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Plastic Injection Moulding – Methods


Looking to manufacture precision parts for the medical, defence, auto or any other industry?

The means is certainly to leverage the technology of plastic injection moulding to get there.

This method is seen favourably by experts because of the flexibility that it offers. Injection moulding involves injecting molten material into a mould. As the molten material solidifies it takes the shape of the interiors of the mould.

The injection moulding machines (presses) come in variety of capacities as well as different pressures or tonnages – for medical applications it is the smaller presses that do the job and for bigger applications like for aircrafts, defence, auto bigger presses kick in. Areas of application of injection moulding is broader since it allows the use of plastic resins/additives.

PLASTIC INJECTION MOULDING serves many industries. Prominent ones are the following:

  • Engineering Prototypes
  • Automotive Components
  • Product Design & Development
  • Medical & Dental Products

Here are the new injection moulding techniques practiced my plastic product/part manufacturers world-wide.

GAS ASSISSTED INJECTION MOULDING: Pressurised gas (mostly nitrogen) is injected along with the molten material. The gas builds up bubbles that push the molten material to deeper areas of the mould. This gas is either pushed via a nozzle or into the mould directly.

FOAM INJECTION MOULDING: This is an efficient method and a cost-effective one at that. Manufacturer achieve (1) high resistance (2) superior thermal isolation, (3) better chemical resistance and (40 higher electric and acoustic schemes. A foam core between two layers is created by dissolving an inert gas. When the molten material is poured into the mould the core expands.

THIN WALL INJECTION MOULDING: As the name suggests this method is used  to manufacture objects that require thin walls. These ‘thin walls’ are normally under a millimetre in thickness. This is a very highly specialized method of producing moulded items that are light, structurally as strong as when manufactured by any other method, is cost-wise cheaper and consume shorter cycle time.

 MULTI-COMPPONENT INJECTION MOULDING: Also known by its variants two-shot moulding, co-injection, and hard-soft moulding, this method brings materials or dyes of different characteristics together to build plastic products of high strengths/durability. The manufacture can work on the product design with lot more flexibility in this method.


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CATEGORY: Manufacturing, Plastics

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