Check out this video that demonstrates our manufacturing process and how we make rubber doorstops:
This was from a documentary made in 1993 called ”Off the Ground & Off the Wall: A Doorstop Documentary.”
We don’t actually compound the material here – we have the material compounded for us.
The rubber is originally in strip form and is fed into the screw of the machine and injected into the mold under high pressure. It is then unloaded by the operator who pulls off the excessive flash.
The next step is a cryogenic finishing machine – a shop blaster. Using liquid nitrogen, we take the temperature down to about -80°F. The principle behind this is not to freeze the part, but to freeze the flash (the excess material on the bottom). By freezing the flash, the little pellets that hit it in the shop blaster act like sandpaper. The sandpaper takes off the flash line all the way around the doorstop
Then from there it goes on to our finishing department where we sort and box.
That’s it!
“Off the Ground & Off the Wall: A Doorstop Documentary”
A Film by Gary Roma
Iron Frog Productions
Copyright 1993 Gary Roma
