As others have said, once cut, handle as little as possible.
I use numbered paper plates with the block numbers written on the bottom. I stack the plates on top of one another & then put in either plastic Ziplock or fabric bags (the fabric bags sheet sets come in work great).
You could always soak them in liquid starch solution, but I seem to do fine with just heavy spray starch. Also, on rare occasions, I will pink the edges. They even sell 45mm pinking blades for rotary cutters.