While selecting injection moulding machine the following specifications are required to be evaluated.


INJECTION UNIT

To understand

Maximum swept volume cc / max. shot weight gr.

Calculation of max. shot weight for a material.

Maximum metering stroke in mm.

Dependence of quality of melt for consistency of moulding.

Maximum injection speed g/s or cc/s

How it ensures melt to spread throughout when in fluid condition- before it freezes. Its relationship with freezing time.

Maximum injection pressure Kg/cm2

How it overcomes resistance to flow during filling and; pressure phase on account of flow ratio and; viscosity.

Maximum Injection Power. Kgcm/sec.

How it takes care of difficulty in filling for thinner walled and high flow ratio parts.

Plasticizing rate g/s or Kg/hr.

How it influences cycle time.

CLAMPING UNIT

To understand

Clearance between Tie bars and platen size mm x mm

How it accommodates mould.

Maximum daylight mm and mould open stroke mm

Its significance for ejection of deep parts.

Minimum mould height

Its relationship with mould open stroke and daylight

Clamping force

its dependence on cavity pressure and method to compute cavity pressure.

HYDROMOTOR

To understand

Torque Kgm and rpm

Torque requirement for -viscosity of- melt.

DRIVE POWER

To understand

Power supply frequency 60 or 50 Hz.

Its influence on speeds.

Pump-motor rating. kW

To match the application - usage of machine.

CONTROLS

• Conventional / Proportional and Cartridge valve Hydraulic Controls
• Electrical / solid state / microprocessor controls
• Open loop or closed loop controls

NO LOAD CYCLE TIME

It indicates the time for non processing part of the cycle time



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