Content - Injection moulding

Injection moulding

Injection moulding

Injection moulding in highest precision:

The raw material

The initial material for the manufacture of plastic containers is the granulate. These are small plastic pellets to which colour is often added. The granulate is stored in large silos. From there it goes through feeder pipes to the moulding machine.

The machine

An essential component of the machine is a cylinder, inside which moves a «corkscrew thread». In it the granules are transported to a nozzle in front of which the moulding tool is clamped into the machine. On the way in, the small plastic pellets are heated, ground up and mixed, giving a viscous compound.

The production

Two plungers press the halves of the mould together and the liquid plastic can be injected into the cavities of the moulding tool. The tool then opens, the finished container is taken out and the whole process is repeated "shot after shot".

The background conditions

A moulding tool is manufactured from high grade steel and this takes a lot of work. The machine requires enormous closing force to hold the halves of the tool together. These are all components which, like the raw material, the colour and "cycle time» or the set up time when installing the tool, have a part in determining the price of the end product.


  1. Injection process prepared
    Tool open, granulate stocked.
  2. Injection process starts
    Tool closed, granulate proceeds into the spiral.
  3. Injection process
    Tool closed, granulate heated and as a viscous plastic material injected through a jet into the cavities of the tool.
  4. Injection process completed
    Container cools off.
  5. Injection process finished
    Tool moves apart, container removed via robot.