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Injection Molding - The Overview

posted on 21st March 2022, INJECTION MOULDING

Injection molding is indeed the best way to produce plastic products in bulk. Vastly appraised by engineers and manufacturing firms equally, injection moulding accelerates production while simply declining the manufacturing and selling cost. Result? Affordability, demand fullfillment and higher consumption.

What Is Injection Molding?

Injection Molding is a plastic product manufacturing process in which the parts are produced in bulk by injecting hot molten materials (polymers) into the mould. Ideally used in developing thousands and lacs of identical items for sale in the market. But the very first stage of injection molding itself is to create the mold first that needs the power of engineering.

Steps In Injection Molding Process

#Step1 - Clamping

Both halves of the mold have to be closed through clamping. Both halves of the mold are then attached to the injection machine. Because of the clamping unit, both the halves of the mold are held tightly while injecting the material.

#Step2 - Injection

Plastic resins are fed through hopper into the injection molding machine. The surrounding barrel with heat and pressure melts the plastic. The volume of material is called ‘shots’ and the injection time is over when 90-95% of the mold is filled. Injection time keeps on fluctuating, particularly based on pressure power and shot volume.

#Step3 - Cooling

It is the phase when the plastic inside the mold begins to cool down and starts taking the desired shape. It is only after the cooling, the mold opens. From the wall thickness of the product and its thermodynamic properties, you can judge the cooling time.

#Step4 - Ejection

The last step in injection molding is ejection. A force is needed to push the part when the mold opens. It takes a great force as the part shrinks and sticks to the mold. The mold then shuts again with clamping and is ready for another shot.


AMTEC offers certified programs in injection molding under its plastic engineering courses. We aim to impart practical knowledge of plastic engineering to make you ready for a career in plastics.

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