Plastic injection, also called plastic moulding is a process involving thermoplastic. It consists in shaping a piece of plastic by first heating the material and then soften it before injecting it into a mould with a press. Finally, the component is cooled down.
Here is a schematic of an injection moulding machine:
1. fixed backboard
2. guidance pillar
3. mobile closing board
4. fixed injection board
5. heating injection roller
7. injection group
8. closing part
11. hydraulic group
Several characteristics are fundamental for an injection moulding machine:
– the closing power: mainly given in tons, it has a direct impact on the injection volume and weight.
– the opening path: represents the maximum length of the injectable material.
– the path between pillars: represents the maximum width of injectable material.
– the screw diameter: during the plastification phase, it is the screw that while turning will melt down and blend in the plastic parts placed in the nozzle. During the injection phase, the screw will blocked the material injected in the mould.
– the injection pressure
– the injection volume
– the injectable weight
You can find any kind of used injection moulding machine from 30 tons to 1300 tons on the marketplace for used machines Exapro.
If you are interested in a specific brand you can browse machines available from Arburg, Battenfield, Billion, Demag, Engel, Ferromatik, KraussMaffei, NegriBossi, Netstal, Sandretto.