Blog
Guides and articles from Pratishna Engineers on choosing, sizing and buying injection moulding machines in India.
Household Articles Moulding Machines: Tonnage and Shot Weight Guide
Household articles moulding machine sizing: clamp from projected area and PP tonnage factor, shot weight from melt volume, and a worked basket example.
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Deep Container Moulds: Daylight, Ejector Stroke and Cycle Time
Deep container moulds: how much daylight and opening stroke you need, how far to eject, and where cycle time goes, with a worked pail cycle check.
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Caps and Closures Moulding on 140 to 320 Ton Machines
Caps and closures moulding on 140 to 320 t machines: mould size vs clamp, closure design, tethered caps, cooling and food rules, with a 48-cavity check.
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Thin-Wall Container Moulding on 140 to 320 Ton Machines
Thin-wall container moulding on 140 to 320 t machines: fill speed, pressure, clamp factor, barrel size, cooling and FSSAI rules, with a worked screw check.
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Container Making Machines: Injection Rate, Stroke and Tonnage
How to size a container making machine: injection rate for thin walls, opening stroke for deep parts and clamp force, with a worked tub example.
Read moreInjection Moulding Machine Upgrade: When to Move to a Container or Houseware Machine
Plan an injection moulding machine upgrade when clamp, shot, mould size or fill speed keep falling short. Signs, energy cost and a worked tub check.
Read moreGetting the Most From Multi-Cavity Moulds on 75 to 180 Ton Machines
Plan a multi-cavity mould for a 75 to 180 t machine: clamp per cavity, runner balance, cooling and hourly output, with a worked 4 vs 8 cavity check.
Read moreScrew Diameter Choice: Shot Weight vs Injection Pressure on 75 to 180 Ton Machines
Shot weight vs injection pressure: how screw diameter trades one for the other on 75 to 180 t machines, with a worked screw check for a thin-wall part.
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Injection Moulding Machine Tonnage Selection: Matching 75 to 180 Tons to Your Part
Injection moulding machine tonnage selection from 75 to 180 t: projected area, tonnage factor by resin, mould fit and a worked clamp check.
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100 Ton Injection Moulding Machine Running Costs: Power, Cycle and Output
Work out injection moulding machine running cost per part from power draw, cycle time and good-shot rate, with kWh per kg benchmarks and kVAh billing.
Read moreChoosing Between the 32 mm and 35 mm Screw on a 100 Ton Machine
How injection moulding screw diameter trades melt pressure for shot volume, with barrel-use limits, melt densities and a worked 32 mm vs 35 mm example.
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100 Ton Machine for Switch Plates and Electrical Accessories
How to size a switch plate making machine: clamp force per cavity, drying flame-retardant PC, wall thickness and flame ratings, and IS 3854 certification.
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