Answer:
The Danner process is used to make glass tubes
Step-by-step explanation:
In this process the molten glass passes from the feeder to a hollow ceramic cylinder that is tilted downward, so that the molten glass can "run"; This ceramic cylinder is spinning constantly.
As the molten glass passes through the Danner tube, compressed air is blown to prevent the glass from being damaged. On the opposite side of the feeder, i.e, on the other side of the tube a bubble is also formed so-called drawing onion, the glass tube is removed in a free buckling in a traction line from the onion.
When the stretching speed remains constant and an increase in the blowing pressure occurs, larger tube diameters are created and the wall thickness decreases.
This process allows tube diameters between 2 and 60 mm.
This is how glass bottles are made.