Production Injection Molder

So I came across this video today:

 

 

It shows how a production injection molding machine works and the history of the older styles of injection molding machines like out hand operated machine.

 

The present commercial machine uses the compression screw like the injection molder, then the screw itself is moved forward like a piston to inject plastic.

 

What instead if the extrusion machine filled a chamber with molten plastic and then a separate piston injected the plastic?  this would greatly simplify the process and enable a much lower cost production machine.

 

That’s called two stage injection and there is a system known as ‘v-line’, this is often used on small machines.

here a nice play list : https://www.youtube.com/watch?v=b1U9W4iNDiQ&list=PLQSShGGKdgS45HUzg9Eenrzc_ayziChyi

yeah, i was also thinking how to extend the extrusion for that, it shouldn’t be too hard as i figured after some drawing sessions but at the end I’ve decided to try my luck on something more small first : https://www.youtube.com/watch?v=zTjbs3Hg2PA in hope i gain enough knowledge for bigger things …