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What Is Injection Moulding And How Does Injection Moulding Work?

What is Injection Moulding Process ?


Injection Molding is a manufacturing process which producing huge volume of parts.. It is a fast process and is typically used in mass-production processes where the same part is being created thousands or even millions of times in succession..It’s one of the most popular and efficient manufacturing processes.


With the help of Injection mouldings we can produce many type of products from micro parts to large components such as car bumpers and wheelie bins. Virtually all sectors of manufacturing use injection moulded parts. The flexibility in size and shape possible through use of this process has consistently extended the boundaries of design in plastics and enabled significant replacement of traditional materials thanks to light weight and design freedom.


How  Does Injection Moulding Work? 

First step of in the injection moulding process is the development of a mould that will form the liquid plastic into the required shape.Once the mould has been created and thoroughly tested, it is ready to begin creating components.


Most thermoplastics can be processed by injection moulding; the most common materials used include:

  • Acrylonitrile-Butadiene-Styrene ABS
  • Nylon PA
  • Polycarbonate PC
  • Polypropylene PP\

The injection unit takes plastic raw material granules, heats them until molten, into a liquid which is then guided through a nozzle of the injection moulding machine into the cavity of the mould which fills with liquid plastic, taking on its shape.This molten plastic cools rapidly and becomes solid after only a few seconds. The mould tool is mounted on a moveable platen – when the part has solidified, the platen opens and the part is ejected out using ejector pins.


This needs accurate control as different polymers have different melt temperatures, if the temperature is too low for the particular polymer then not all the material will melt. This will result in unmelted pieces of plastic being in the moulding affecting performance and appearance. 
 By Setting too much high temperatures could result in the plastic degrading leading to poor appearance and reduced performance. The amount of time that the material resides in the barrel can also lead to degradation so weight of the part and cycle time become important factors.

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