Injection Molding Machine

Injection Molding Machine range

5 models, each linked to its full specification page.

How to choose Injection Molding Machine

Decide first what you will mould. PET preforms for blow-moulded bottles need a machine built for PET, which is dried before moulding and processed at higher temperatures; the Preform Injection Molding Machine and the Injection Molding Machine for PET preform belong here. Screw caps and closures are usually moulded from polyolefins at high speed in multi-cavity moulds, which is the job of the Bottle Cap Injection Molding Machine and Plastic Bottle Cap Injection Molding Machine. Crates, buckets, tubs and technical parts use a general-purpose machine such as the Injection Molding Machine of Plastic.

Then size the machine to the mould, not the other way round. The mould's projected area and the resin set the clamping force; the part weight times cavities sets the shot size; the mould dimensions must fit between the tie bars with enough opening stroke to eject the part. If you do not yet have a mould, decide the part design and cavity count with your mould maker first, then choose the machine. Energy-saving drives, which vary pump output with load, are worth considering for continuous cap and preform production.

Specifications and standards

Compare clamping force, shot weight or injection volume for your resin, screw diameter and L/D ratio, injection pressure, distance between tie bars, mould thickness range, opening stroke, dry cycle time, installed heater and motor power, and the number of stored mould settings (one cap model lists 120). For PET, check that the screw and barrel are designed for PET and that a dryer and dehumidifier are included or specified.

Ask for electrical safety and guarding documentation suited to your market, including interlocked safety gates. Request a test moulding report with your mould or a comparable one, showing cycle time and part weight consistency. If preforms or caps will contact beverages, confirm with your resin and mould supplier that materials meet the food-contact rules in your market; the machine itself does not certify this.

Who buys this range

Buyers are bottled water and soft drink producers who want to make their own preforms and caps instead of buying them, packaging converters supplying several bottlers, edible oil and dairy companies moulding closures, and plastics workshops making household and industrial items. Water bottlers often buy a preform machine alongside a blow moulder and filling line to control container supply.

Purchases are usually direct, with the buyer specifying the part and mould, or comparing machine and mould offers as a package.

Machine, mould and auxiliaries as one package

An injection moulding machine cannot produce anything without a mould, and most also need auxiliaries: a resin dryer for PET, a chiller for mould cooling, a hopper loader and often a robot or conveyor for part removal. Budget for all of these together. The mould is frequently the most expensive and longest lead-time item, so order it early and make sure its dimensions, ejection system and cooling connections match the chosen machine.

Energy use in continuous production

Cap and preform machines often run around the clock, so electricity is a major running cost. Machines with variable-output pump drives use less energy at part load than fixed pumps, and well-insulated barrel heaters reduce heat loss. Ask for the installed power and an estimate of consumption per kilogram of moulded resin, and compare machines on that basis rather than purchase price alone.

Frequently asked questions

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