Injection Molding Parts

Clamping – Securing the Mould
The first step in the plastic injection moulding process is clamping. A clamping unit closes and holds the two halves of the mould tool tightly together, keeping it shut against the high pressures produced in the mould when plastic is injected.

Injection – Filling the Mould with Molten Plastic
Plastic granules are fed into a hopper above the moulding machine. As these move down from the hopper into the barrel below, rotating screw transfers the pellets to the forward heated part of the barrel.
A hydraulic ram injects the molten plastic into the mould tool under very high pressure, ensuring that it fills up the entirety of the cavity, creating a detailed and accurate representation of the desired part.

Cooling – Allowing the Plastic to Set
After the molten plastic has been injected into the mould, it needs time to cool and solidify. The cooling stage allows the plastic to set into its final shape.
The cooling time can vary depending on factors such as the type of plastic used, the wall thickness of the moulded part, and the presence of cooling channels within the mould tool.

Ejection – Removing the Moulded Part
Once the plastic has cooled and solidified, it's time to remove the newly moulded part from the tool. This is known as the ejection step.
There are several methods for ejecting the part, including pins, blades, bars, sleeves, or lifters. The most common approach is to use ejector pins strategically placed within the mould tool to push the part out once it has cooled.

Inspection – Ensuring Quality Control
The final step in the plastic injection moulding process is inspection.
After the moulded part has been ejected, it undergoes a quality control check to ensure it meets the required specifications and standards.