NOVA sT (180-500 tonnes)


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NOVA sT Servo Hydraulic Injection Molding Machine



Ergonomic • Efficient • Versatile

Features the MOTUS Controller

The NOVA sT Series are 5-point double toggle clamp, servo-pump hydraulic powered injection molding machines available in 180-, 250-, 330-, 400- and 500-tonne models.

An important feature of the Negri Bossi servo solution is the implementation of twin servo pumps (single on model ST180). Though not the least expensive solution, twin pumps allow simultaneous operation of functions such as ejector and core action during clamp movement, providing the benefits of servo technology without a reduction in machine performance. Energy efficiency was at the forefront of the design consideration and this has resulted in the inclusion of the very latest servo-pump technology, purpose built for the injection molding application.

NOVA sT Servo Hydraulic Injection Molding Machine

The injection unit features a reciprocating screw, with injection capacities from 268g to 4400g (PS) across the range. NOVA sT machines are equipped as standard with:

  • MOTUS, the first ‘True’ Multi touch Controller
  • Smart Flex clamping unit with generous tie bar spacing to accommodate larger molds
  • Moving platen that rides on linear bearings for excellent platen parallelism and reduced energy consumption
  • Long ejector strokes
  • Robust in-line swinging injection unit with quick release barrel
  • Highly efficient servo motor driven gear pump system
  • AMICO wireless remote service access




NOVA sT technical datasheet



  • 5-point double toggle clamp
  • Euromap or SPI platen configuration
  • Chrome plated tie bars
  • Linear bearings for moving platen guidance and support
  • Powered mold height control
  • Automatic central lubrication system by means of electric pump
  • Three‐stage mold closing speed profile
  • Three‐stage mold opening speed profile
  • Moving platen pre‐feed
  • Mold closing and opening stages governed through closed loop with proportional control valve
  • Digital reading of moving platen position displayed on operator interface
  • Mold thickness and clamping force self‐adjustment
  • Digital control and reading of cross‐head position on operator interface
  • Digital reading of clamping force displayed on operator interface
  • Two‐stage ejection speed profile
  • Ejection force control
  • Digital reading of ejector position displayed on operator interface
  • Repeated ejection with stroke and speed control
  • Ejector proportional speed control, with overlapped movement at opening, models ST250 to ST500 (Optional on model ST180-850)
  • Ejector return signal
  • Freely-programmable multiple core pulling control

NOVA sT Injection Unit



  • Injection unit with in-line hydraulic cylinder
  • Injection unit sliding on linear bearings
  • Swiveling injection unit for easy plasticizing screw removal and cleaning
  • Quick barrel change system
  • General purpose screw profile, suitable for most types of thermoplastic materials
  • Bimetallic barrel
  • Nitrided screw
  • Injection unit driven by two cylinders to assure perfect nozzle centering
  • Ceramic heater bands
  • Alarm threshold for set temperature range
  • Injection speed and pressure profiles
  • Switch to holding pressure triggered by screw position, hydraulic pressure or time
  • Digital reading of screw position displayed on operator interface
  • Adjustable screw rotation speed profile
  • Screw rotation delay
  • Adjustable back‐pressure profile
  • Digital reading of back‐pressure displayed on operator interface
  • Decompression before and after screw recovery
  • Intrusion molding program
  • Auto purge program
  • Stainless steel hopper



  • NOVA sT Hydraulic SystemSingle fixed displacement gear pump with servo motor and Baumuller drive with P/Q control (model ST180-850 only)
  • Two fixed displacement gear pumps with servo motor and Baumuller drive with P/Q control (models ST250 to ST500)
  • Overlapped ejector movement during opening (models ST250 to ST500)
  • Optional second servo pump to allow simultaneous movements and valve gate operation during injection (model ST180-670 only)
  • Optional second servo pump to allow valve gate operation during injection (models ST250 to ST500)
  • Digital reading of hydraulic circuit pressure displayed on operator interface
  • Monitoring of oil level, temperature and filter blockage
  • Oil temperature control system
  • Automatic cooling water shut-off valve
  • Oil preheating program
  • Oil filter in pump delivery and/or return circuit
  • Oil cooling heat exchanger
  • Oil gauge



  • Servo drive
  • Remote starter with overload cutout
  • Interlocked main switch to prevent electrical cabinet from being opened when press is energized
  • Fuses and static relays that control plasticizing cylinder heating
  • Fan for air circulation in electrical cabinet
  • LED indicators on solenoid valves
  • Fully labelled electrical circuits
  • Conforms to Euromap or UL electrical standards



