Assuming we are talking about medium format film:
What I always do to avoid curling is twist back the first bit (about 1 cm) of the film, so it sort of 'uncurls'. It works fine, because the film winds onto the reel perfectly. I have never had any problems with scratching.
Also, I never use a squeegee on 120 rolls, but just soak them in demineralised water with a few drops of wetting agent before hanging them up to dry.