need them.