I'm not sure what you mean about fabric rippling.
If I have a wrinkled fabric, I either iron it with steam or spray with water until slightly damp and iron with a dry iron. For very difficult wrinkles (such as the fold from a bolt) a light spray with vinegar works pretty well. Since the fabric has not been washed, there will still be sizing agents in the fabric that respond quickly to water.
If you are having a hard time getting wrinkles out of unwashed fabric, I have to wonder if your iron is getting hot enough.