  • Flow meter with adjustable independent circuits with water temperature and flow rate indication (One circuit is used for throat cooling with the remaining circuits available for mold cooling)



  • Part discharge outlet accessible on three sides
  • Sound insulated motor‐pump assembly housing
  • Anti-vibration mounting pad holes
  • Lubricating oil recovery trough



  • Constructed in compliance to essential requirements of Machinery Directive 2006/42/CE and subsequent amendments
  • All models CE certified by a European certification organization
  • Devices comply to European Standard EN 201 and ANSI/SPI B151.1-2007
  • Rear mold protection with double interlocking device and pump drive motor shutdown
  • Monitoring of correct operation of hydraulic and electric safety devices
  • Interlocked nozzle purge guard



The NOVA range is equipped with MOTUS, the first ‘True’ Multi touch Controller. Features include:

  • Innovative gesture navigation system incorporating swipe, scroll & zoom functions.
  • Virtual object for axis movement based on gesture orientation (Patent Pending).
  • Smart, slim design with smart phone familiarity.
  • Customizable interface to personalize screen and functions.
  • Sequencer to create special cycles
  • Quick search function for parameter editing, graphical editing and analysis
  • New functioning modes, “step” and “in production”.
  • Smart alarms function for improved fault management
  • 5” Color TFT LC multi-touch display with a 1920X1080 resolution.
  • Power Link bus connections based on Real time Ethernet technology.
  • Data transmission is safe, noiseless and faster with < 2 ms communication speeds.
  • RFID (Radio-frequency identification) for external access.

Servo Pump System


Servo Pump SystemThe NOVA sT is powered by a servo-motor driven gear pump system, using the very latest technology from renowned component suppliers such as Rexroth and Baumuller. The benefits of this system are many and offer a much greater overall efficiency, the most important of which are:

  • Improved process control reduces reject levels
  • Lower power consumption results in a lower cooling requirement
  • Much less noise for a better working environment
  • Longer oil life, longer lasting hydraulic components and reduced maintenance

These performance enhancements combine to produce a more profitable molding process for the owner. This arrangement, coupled with special energy optimizing software from Negri Bossi, provides the user with excellent energy efficiency, reduced power consumption, and a more profitable manufacturing process.

NOVA ST Energy Consumption Chart 1

An analysis of energy consumption during the various phases of a typical molding cycle shows that the servo pump solution produces a superior result, when compared to more traditional hydraulic power systems. The following is one example showing how the NOVA sT provides the customer with important savings in energy usage.

NOVA ST Energy Consumption Chart 2

Noise levels are much reduced, producing an improved working environment.



  • Core Pull MP/FP
  • Air Blast MP/FP
  • Proportional Valve for Hydraulic Ejection
  • Second servo pump to allow simultaneous movements and valve gate operation during injection (model ST180-670 only)
  • Second servo pump to allow valve gate operation with maintained pressure during injection (models ST250 to ST500)
  • E67 Robot Interface
  • Special Screw (Wear Resistant, Corrosion Resistant, Mixing, Barrier, Low Compression, etc.)
  • Special Barrel (Corrosion Resistant, High Wear Resistant)
  • Barrel Liner
  • Special Tip Design
  • Extended Nozzle Body
  • Additional Nozzle Zone
  • Mold Valve Gate Hydraulic
  • Mold Valve Gate Pneumatic
  • Hydraulic Shut-Off Nozzle – Pin
  • Hydraulic Shut-Off Nozzle – Bolt
  • Transformer(s)
  • Integrated Hot Runner
  • Mold Pressure Transducer Interface
  • Gas Injection Interface
  • Data Logging Interface
  • RJG Process Monitoring Interface
  • Special Paint
  • Additional Flowmeters
  • Closed Loop Feed Throat Cooling
  • 100 mm Increased Mold Height
  • PVC Kit
  • Thermoset Kit
  • LSR Kit
  • FMC® Kit*
  • Power Outlet(s)
  • Color Feed Signal
  • Photocell
  • Directional Parts Chute
  • Electric Screw Drive
  • Injection Accumulator
  • Magnetic Platens
  • Hydraulic Mold Clamps
  • Rotary Table
  • AMICO System Services


NOVA sT END MARKET APPLICATIONS NOVA-Secondary-Product-Collage-500x250px

  • General Small Size Parts
  • General Medium Size Parts
  • Automotive
  • Construction
  • Industrial
  • Appliance
  • Household
  • Aerospace
  • Electronic & Telecomm
  • Technical Molding
  • Packaging
  • Food & Beverage
  • Containers
  • Closures