How to make a capacitor

SHENZHEN LIRON ELECTRONICS CO.LTD.
We draw our capacitors at random to do capacitor gas tightness testing from our production line so that all of our products quality are good.
Automatic Winding, welding, impregnation and assembly process of aluminum electrolytic capacitors
How to make a capacitor1
How to make a capacitor2
https://youtu.be/xDm2rvvO0YY

How we test our capacitors.