While selecting injection moulding machine the following specifications are required to be evaluated.
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INJECTION UNIT |
To understand |
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Maximum swept volume cc / max. shot weight gr. |
calculation of max. shot weight for a material. |
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Maximum metering stroke in mm. |
dependance of quality of melt for consistancy of moulding. |
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Maximum injection speed g/s or cc/s |
how it ensurs melt to spread through out when in fluid condition- before it freezes. Its relationship with freezing time. |
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Maximum injection pressure Kg/cm2 |
how it overcomes resistance to flow during filling and; pressure phase on account of flowratio and; viscosity. |
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Maximum Injection Power.Kgcm/sec. |
how it takes care of difficulty in fiiling for thiner walled and high flow ratio parts. |
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Plasticizing rate g/s or Kg/hr. |
how it influences cycle time. |
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CLAMPING UNIT |
To understand |
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Clearance between Tiebars and platen size mm x mm |
how it accomodates mould. |
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Maximum daylight mm and mould open stroke mm |
its significance for ejection of deep parts. |
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Minimum mould height |
its relationship with mould open stroke and daylight. |
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Clamping force |
its dependance on cavity pressure and method to compute cavity pressure. |
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HYDROMOTOR |
To ubderstand |
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Torque Kgm and rpm |
torque requirement for -viscosity of- melt. |
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DRIVE POWER |
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Power supply frquency 60 or 50 Hz. |
its influence on speeds. |
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Pump-motor rating. kW |
to match the application - usage of machine. |
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CONTROLS |
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NO LOAD CYCLE TIME |
It indicates the time for non processing part of the cycle time |
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