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For any additional information on STEER’s ALPHA SERIES do write to us at info@steerworld.com or you can contact our key representatives depending on your location.

Brochure for ALPHA Series

THE RELIABLE WORKHORSE — STEER’S ALPHA 1.49 DO/DI
CO-ROTATING TWIN-SCREW MATERIALS PLATFORM

Overview

Features

Series Technical Specifications

STEER’s ALPHA series twin-screw materials platforms are a popular choice amongst compounders looking for an all-in-one performer. Developed with a 1.49 Do/Di, these co-rotating twin-screw platforms are robust, reliable and perfectly suited for round the clock production. They deliver exceptional results for both general compounding applications as well as advanced applications.

 

SERIES HIGHLIGHTS

 

  • High efficiency
  • High safety
  • High throughputs
  • Suitable for round the clock production

#1. PATENTED ‘FRACTIONAL-LOBE’ DESIGN SCREW GEOMETRY

 

The ALPHA SPECIAL PLATFORM is built using the revolutionary ‘Fractional-Lobe’ geometry, replacing the conventional integer-lobe design. This design eliminates shear peaks and ensures a uniform transfer of energy to the materials being processed, giving the capability and the control to work with sensitive materials. Besides, it reduces the energy consumed considerably, while improving overall quality.

#2. PATENTED SPECIAL ELEMENTS – ENHANCED PROCESS EFFICIENCY

 

Purpose-built with a thorough understanding of mixing, special elements help overcome difficulties arising in advanced applications. Whether it is higher intake or side-feed capacity, greater forward conveying ability, extensional flow or better wetting action and improved flow distribution, our special elements are built to enhance efficiency.

 

#3. STEER CONTINUA SPLINE

 

continua-spline ost commonly used shaft splines are involute, circular or straight increasing the stress concentration and causing severe damage to the expensive screw shaft, the screw elements and the gearbox during a surge in torque. The STEER Continua Spline design, made of high alloy steel, reduces stress concentration. It has a shaft adaptor with circular rupture grooves. During a surge, only the shaft adaptor breaks at the groove preventing damage to the shaft, the elements and the gearbox.

#4. STEER HITORQ GEARBOX

 

The STEER Gearbox is of a watch case design with a housing of multiple chambers, made of high grade casting, and uses hardened and ground gears of DIN5/DIN6. While most gearboxes without hardening, develop play and have to be used at reduced speed and torque, STEER Gearboxes are built for the fast lane with their ability to transmit higher torque, minimal axial play, minimum backlash and equal angular deflection, allowing for improved process capability applications.

#5. STEER BARRELS – CRAFTED TO PERFECTION

 

barrelsSTEER barrels have cooling circuits that cool uniformly, increasing the overall efficiency of the entire process. Made with the right metallurgy, they have supreme resistance to various types of wear and come with supports designed with cross roller guides or ‘v’ guides that allow for a sliding movement of about 15mm. The ‘u’ bracket on which the barrel rests has minimum contact surface to reduce the heat transfer from the barrel to the slider and support column, further increasing efficiency.

#6. STEER SIDE FEEDERS

 

STEER side feeders allow you to add new materials such as fillers, reinforcements, sensitive impact modifiers, pigments etc into the melt. They become important when split feed is essential due to the volumes of feed materials. The STEER side feeder can also be used for devolatizing applications through side-venting. The side feeder is height adjustable within a range and portable as castor wheels are fitted to it. STEER side feeders assure high consistency and precise dosing into the extruder, besides being completely noiseless.

#7. STEER SPECIAL TOOL STEEL – THE RIGHT METALLURGY FOR LONGER LIFE

 

STEER uses only special grades of tool steel, with high wear and corrosion resistance, developed in our state-of-the-art foundry. Our ACROLLOY series, a vanadium rich tool steel with alloying and micro- alloying elements, and characteristics of Wootz steel, works against the forces of abrasion, wear and corrosion. With ACROLLOY, our platforms and elements are capable of withstanding the most difficult applications.

#8. THE STEER HUMAN MACHINE INTERFACE

 

The STEER Human Machine Interface helps users control and monitor the extruder and peripherals through advanced communication links and protocols. The drive is controlled from a touch screen which operates through Programmable Logic Controllers (PLCs). STEER allows for customisation of the HMI screens, integration of peripherals, other plant utilities and material system to achieve complete plant automation. The software used by STEER is highly reputed and used by some of the largest companies around the globe.

STEER’s ALPHA SERIES is also available in different variants to suit different compounding needs;

  • ALPHA SERIES

    Some key performance features include –

     

    • Color Masterbatches
    • Thermoplastic Elastomers / Vulcanizates
    • White Masterbatches
    • Mineral Filled Compounds
    • Highly filled Masterbatches
    • Black Masterbatches
    Sl No. Extruder Model Screw Diameter (mm) Power (kW) Screw Speed (rpm) Nominal Torque per shaft (Nm) Specific Torque (Nm/cm3)
    1 Alpha 18 18.5 7.5 1200 30 7.3
    2 Alpha 25 24.5 18 1200 72 7.7
    3 Alpha 30 28 37 1200 147 10.6
    4 Alpha 40 37.5 90 1200 360 11.0
    5 Alpha 50 47.5 181 1200 720 11.3
    6 Alpha 60 56.5 377 1200 1,500 13.6
    7 Alpha 70 70 686 1200 2,730 13.6
    8 Alpha 80 80 1030 1200 4,100 13.6
    9 Alpha 90 90 1257 1000 6,000 13.6
  • ALPHA S CLASS

    Applications –

     

    • Mineral Filled Compounds
    • Thermoplastic Elastomers / Vulcanizates
    • Color Masterbatches
    • Polymer Blends, Melting
    • PP Talc Automotive
    • Homogenizing
    • Highly filled Masterbatches

     

    Sl No. Extruder Model Screw Diameter (mm) Power (kW) Screw Speed (rpm) Nominal Torque per shaft (Nm) Specific Torque (Nm/cm3)
    1 Alpha 30S 28 55 1200 220 15.9
    2 Alpha 40S 37.5 131 1200 520 15.9
    3 Alpha 50S 47.5 250 1200 995 15.5
  • ALPHA LAB

    Applications –

     

    • Mineral Filled Compounds
    • Thermoplastic Elastomers / Vulcanizates
    • Color Masterbatches
    • Polymer Blends, Melting
    • PP Talc Automotive
    • Homogenizing
    • Highly filled Masterbatches
    Sl No. Extruder Model Screw Diameter (mm) Power (kW) Screw Speed (rpm) Nominal Torque per shaft (Nm) Specific Torque (Nm/cm3)
    1 Alpha 18 18.5 7.5 1200 30 7.3
    2 Alpha 25 24.5 18 1200 72 7.7
    3 Alpha 30 28 37 1200 147 10.6

* Varies based on application

ABOUT STEER

 

STEER co rotating twin screw extruder is the creator of advanced materials platform technology that effectively transforms and functionalises materials in the field of plastics, pharmaceuticals, food & nutraceuticals, biomaterials and biorefining.

Certification

 

An ISO 9001 and 14000 certified company

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STEER INDIA

Tel:+91-80-23723309 / 10

+91-80-42723300

 

STEER JAPAN

Tel: +81-3-6206-4171

 

STEER AMERICA

Tel: +1-866-984-1800

 

STEER CHINA

Tel: +86-021-34718598

 

STEER EUROPE

Tel: +44 2032904949

 

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