Epson 4500 - Manual (Page 146)

The Cut Sheet Feeder
5. Take a stack of paper and fan it as shown. This keeps the paper
from sticking and ensures that only one sheet feeds at a time. Tap
the side and bottom of the paper on a flat surface to even the stack.
Note: For best results, use typewriter quality paper. If you plan to
use paper with a glossy or textured surface, test it before using it to
print documents. Do not use multi-part forms, carbon paper,
envelopes, or labels in the cut sheet feeder.
5-8 Using the Printer Options