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15 th Birthday of STS Extruders: Coperion Adds New Laboratory Extruder to the STS Series

The STS twin screw extruder from Coperion is celebrating its 15th
birthday this year. Thanks to the ongoing technological and design development, the STS
extruder has proven itself today as a strong performing quality product for numerous
compounding processes on the market. Just in time for this anniversary, Coperion has
expanded the STS series by one more extruder size: The new STS 25 Mc 11 extruder with a 25
mm screw diameter is designed especially for research and development tasks as well as for
production of small batch sizes of 2 kg and more, achieving throughputs of up to 80 kg/h. It will
be shown for the first time at Chinaplas 2019 (21-24 May 2019, Guangzhou, China) at the
Coperion booth 5.1M11 in Hall 5.1.

STS Extruder Now in Laboratory Size
Completely new and available to view for the first time at this year’s Chinaplas is Coperion’s
STS 25 Mc 11 extruder with a 25 mm screw diameter. It boasts all the advantages of the STS
Mc 11 series, has a simple design, is operator-friendly and easy to clean. Its feed barrel is
equipped with an exchangeable sleeve insert to facilitate cleaning. In addition the die head is in
quick-release design for easy operation and accelerates product changes again. The base
frame has a closed, simple to clean surface and is equipped with castors for easy movement of
the extruder and fast installation. Water cooling, vacuum unit and air supply can be integrated
into the base frame as an option.

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For maximum efficiency and energy savings Coperion has equipped the new STS 25 Mc 11
extruder with cartridge heaters for precise single zone tempering of each individual barrel. By
having the same screw diameter ratio D o /D i (outer screw diameter to inner screw diameter) of
1.55 and the same maximum specific torque Md/a³ of 11.3 Nm/cm³ as the whole STS Mc 11
extruder series, production parameters of the STS 25 Mc 11 can be reliably scaled up to larger
STS sizes which makes it the ideal compounding system for recipe development and basic
scientific research. The STS 25 Mc 11 which Coperion will exhibit at Chinaplas will be shown with
the highly accurate Coperion K-Tron twin screw feeder K-ML-SFS-KT20.

15 Years of the STS Twin Screw Extruder
15 years after its introduction, the STS systems from Coperion serve as reliable high-
performance extruders for a variety of applications, primarily in plastics compounding. When the
first model of this extruder type was delivered in 2004, the STS twin screw extruder was
equipped with a torque of 8.7 Nm/cm³ and achieved screw speeds of up to 600 min -1 .
Throughput was limited to 1,200 kg/h with the then-largest machine size, the STS 75 with a 75
mm screw diameter. At that point, rapid development of the STS extruder series’ technology,
design and quality followed which was barely imaginable for the time. In 2008, the STS
advanced with specific torque of 10 Nm/cm³ and screw speeds up to 800 min -1 launched
successfully. Today’s high-performance, high-quality STS Mc 11 was introduced to the market in
2015 and has set new standards. It has a maximum specific torque of 11.3 Nm/cm³ and screw
speeds of up to 900 min -1 . In its largest extruder size, the STS 96 Mc 11 , today throughputs of up
to 4,200 kg/h are achieved. Screw elements and barrels are available in various materials from
standard versions to highly wear and corrosion resistant solutions, individually tailored to
applications’ requirements and high throughput rates. The screw diameter ratio D o /D i of the STS
extruder is 1.55, which is the same ratio that Coperion uses for numerous ZSK extruders and
that has proven itself for an optimal combination for most plastics processing applications. The
STS Mc 11 extruder is equipped exclusively with high-quality Coperion-brand gearboxes
manufactured in Europe. STS Mc 11 is produced at Coperion in Nanjing, China, in accordance
with CE guidelines and the highest Coperion standards of quality, and is distinguished by its
very attractive price-to-performance ratio.

Originally the STS extruder was mainly applied for the modification of engineering plastics and
masterbatch. After 15 years of continuous process technology development, today the STS
extruder series proves itself successful in compounding of engineering plastics, masterbatch,
powder coating, cable masses, recycled plastics, regrind and much more. From 2004 to 2018

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700 STS extruders have been installed all over the world, achieving Coperion’s historical record
with over 100 STS extruders sold in 2018.

Highest Quality Standards in STS Production
The incomparable development of the STS extruder series to become a best quality high-
performance extruder was made possible in part by implementing strict manufacturing controls
at Coperion’s Nanjing location over the last few years. Coperion Nanjing uses German
machining centers with state-of-the-art technology and has long implemented proven Coperion
standards to ensure high-quality production. The manufacturing process is closely supervised
using highly accurate, complex German machines and equipment components for production
and quality measurement. The Coperion factory in Nanjing, meanwhile, is now delivering the
same high standards of quality for which Coperion Stuttgart is known.

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