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                Highly constructed and simple to clean – these are the visible characteristics of the new STS 25 Mc<sup>11</sup> laboratory extruder; among its inner values are torque from 11.3 Nm/cm3 and screw speeds of up to 900 min<sup>-1</sup>. (Image: Coperion, Stuttgart)
                Highly constructed and simple to clean – these are the visible characteristics of the new STS 25 Mc11 laboratory extruder; among its inner values are torque from 11.3 Nm/cm3 and screw speeds of up to 900 min-1. (Image: Coperion, Stuttgart)

                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 Mc11 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.

                STS extruder now in laboratory size

                The new STS 25 Mc11 extruder boasts all the advantages of the STS Mc11 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.

                For maximum efficiency and energy savings Coperion has equipped the new STS 25 Mc11 extruder with cartridge heaters for precise single zone tempering of each individual barrel. By having the same screw diameter ratio Do/Di (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 Mc11 extruder series, production parameters of the STS 25 Mc11 can be reliably scaled up to larger STS sizes which makes it the ideal compounding system for recipe development and basic scientific research.

                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 Mc11 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 Mc11, 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 Do/Di 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 Mc11 extruder is equipped exclusively with high-quality Coperion-brand gearboxes manufactured in Europe. STS Mc11 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.

                For more information please visit:www.coperion.com/stsmc11.

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