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Plastic Injection Moulding


Injection Moulding– IM works by plastic resin from a hopper being heated and then forced into a mould under high pressure. The mould itself can be created from many different types of materials and can make many thousands of parts, depending on its composition. Many parts from many different materials can be made, with an excellent surface finish and high durability. The cost of the tool can be quite high initially and so prototypes may be produced by other methods prior to commencing the actual production run using injection moulding.


 




Injection moulding itself has multiple advantages over other processes, such as a high production

rate in a short production cycle, multiple design capabilities and low per part cost.

 

Injection moulding creates finished parts, mainly consisting of a resin-type material, by forcing

molten plastic into a mould, which is then left to cool and harden. The parts produced can be 

virtually any size, although it is most commonly used for producing large quantities of mass 

produced items such as plastic bottles or parts for the automotive industry, amongst many others.

 

Besides, injection moulding produces parts that are light weight, impact and corrosion 

resistant at a very low cost, with very little change in the cost of the raw materials.


The benefits of injection moulding have gained in popularity over the years because of the

advantages it offers over traditional die casting manufacturing methods. Namely, the immense

amount and variety of low cost, affordable products that are made from plastics today are virtually

limitless. There are also minimal finishing requirements. This being the case, it is going to be

dependent on the engineer and customer to decide which type is more suitable for their particular

requirements before they commence manufacture, notwithstanding the cost, quality and use of the

final part.


Injection Moulding Quality Control Applications


The injection moulding process is now so advanced that it is easily possible to make extremely 

complex parts of high quality. Many of these parts are safety critical and must be able to be inspected 

to ensure their strength and durability, as well as their general quality in relation to company quality 

control standards. Due to the small margins of tolerance for such manufacturing processes, optical 

measurement is often the only possible way to check such parts. Each item that is checked is 

compared to a known, measured value, which is then compared to the original CAD file in the

database to check the required value.


There is not only a requirement to check the accuracy of the final product, but also the calibration 

of the injection moulding equipment itself, prior to every production run. Small tolerances can become 

out of sync after the production of multiple parts, solely due to the vibration and movement of the 

machine itself, as well as general wear and tear – especially as a result of shorter production times. 

Checking the tolerances and condition of the machine prior to production reduces wastage and allows 

any maintenance to be conducted in a systematic fashion, without reducing product quality or speed. 



At NICE Rapid, we are experts in all types of injection moulding. Please contact us to discuss your 

next project today!



 
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