OK. Just made 3 Plyban cylindars on the impulse sealer. WOW, this was really easy and worked like a charm. I cut the Plyban to the correct size, overlapped the edges, and sealed. With a couple of adjustments, this would also be very easy do do on a FoodSaver. The advantage of the impulse sealer is that it is open on one end. All I have to do now is sew on a round bottom and I have a Plyban hoop bag. I don't know what a Kadova looks like, but this technique has some real possibilities.
Pic 1 - Ready to seal on the impulse sealer
Pic 2 - The finished cylindar
Pic 3 - Closeup of the heat sealed seam.