Miniature Plastic Molding (MPM) is a top injection molding machine manufacturer known for its affordability and efficiency.
MPM’s Mini-Jector Machines are available in pneumatic, hydraulic or electric models, with either plunger or reciprocating screw type plasticizing systems. All Mini-Jectors may be used with a wide range of thermoplastics, ceramics and various investment waxes.
The low price of the Mini-Jector, combined with its low tooling costs, makes small production runs of 100 pieces as economically efficient and practical as runs of much larger quantities.
What Can Injection Molding Do?
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SEISMIC CABLE OVERMOLDING
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COLOR MIX TESTING
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TRADITIONAL ASTM TENSILE SPECIMENS
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PROTOTYPES OF NEW OR TRIAL PARTS
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INSERT MOLDING OR OVERMOLDING
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EDUCATIONAL PROGRAMS
Mini-Jector Model #45
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- Requires only 115 or 220 VAC 1 Phase supply
- One (1) high capacity heating cylinder
- Plunger assembly choice of bore sizes
- 0.33 ounce to 3.0 ounce “shot” size
- Non-drool nozzle
- Straight orifice nozzle (0.125” diameter) also available
Pneumatic System
- One (1) 8”x6” air cylinder or optional multi-stage cylinder for higher injection pressure
- Air filter regulator unit to be used with customer’s air supply
- 125 PSI maximum operating pressure
- One (1) solenoid operated directional valve
- Valve is pre-lubricated and does not require air supply lubrication
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Heating System
- One (1) 1050 watt cylinder heater
- One (1) 150 watt nozzle heater
- Two (2) 1/16 DIN pyrometers with auto-tune feature to control cylinder and nozzle heaters
Additional Features
- Aluminum material hopper with dump tube and shut-off
- Self compensating automatic material feed system
- NEMA 12 electrical enclosure with external pushbuttons
- Controls for manual or semi-automatic operation
- Digital injection timer
- Safety shroud covering all moving parts
- Optional C-Frame version available
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Mini-Jector Model #50
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- One (1) high capacity heating cylinder
- Plunger assembly choice of bore sizes:
- 0.33 ounce to 3.0 ounce “shot” size
- 230 VAC single or three phase power supply options
- Sliding ring shut off tip with “non-drool” shut-off nozzle
- Straight orifice nozzle (0.125” diameter) also available
Hydraulic System
- Self contained hydraulic power unit
- 5.4 gallon reservoir
- 2 HP pump motor
- 2.0 GPM pump
- One (1) 2” x 6” hydraulic cylinder
- Remote relief valve to control injection pressure
- Solenoid operated directional valve for ram (plunger) movement
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Heating System
- One (1) 1050 watt cylinder heater
- One (1) 150 watt nozzle heater
- Two (2) 1/16 DIN auto tune pyrometers that control cylinder and nozzle heaters
Additional Features
- Aluminum material hopper with dump tube and shut off
- Automatic self compensating feed system
- Thermal overload breaker for heater
- Control system with circuitry for manual or semi-automatic operation
- Includes digital injection timer
- All moving parts covered by safety shroud
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Mini-Jector Model #55
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- Accommodates mold to 5.5″H X 8.5″L X 6.0″W
- 230V single phase & 230 / 460 V three phase power
- Reciprocating screw with 2.5:1 ratio and flame hardened flights
- Screw assembly choice of bore sizes:
- 7/8” – max shot size: 1.00 ounce
- 1 1/16” – max shot size: 2.00 ounces
- 1 3/8″ – max shot size 4.00 ounces
- Nitralloy screw barrel
- Sliding ring shut off tip with “non-drool” shut-off nozzle
- Direct hydraulic drive screw
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Control System
- Directional valves with plug-in connectors that control:
- Screw speed
- Injection pressure
- Injection speed
- Screw back pressure read on oil filled gauge
- Timers for overall cycle and injection forward time
- Full manual controls
- Motor starter with thermal overloads and emergency stop button
- Vernier adjustment for shot size
- Selectable 1/4” de-compression feature
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Hydraulic System
- Two injection cylinders
- One carriage cylinder
- Self contained hydraulic power unit features:
- 5.4 gallon reservoir
- 1725 RPM motor with 2 HP
- 2.0 GPM gear pump immersed in the reservoir
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Heating System
- One nozzle heater
- Two barrel heaters
- Three 1/16 DIN auto tune pyrometers that control front, rear, and nozzle heat zones
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Additional Features
- Aluminum material hopper with shut off and dump tube
- Moving parts covered by safety shroud
- Heat shield on barrel
- Greaseless bushings used in screw unit mechanism
- Provision for cooling feed throat
Mini-Jector Model #55-1E
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- 230V single and three phase phase power options
- 7/8” diameter reciprocating screw with 2.5:1 ratio and flame hardened flights
- Nitralloy screw barrel
- Sliding ring shut off tip with “non-drool” shut-off nozzle
- Drive screw powered by Mitsubishi Servo with 25:1 Shimpo Gearbox
- Twin injection screws powered by Mitsubishi Servo with 15:1 Gearbox
- Carriage screw powered by Mitsubishi Servo with 81:1 Gearbox
- Mitsubishi MR-J3 B series servo amplifiers
Heating System
- One nozzle heater
- Two barrel heaters
- Four channel analog temperature control with solid state relay output
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Control System
- Mitsubishi Series PLC control
- Mitsubishi Color Touch Screen
- 5 step programmable injection profile
- On-screen position & velocity trending of injection
- Force and Temperature monitoring
- Data selectable English or Metric units
- Velocity is held within 0.02%
- Position is held within 0.001”
Additional Features
- Aluminum material hopper with shut off and dump tube
- Moving parts shielded by Lexan guarding
- Heat shield on barrel
- Integral hopper tube and bearing chiller system
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Mini-Jector Model #75
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Horizontal Injection, Vertical Clamp
- 12.5 ton hydraulic vertical clamp with 5.00” stroke
- Maximum daylight opening of 10.75” (without shuttle) and 10.00” with shuttle option
- 230V single phase and 230 / 460V 3-phase power options
- Parting line injection
- Reciprocating screw with 2.5:1 ratio and flame hardened flights
- Screw assembly choice of bore sizes:
- 7/8” – max shot size: 1.00 ounce
- 1 1/16” – max shot size: 2.00 ounces
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Hydraulic System
- Self contained hydraulic power unit features:
- 12.5 gallon reservoir
- 1725 RPM pump motor
- 6.0 GPM pump
- Hydraulic motor
- Hydraulic manifold features:
- Proportional relief valve and directional valves
- Mounted at rear of machine for easy maintenance
- Two (2) Sheffer injection cylinders
- One (1) Sheffer carriage cylinder
- Mold ejector cylinder with 2” stroke
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Machine Controls
- Mitsubishi PLC
- Touch screen operator interface
- Storage in control memory for 36 recipes and setups
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Safety Features
- Pneumatic safety gate
- Cycle started with two-hand anti tie-down buttons
- E-stop circuit is electrically, hydraulically, and mechanically interlocked
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Additional Features
- Aluminum hopper 13 lb. capacity with dump tube
- Mounting is provided for 5” x 8”, 6” x 8” shuttle bases plus MUD frames