Clamping

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Injection :

Plastic pellets are fed by means of a hopper into the injection moulding machine. These pellets move towards the mould by the injection unit. The heat surrounding the barrel and the pressure serve to melt the pellets. The volume of material injected is called the ‘shot’. This injection time finished when 95%-99% or the mould is filled. It is hard to calculate exactly the injection time because the flow of the plastic is always changing and dynamic. Injection time can be estimated by other factors such as injection pressure,power and shot volume. The injection pressure can range from 35-140 MPa. The rate of injection and the pressure which can be reached are determined and controlled by the hydraulic system in the machine.