Xerox DocuPrint 4850 NPS System Overview Manual page 46

PAPER AND OTHER SUPPLIES
Conditioning paper
A-4
Figure A-2. Recommended temperature and humidity for paper
storage
Because temperature and humidity affect paper performance in the
printer, you need to condition paper before using it. To do this, store
paper for a specified length of time in the same type of environment
as your printer.
The length of time you should condition your paper depends on the
amount of paper and the difference between the storage and
operating temperatures.
XEROX DOCUPRINT 4850/4890 NPS SYSTEM OVERVIEW GUIDE