maXXimum Flexibility for Every Application

LEISTRITZ EXTRUSIONSTECHNIK GMBH
F E A T U R E S
maXXimum
Flexibility

maXXimum Flexibility
for Every Application
Modular Screw System
Leistritz offers an extensive system of screw elements, which can be combined in an almost unlimited
number of variations. Basically, there are conveying, kneading and melting/mixing elements. In order
to work out the ideal design of the screw geometry for each application, the know-how of the process
engineer is of utmost importance.
Modular Barrel System
A modular screw geometry requires a modular barrel design for the processing unit. Leistritz offers
barrels with a multitude of openings and inserts for material feeding, degassing and venting. In this
way, an optimum coordination between barrel and screw is possible. Electrical heating cartridges and
a revolutionary, flow-optimized cooling concept (maXXcooling) assure the effective heating/cooling of
the ZSE MAXX barrels.
Best Materials for Every Application
To maximize machine availability, it is important
to select the appropriate screw and barrel materials.
For this reason, Leistritz offers an extensive
range of material combinations to achieve optimum
corrosion and wear protection to suit the
processing tasks.
Barrel wear protection is often done by means
of liners, whereas screws can be manufactured
from powder metallurgical steel.

maXXimum Flexibility
for Every Application
Producing Safety by Means of Optimum Wear Protection
The Leistritz group is continuously on the quest for new materials. Due to its wide range of in-house
manufactured product groups, Leistritz has a profound material know-how. This can hardly be
matched by other companies. No wonder, if you think, that for the past 100 years Leistritz has offered
products, which have to satisfy highest standards:
Turbine blades for turbines in airplanes and rockets
Screw pumps on off-shore oil rigs for the conveying of oil-sand-gas-composites
Extrusion lines for the production of metal compounds or pharmaceuticals
... only to mention a few examples, which show the extreme diversifi cation of products.

maXXimum Flexibility
for Every Application
VSA1
VSA2
VSA3
VSA4
VSK1
high
medium
very high
Wear Protection
Abrasion Corrosion
low
none
low
medium
high
very high
Application
standard applications max. 20%
fillers, no glass fibre GF
. 20% filler
% 30% GF, special applications
pharma & food
applications
. 20% filler
. 30% GF, special applications
special applications with high
corrosion
The question of wear resistance is one of the most significant criteria for determining the materials of
the processing unit. Especially, when working with highly abrasive products such as glass fibres and
mineral fillers or corrosive materials such as acid, the right selection of materials is essential.
Basically, the processing unit has to be protected against three kinds of wear mechanisms:
Corrosion (chemical, product/extruder)
Abrasion ( mechanical, product/extruder)
Adhesion (screw/barrel)
For the proper selection of the manufacturing material, the combination of product, screw and barrel
system has to be put into optimum balance. Consequently, it is not possible to combine any kind of
material with the other. Using liners or monoblock barrels (e.g. induction hardened or with PM layers)
is another strategy, which is frequently applied to adapt the processing unit to the requirements of the
customers.
r e f r e s h i n g e x t r u s i o n t e c h n o l o g y
V_01_EN / 0910.07