This a method we devised to make a screen.
Using Speedframe 25mm square tubing from Dexion.
http://www.dexion-anglia.co.uk/shelving.html
Cut the tubing to size and use four L shaped Speedframe connectors to join the lengths together.
Put hook velcro along the steel tube on one side completely covering it. Use a seam roller to make sure the velcro sticks.
Cut the screen material to size and put loop velcro all the way round it's edge.
Attach the material to the frame. If there are any creases just peel the velcro off in that area, pull tight and plonk it back on. The velcro and tube is 25mm wide so you have 50mm of play for adjusting the tension on the material.
The whole thing can be taken apart and stored if need be.