Step 1: Choose the size of screen you wish to make.
unprinted tyvek might be better for rear projection.
Step 2: Obtain a roll of TYVEK house wrap to your size requirements.
Step 3: Choose a pipe a little wider than your screen
Note the printed size is face down on dirty floor. Buttered side up !
Step 4: Tape the end of the TYVEK to the steel bar.
Step 5: Weight the hanging end.
I have been using packing tape. Works a treat for this application though TYVEK tape might also be good (let me know)